Download US Only Apps To Your Android - No Root Required

A few weeks ago, I taught you how to download region-specific apps (such as US only) to your Android. That particular method involves rooting your phone and losing your warranty. Today I'm going to teach you how to do the same without rooting your phone.

That's right.

You can download regional applications straight to your Android without the risk of bricking it or losing your warranty.

Now this is something I discovered by accident. Thus, I can't guarantee it works for all area-specific applications. However, it's worth a try. Anyway, it's very easy to do. Whether or not it works for you I would love to hear your feedback on the comments below!

Prerequisites

• Android 2.1 and higher

HOW TO ACCESS US-ONLY (AND OTHER AREA-SPECIFIC) APPS ON YOUR ANDROID

Step 1: Download AppBrain App Market from Google Play (free)

Step 2: Launch AppBrain

Go through the start-up process. No need to sign up but it's up to you, really.

Step 3: On AppBrain, search for an area-specific application

A good example is Blogger for Android which is limited to specific regions like the US and UK.

Step 4: Select the app you are looking for

Click "Install".

You will be redirected to Google Play only this time, you now have access to the regional app.

Step 5: Click "Install" or purchase the app if it's paid

Then, wait for the app to finish downloading.

I know this worked on me because if I search for Blogger on Google Play Store, the app doesn't show. It only appears when using the AppBrain App Market. If this technique doesn't work for you, you can always try Market Enabler. But as previously mentioned it needs a rooted device. Dowloading from third-party app markets is no longer an option these days. Haven't you heard? They got nabbed by NBI.

Dead Trigger Survival Tips: Bloody Subway Arena Walkthrough (v1.5.1 ONLY)

Only works for v1.5.1 :-) If you have v1.5.0 and lower versions of Dead Trigger, please refer to this Bloody Subway cheat guide.

The recent update (v1.5.1) for Dead Trigger fixes the bugs detailed in the Bloody Subway cheat guide that took me some time to perfect. This time, I can't guarantee you're going to survive for more than 50 waves - unless you're that good. I did come up with new survival tips so you can last longer than usual.

Disclaimer: How long you actually survive depends on your character level, character upgrades, weapons, and skills at evading those f*cking zombies.

I do apologize for the poor quality of my photos because Screenshot ER Ultra isn't allowing me to save screenshots in JPEG format :-( But if you want to survive for longer, I suggest you read everything so that you will understand the summarized survival tips at the end of this post.

CHARACTER, WEAPONS, AND ITEMS

You need to be at least Rank 13 to get the following recommended character upgrades, weapons, and items.

Character

• 2-3 weapon slots
• 3-4 item slots

Aside from these, the following character upgrades are also recommended for the Bloody Subway Arena. It is entirely up to you which ones you will get but I arranged them based on importance from top (most important) to bottom (least important).

• Improved Radar (39G)
• Additional Health (99G at Rank 1 AND/OR $5000 at Rank 8)
• Ammo Supply (99G at Rank 1 AND/OR $30000 at Rank 10)

Weapons

You can use the following weapons depending on the slots you have. To survive longer, do upgrade these recommended weapons to increase their damage, accuracy, range, and clips. 

For those who have 2 weapon slots...

• Slot 1: Minigun OR Bren for regular zombies and bosses.
• Slot 2: Brain-mill OR Chainsaw for killing SWAT zombies.

For those with 3 weapon slots...

• Slot 1: Minigun OR Bren
• Slot 2: KSG OR RMGT 870 OR any weapon of your choice for shooting zombies while running around. When you reach Rank 15, you can upgrade to Striker because it is the only shotgun with the most clips. Ideally, you should have a high-damage medium-range weapon so you can easily kill zombies the moment you cross them.
• Slot 3: Brain-mill OR Chainsaw

For those with 4 weapon slots...

• Slot 1: Minigun OR Bren
• Slot 2: Bren (if you have Minigun) OR Lewis OR any weapon of your choice. For this slot, it is best that you place any high-range weapon with a high number of clips. It will serve as your alternative to the weapon on Slot 1 in case you run out of ammo.
• Slot 3: KSG OR RMGT 870 OR Striker (for Rank 15 only)
• Slot 4: Brain-mill OR Chainsaw.

Items

I highly recommend that you get a Speed Booster which costs 399G at Rank 1. Speed is the most important aspect of survival in the Bloody Arena. So work hard by playing Daily Rewards and take your chance at the Casino. If you can't get a Speed Booster, it's okay! I provided alternatives below :-)

Have 2 item slots?

• Slot 1: Speed Booster OR 2 Revive Kits
• Slot 2: 2 Medkits OR 5 Bandages

Have 3 item slots?

• Slot 1: 2 Medkits
• Slot 2: Speed Booster OR Slow Time. Slow Time will give you allowance to get either Additional Health or Ammo Refill without being chased around by zombies.
• Slot 3: 2 Revive Kits OR 5 Bandages

Have 4 item slots?

• Slot 1: 2 Medkits
• Slot 2: Speed Booster OR Slow Time
• Slot 3: 2 Revive Kits
• Slot 4: 5 Bandages

BLOODY SUBWAY SURVIVAL GUIDE

The "Safe Zone" And Some Zombie-Killing Tips

Upon entering the Bloody Subway Arena, turn to your right and run!

See that gate over there? Unlock it and climb the staircase.

This will be your "safe zone" or the place where you're staying most of the time. Zombies will be coming from two sides - your left and right.

Zombies to your right must be shot dead on the spot using your weapon from Slot 1.

Zombies from the left staircase can either be shot in the leg or killed on the spot. If you have an Improved Radar, this will come in handy. Now look at your radar. If there are NO zombies to your right, kill the zombie(s) on the bottom of the staircase.

But if there are zombies to your right, just dismember them by shooting them in the legs. This will buy you enough time to kill zombies on your right and change ammo clips by the time the staircase zombies reach the top.

When surrounded by hoards of zombies at the safe zone, RUN! After running, you can deal with the zombies in different ways. Whichever strategy you take, remember that zombies will be following you around even if you ran in circles. So the trick is to lose them or have them chasing after you from a single direction.

What do I do when I'm surrounded by zombies?

You can run downstairs (granted there are no zombies waiting at the bottom) and just shoot them from there. If they come too close, run upstairs again towards the safe zone and shoot them.

When you see zombies coming from all directions, run down the safe zone staircase and outside towards the lobby. Avoid zombies you encounter so they don't hit you. Then climb up one of the two staircases in the lobby and run back towards the safe zone from the second floor. By doing this, most zombies will be entering the safe zone from one direction - the doorway on the right. 

Tips: While running around, shoot a few zombies using a Striker. You can use any shotgun or high-damage medium-range weapon. Also, reload your primary weapon while running so when you reach the safe zone, you can get back to killing zombies.

Reloading Your Weapon

Reloading your weapon at the wrong time is bad for survival. In fact, you may die out of it.

When do I reload my primary weapon?

1. When there are no zombies around. Use your radar or plain sight to detect nearby zombies. Don't wait for your ammunition to run out before changing clips.
2. While running around. Whether you are trying to avoid zombies or shaking off an entire hoard, save time and your life by reloading.

Ammo Refill, Additional Health, and Power-Ups

Ammo Refill, Additional Health, and Power-Ups are available at all Dead Trigger Arenas. These areas need a few hundred dollars to unlock but definitely worth-it.

Where can I find Ammo Refill? At the safe zone; particularly the wall on the back.

When do I buy Ammo Refills?

1. At the end of each wave.
2. If you ran out of ammo and still have a few zombies to slay.

Ammo Refill at Bloody Subway safe zone

Where can I find Power-Ups? On the room opposite to the safe zone on the second floor. You have to unlock this area using money.

When do I get Power-Ups? See the "Power-Ups Guide" below for a detailed explanation.

Bloody Subway Power-Ups Area

Where can I get Additional Health? On the ground floor, in between the two staircases of the lobby. The cost for refilling your health is around $100 to $1000 depending on how much you need.

When do I get Additional Health? When down to your last 1-2 zombies during a wave and you realize you need life, shoot off their legs and run to get Additional Health.

See the yellow arrow below? That's how you check for the last 1-2 zombies of the wave.

Below is an example of me running for life. Oh no, only 9 seconds left! Make sure that by that time, you are already on your way back to the safe zone!

Now let's talk about Power-Ups and how they can help you defeat bosses.

Power-Ups Guide

You can only buy (1) Power-Up after every 2 waves. So if you buy a Power-Up during Wave 1, you can't buy another one until Wave 3. Each Power-Up lasts throughout a wave. So if you buy one at the start of Wave 1, it will expire once you finish the wave. The Power-Up alternates between Head-Flator and Damage Booster. The first available Power-Up is always a Head-Flator followed by Damage Booster, Head-Flator, and so on.

When do I get a Power-Up? Here's a step-by-step guide to help you understand how it works...

1. When you are down to the last 1-2 zombies of Wave 1, I want you to shoot off their legs and run towards the Power-Ups Area. Unlock it.
2. Enter the caged room and stay there until the crawling zombies come near you. If they do, kill them to end the wave. If they die on their way to you, the wave will automatically end.
3. When the wave ends, get the Head-Flator Power-Up before the countdown begins and run back to the safe zone. Then, refill your ammo.
4. During Wave 4, repeat step 1-3. This time, you will be getting a Damage Booster and prepare for Wave 5. Run towards the safe zone and buy an Ammo Refill.

The steps described above is a cycle you should stick to for killing zombie bosses.

Killing The Boss

Boss Waves occur at Waves of 5 - Wave 5, 10, 15, 20, etc. To kill the boss, you need to:

1. Get the Damage Booster Power-Up during boss waves.
2. Get the Head-Flator 2-3 waves before boss waves. This will ensure the availability of the Damage Booster during boss levels.
3. Find his "soft spot".

The "soft spot" is a sensitive body part of the boss. When you hit it, he will tilt his head. If you don't, he will just stand there and do nothing then run towards you. To find his soft spot:

1. Shoot the boss at different parts of his body. My personal favorite is his neck but sometimes, he gets hurt when you shoot him in the stomach and feet.
2. If the boss doesn't tilt his head after shooting him at different parts, WASTE NO TIME. Run and reload your ammo. Once he chases after you, try shooting him again at different body parts and as soon as he tilts his head and flails his arms, CONTINUOUSLY SHOOT HIM IN THE HEAD.
3. If the boss tilts his head in your first attempt, aim at his head and continuously shoot at it til he dies.
4. If you run out of ammo and the boss is still alive, repeat steps 1-3 until he dies.

Below is an example of a boss you SHOULDN'T continue shooting in the head. See how he's just standing around? It means your bullets aren't hurting him.

AVOID THE GREEN SPIT OF THE BOSS AT ALL COSTS. It will limit your vision and prevent you from seeing clearly. You can do this by sidestepping to your left or right the moment he spits at you.

After killing the boss, time will slow down as he falls to the ground. Take this opportunity to:

1. Reload your weapon.
2. Get Ammo Refill if you ran out.
3. Kill other nearby zombies.

I killed the boss yay!

Congrats on killing the first boss for the wave. That's right. There's likely second boss coming at you before the wave ends. So if don't have at least at least 150 bullets on your primary weapon, get an Ammo Refill at the safe zone. Now go get him.

Tip: Don't forget to refill your ammo once again after the wave ends!

And now, a revised version of my survival tips for the Bloody Subway!

SUMMARY: BLOODY SUBWAY ARENA SURVIVAL TIPS

1. Use a shotgun when running outside of the safe zone. You can also use any high-damage medium-range weapon of your choice. Shoot the zombies closest to you and avoid the the rest until you get back to the safe zone.
2. Don't run for petty cash during waves. Unless you are absolutely sure there are no zombies around (and the cash is really, really close to you), don't go for it! You will be paid thousands of dollars if you survive a wave :-) The higher the wave, the greater your rewards will be.
3. Only use your bandages or medkits during emergencies. Anyway, you can run for Additional Health in between waves. BTW, never use them while surrounded by zombies because you will just lose the life you gained.
4. Use your Revive Kits sparingly. If you are surrounded by a swarm of zombies or confronted by the boss zombie and got nowhere to run, let yourself be killed and the Revive Kit will kill those bastards.
5. If you can run, then run! One thing I learned from The Walking Dead is that those f*ckers are stupid and you can avoid them. Running around the Bloody Subway is really great for losing zombies. You should also run the moment you're surrounded to avoid extensive damage.
6. At the safe zone, kill all zombies to your right.
7. At the safe zone, dismember OR kill zombies coming from the left stairway. Only dismember if there are zombies approaching from your right. Kill the stairway zombies when there are none to your right.
8. Shoot in the head. Yep. There's no better way to kill them. Carnages are awesome but they are a waste of ammunition.
9. Use Minigun or Bren for killing regular zombies and bosses. But you can also use any high-range weapon with high number of clips as your primary weapon.
10. Use a chainsaw or Brain-Mill for killing the SWAT zombie. There's no faster way to kill them.
11. Look at the radar. Check on it regularly to see if it's safe to refill your ammo or reload.
12. Only use the Damage Booster during boss levels.
13. Get the Head-Flator 2-3 waves before the boss level.
14. Use Slow Time in extreme emergencies. Example: If you have a low life but already ran out of bandages, Medkits, and Revive Kits.
15. Practice. It takes time to get used to this routine. You might not get it at first but you will eventually. So keep practicing until you get your rhythm.

Abyss Kernel Tweaking Guide (ICS Kernel for SGS2)

I've been on Abyss Kernel for the past week (at least, back when I prepared this post) and I'm really impressed with its stability, battery life, and performance. In this post, I will teach you how to tweak your device settings using Abyss Kernel. I'm only going to cover what I believe are its most important tweaks for battery and performance.

Version reviewed in this post: Abyss Kernel v1.2 (latest)
Build date: May 18, 2012
Compatibility: Samsung, MIUI, AOSP, and AOKP ROMs
Developer: angelom
Download link: See List of SGS2 Kernels (ICS)

Features

• Abyss CWM Recovery
• Set screen brightness to lowest possible level (lower than stock Samsung firmware)
• Adjust voltage of CPU
• Change GPU frequencies
• Change value of charge current
• Adjust touch sensitivity
• Adjust gamma levels

Whoaaah. Let's slow down for a bit.

How to adjust screen brightness

Now the screen brightness, you can adjust directly on your phone. Just press and hold on the Status Bar and slide your finger across. There you go!

How to adjust CPU speed

NOTE: Underclock and overclock is possible.

You can also adjust the CPU speed using AnTuTu CPU Master Free or SetCPU available at Google Play. The CPU can be set from 200 to 1600 MHz (1.6 GHz) using either of these apps. These apps also allow you to select kernel governors like "ondemand," "performance," and "powersave". Basically, they are presets for CPU clockspeed. Each preset can affect the performance of your SGS2 as well as its battery life. To find out more about these Governor Tweaks, please refer to this amazing thread on XDA. Don't read too much though. It's going to give you a headache if you're an average user like me :)

One thing you may notice different is the "abyssplug" governor. This is a unique hotplug governor to Abyss Kernel. More about hotplug when you read along.

Abyss Kernel Tweaks

The Abyss Kernel has its own touch-based CWM Recovery. It has the functionality of CWM Recovery and more. With it, you can access the following under "ABYSS Menu" for tweaking.

1. Abyss ASV Table Menu
2. Install Abyss Script
3. Delete Abyss Script
4. Create Backup EFS
5. Clear init.d folder
6. Tweaks Service Menu
7. Advanced Abyss Menu
8. Abyss ASV Bus Table Menu

Sorry, but I can't give information about all of them. However, I can teach you how to tweak the most important settings which I highlighted in bold. These tweaks can optimize the battery life and performance of your SGS2.

Abyss ASV Table Menu

This enables you to adjust the voltage or amount of battery power your SGS2 consumes on a given clockspeed/frequency. Low voltage equals good battery life. Under this setting, you can choose from eight (8) options ranging from ASV Table 0 to ASV 7. I'm going to spare you from the headache and tell you this:

"The higher the number, the better its power efficiency."

I haven't really this theory but judging by the voltages from this XDA thread, ASV Table 7 is the most power efficient whereas ASV Table 0 is the least power efficient. The default ASV Table for Abyss Kernel is 3. The voltages of ASV Table 3 are lower than the original setting of the SGS2 which explains why Abyss has an impressive battery life.

There's an additional option under Abyss ASV Table Menu that says "Don't use ASV TABLE (for script)". I don't know anything about scripts so I didn't select this.

Tweaks Service Menu

• Enable sched_mc power savings - Better battery life, less performance
• Disable sched_mc power saving - Better performance, less battery life
• IDLE Mode Menu (affects the idle mode of your SGS2)
• IDLE Enable - Normal idle. Least battery efficient but phone wakes easily. Clockspeed is 0 but CPU still draws power, resulting in battery drain even when idle.
• AFTR Enable - Deep idle. More battery efficient but phone takes time to wake. Clockspeed is 0 and CPU power is killed. The phone will rely on L2 cache power to wake. The battery barely drains during Idle Mode in this setting.
• IDLE + LPA Enable - Similar to IDLE Enable but L2 cache power is removed. Thus, it provides better battery efficiency than IDLE Enable.
• AFTR + LPA Enable - Similar to AFTR Enable but L2 cache power is removed. This is the most battery efficient IDLE Mode. 
• Restore default - restores the default IDLE Mode for Abyss Kernel.
• Enable EXT4 Boost - Increases disk performance
• Disable EXT4 Boost - Normal disk performance
• Enable BLN - Enables back light notifications. The capacitive buttons of your SGS2 will light up for notifications when your phone is idle. Promotes battery efficiency.
• Disable BLN - Disables back light notifications. Your entire screen will light up for notifications. 

Advanced Abyss Menu

• Second Core Menu
• Hotplug on - TBH (To be honest), I don't know how it works but this is the best option under this menu if you want your SGS2 to have a balanced battery life and performance. Abyss Kernel has its own hotplug called "abyssplug"
• 2 core always off - Switches to single-core power. Offers great battery life but compensates performance of your supposed-to-be dual-core SGS2. I believe this will heavily impact 3D games. BTW add me on Dead Trigger "shetalksandroid" lol.
• 2 core always on - Forces 2 cores to run. Always. Even on idle mode. Offers great performance but obviously drains battery fast.
• Vibration Level Menu - Select from Level 0 to 6 where "Level 6" is the strongest vibration intensity. Choose Level 1 to help save battery.

ASV Bus Table Menu

Bus speed determines the speed of data transfer. Between ASV Bus Table 0 to 6, 0 is the slowest and 6 is the fastest. I did some benchmarks using CF-Bench while on default ASV Bus Table (which is unknown) and ASV Bus Table 6. Under Bus Table 6, many values increased including the Overall Score. The phone does heat up for no reason when set to ASV Bus Table 6 so I would suggest experimenting with lower values. Or, you can always select "Default ASV Bus Table."

Final word...

Well, I hope I helped you learn some things with this post. This has really been a great experience for me. Okay, at first it gave me a headache (and many things still do!) but at least I learned new stuff. I plan to test more kernels on my SGS2 and invest on benchmark tools. For consistency, I will only use stock XXLPX firmware to test these kernels.

Dead Trigger Cheats: Bloody Subway Arena Survival Guide (v1.5.0 ONLY)

This only works on v1.5.0 and lower versions of Dead Trigger :-) If you have updated to v1.5.1 please refer to this new Bloody Subway Survival Guide.

UPDATE 08/25 Madfinger obviously read my blog and decided to fix the bugs exploited in this survival guide. To top it off, they even added an zombie entryway in the "safe zone" discussed in this post. MY ADVICE: Don't update to v1.5.1. But if you have Titanium Backup (Android only), just uninstall the app and restore v1.5.0 like me :-)

Old post starts here***

This really isn't a cheat - more like "an exploitation of a bug" that exists in the Bloody Subway Arena of Dead Trigger. If you stick to the tips I give you, you can survive the Bloody Subway for an indefinite** period.

** depends on your device's battery life LOL.

Moving on, I really tried to make a video tutorial using Screencast but my dual-core SGS2 couldn't handle it. Even tried overclocking my phone but it didn't work. So please be patient going through the screenshots and my tips :-)

So why should you bother surviving the arena anyway?

CASH. The maximum I got was $50,000 after surviving 55 waves. If you have cash, you can upgrade your character, buy weapons, and have better chances of surviving longer in the arena. And if you have greater chances at surviving, you get to have more money! The recent update should get you even more cash since you will be rewarded after winning boss levels.

EXPERIENCE. When I need to level up, I don't play missions. I play the Bloody Subway Arena. Why? Because the patterns are easier to exploit. I went from Level 28 to 30 after 55 waves.

Character

If you have enough money (or willing to spend on some IAP), the following character upgrades will do. Then again, you can always get extra cash and gold using the Casino and by playing special missions every day! The following character upgrades are arranged from the most important to least important.

• At least 2 weapon slots
• At least 2 item slots
• (Optional) 1 to 2 Additional Health - if you're not getting this you need to have a Speed Booster for Items.
• (Optional) Improved Radar

Items

The following item purchases are ranked from the most important to least important.

Have two item slots?

• 5 Bandages OR 2 Revive Kits depending on your level.
• Speed booster OR 2 Medkits. But speed is really more important in the Bloody Subway since you can grab Additional Health in the game :-)

Three item slots?

• 5 Bandages
• 2 Revive Kits OR 2 Medkits
• Speed booster OR Slow Time

Four item slots?

• 5 Bandages
• 2 Revive Kits
• 2 Medkits
• Speed booster OR Slow Time

Never use grenades by the way. If you are swarmed by zombies and decide to use a grenade, you will die. Also, grenades are not worth carrying around if you want to last long in the arena. I also feel the same way for all other items. They can help you survive early on but not in the later stages. That is why Slow Time is my second option to the Speed Booster but you can only use it in emergencies like running for your life or getting ammo when extremely needed.

Guns

I won't suggest specific guns because truthfully, I bought gold and cash using real money. However, I do recommend having long-range rifles or automatic weapons. Additionally, you also need at least one shot gun (for that nasty SWAT zombie). Trust me, you don't want to waste your precious ammo on a single SWAT zombie. However, I'm going to share the weapons I currently use:

• Slot 1: Minigun
• Slot 2: Bren
• Slot 3: Lewis
• Slot 4: Striker

And now, the survival guide!

Step-by-Step Survival Guide For Dead Trigger's Bloody Subway Arena

Step #1: Run like hell and go to the "safe zone."

As soon as you enter the Bloody Subway, don't just stand there and do nothing. Run like hell towards the staircase on your left. When you reach the caged room, come near it and unlock by selecting "Buy." This is your safe zone. Don't worry. You will get the lost cash later in the game.

Step #2: Stand by the caged door of the safe zone.

Zombies will come by waves of 30 in each level. However, all 30 zombies won't be swarming soon. They will come in 4 to 5 separate batches. In between these batches of zombies, stand by the caged door as preparation for Step 3.

Step #3: Dismember 3 to 4 zombies that come near you.

Using a long-range weapon or a minigun, shoot the zombies closest to you. SHOOT THEM IN ONE OR BOTH LEGS AND NOWHERE ELSE. You might want to prioritize running zombies that are closest to you. If possible, shoot them when they are a few feet from the entrance. The now-dismembered zombies will crawl towards you. Back up into the room. Crawling zombies are unable to enter.

... or any room with this platform for that matter. See photo below.

Shoot 3 to 4 zombies and make sure they are lined up across the entrance. In doing so, no other zombie (running, walking, boss, or SWAT) can enter the room!

Step #4: Shoot approaching zombies in the head.

Now that crawling zombies are lined across the entrance, come closer to the door - not too close though! Shoot approaching zombies using a long-range weapon. To conserve your ammo, it would be best to shoot them in the head.

If a SWAT zombie shows up, wait until it gets near and shoot at its face with a shotgun. It takes several shots to kill him.

Step #5: Shoot crawling zombies when new zombies stop appearing.

After shooting a couple of zombies from afar, you will notice that no new zombies are appearing on the radar. At this point, you have to shoot the crawling zombies blocking your entrance so that new zombies will appear.

Step #6: Repeat steps 2 to 5!

Just keep blocking the entrance with crawling zombies in each batch. If a crawling zombie dies, replace it with a new one to ensure that no zombie gets in.

The last zombies in a wave

During the last batch of zombies, DO NOT KILL THE CRAWLING ZOMBIES BLOCKING YOUR ENTRANCE. Otherwise, you will only have a 15-second window to run for ammo and get additional health if you lost any. 15 seconds is enough for just either of the two.

Running For Ammo And Health

I can make my ammo last for two waves but this is only because I have four weapons. If you have fewer guns, you need to constantly run for ammo.

WHERE do I find ammo? Youu can find it at the caged entrance across your new-found safe haven, second floor.

Ammunition is right across the safe zone.

Unlock this area to access Ammo Refill

The cost of ammo depends on how much you need.

HOW do I run for ammo? While zombies are blocking the entrance of your safe haven, switch to a shotgun and run towards the caged entrance across your safe haven. Select "Buy" to unlock the door and run towards the ammunition icon on the corner by the wall. Select "Buy" again.

Don't worry. The crawling zombies won't be able to reach you inside these caged rooms!

WHERE do I find health? At the room in between the two staircases, first floor. 

How do I run for health? If you lost a significant amount of life during a wave (and still have enough time), run downstairs and go back to where you started on the first floor. Go to the caged door in between the staircases, unlock, and "Buy" Additional Health from the icon.

The cost of health depends on the amount you need

WHEN do I run for ammo and health? You don't want to get hurt when running for ammo and health so it's best to run for them in between waves during the 15-second break and while being chased around by the crawling zombies you didn't kill.

By the way, after getting ammunition and/or health, don't bother killing the crawling zombies unless you have enough time. Remember, YOU NEED TO REACH THE SAFE HAVEN IN TIME FOR THE NEXT WAVE. Just run back towards the safe zone and the crawling zombies will die on their way to you :-)

I know what you're thinking...

Why can't I use my bandages, medkits, or just rely on my revive kits? Simple. BECAUSE YOU ONLY WANT TO USE THEM DURING EMERGENCIES. Remember, you want to survive waves and waves of zombies and not just the first few waves. 

Note: When buying ammunition or health, it takes some time before they refresh.

Power-Ups Guide: The Head-Flator and Damage Booster

Do you see the green icon inside of your safe haven? It alternates between a Head-Flator and Damage Booster. Those are called power-ups. I only use them in boss levels and I suggest you do to because they take much longer to refresh. Each power up lasts an entire wave so get them 3 to 5 seconds before the next wave. In the higher waves when bosses are more difficult to defeat, I suggest you get a Head-Flator TWO WAVES BEFORE THE BOSS LEVEL. That way, you can get the Damage Booster during a boss level.

Defeating The Boss

Boss levels are available in intervals of five. Wave 5, 10, 15, etc. are all boss levels. A maximum of two bosses appear in these levels but there was a time I got 3 bosses and I was like WTF?!?!

The boss doesn't appear right away. He only appears after a few couple zombies. I want you to do steps 2 to 4 of my step-by-step survival guide until he shows up.

And now... the f*cking boss.

The boss won't be able to enter your safe haven if crawling zombies are blocking the entrance. Look at him. Is he running or just walking? If he is walking, stand your ground and shoot the crawling zombies (with a shotgun if possible) and switch to an automatic weapon. Kill one or two zombies on the entrance so he can get into the room to be with you. If he's running, let him inside the room but run outside as soon as he does LOL.

Now here's the thing about the boss. When you hit him somewhere sensitive, he will tilt his head up for some time and let out a gurgling scream. If you don't hit him in the right spot, he just stands there and seems bullet-proof! The first thing you need to do is find his soft spot. You can find it by using a rifle and shooting at different parts of the body. When his head tilts after hitting a certain spot, then that is his soft spot. CONTINUOUSLY SHOOT AT IT UNTIL HE DIES. My personal favorite is his neck but sometimes, his stomach and feet work. But there's a catch. The boss has to be close to you if you want to make sure that you hit a soft spot. And unless you find it, you won't be able to kill him.

Yep. I hit his soft spot alright!

When you run out of ammo and the boss isn't dead yet, he will get back to his original position (which is standing and staring at you). If this happens, you have to leave the safe room and run! His hits are deadly and you want to avoid them.

While running around like a lunatic, I use a shotgun to kill regular zombies and switch to my minigun when he gets near. But you can use any automatic rifle you're comfortable with. Every time you hit his soft spot, aim at his neck right away and continuously shoot until you run out of ammo. Sometimes, I also make a run for ammo while the boss is chasing me around. This can be really nerve-racking!

The first boss is dead, now what?

When the first boss dies, time slows down until he falls on the ground. The whole slow motion lot is going to be entertaining. However, I suggest you take this as an opportunity to refill your ammunition instead of staring at the Matrix thing that's about to take place. After all, you will need more bullets until the second boss arrives. If you lost too much life after the first boss, just use a bandage and hang on. Now go kill the second boss.

My "Lucky 13" Bloody Subway Arena Survival Tips

1. Use a shotgun when running outside of the safe zone. Just shoot at zombies closest to you and avoid the the rest until you get back to the caged room.
2. Don't run for petty cash during waves. Unless you are absolutely sure there are no zombies around (and the cash is really, really close to the entrance), don't go for it! You will be paid hundreds of dollars if you survive a wave :-) The higher the wave, the greater the reward. Besides, losing some life for $50 to $70 is not worth it.
3. Only use your bandages or medkits during emergencies. Anyway, you can run for Additional Health in between waves.
4. Use your Revive Kits sparingly. If you are surrounded by a swarm of zombies or confronted by the boss zombie and got nowhere to run, let yourself be killed and the Revive Kit will kill those bastards.
5. If you can run, then run! One thing I learned from The Walking Dead is that those f*ckers are stupid and you can avoid them.
6. Always shoot the fastest and closest zombies to you first. Then shoot the close but slow zombies. A slow and close zombie, you can avoid. You can merely run around the safe room and it won't be able to hit you. But a running walker? You won't be able to avoid it if it comes near you.
7. Shoot in the head. Yep. There's no better way to kill them. Carnages are awesome but they are a waste of ammunition.
8. Use long-range weapons for dismembering and killing zombies from afar.
9. Use any automatic weapon on the boss (even if it's long-range).
10. Use a shotgun for the SWAT zombie and for killing crawling zombies on your entrance.
11. Look at the radar. The appearance of zombies actually takes on a pattern every now and then. Monitor it so you'd know which zombies to shoot first :-)
12. Only use the Head-Flator/Damage Booster during boss levels. I recommend alternating between the two in the early stages but at higher levels, I recommend only using the Damage Booster. Check out my tips above on these power-ups.
13. Practice. It takes time to get used to this routine. You might not get it at first but you will eventually. So keep practicing until you get your rhythm.

Oh, and by the way! Start playing the Bloody Subway from 100 percent battery. You can plug in your device to charge while playing. If charging affects the responsiveness of your screen, only charge during non-boss levels where you can relax :-) Hope you benefit from my tips!