Purge the undead! Awesome upgradeable guns and armor, unique class skills, and 4 player co-op! Play the most intense zombie shooter on mobile, from the makers of Bloons TD 5.

A virus outbreak on a distant trans-federation planet unleashes horrors from humanity's past. A powerful, rapidly growing zombie horde threatens the very existence of humankind, and the only ones capable of fighting back are the highly skilled, highly weaponized special forces of the S A S. Choose from 3 unique character classes, maximize the fully customizable skill tree, and select from hundreds of weapons and armor pieces to build the ultimate zombie killing hero. Play dynamic, challenging levels in single player or 4 player cooperative multiplayer and give our ravaged civilization its last best hope for survival.

Zombies swarm the screen, exploding into bits under your hail of bullets. Each of the 17 unique zombie types have special attacks and behavior, and they can evolve - manifesting terrifying new powers as you progress through the game. And just when you think you've beat them all, savage boss zombies hunt you down, puking out acid worms or storming after you in rage mode. Learn their strengths and weaknesses as you lead the action across 7 story-driven maps with varying victory conditions.

Quickmatch with up to 3 other players of similar level and use the custom skills and weapons chosen by all players to form an effective fire team. Coordinate auto-turret placements, high level room-clearing powers like Assault Team, Aerial Bombardment, and Zombie Antidote, and move physics objects to create temporary cover while you paint the room red.

Over 160 incredible guns and armor pieces are locked up tight inside increasingly rare strongboxes that you can find in secret rooms or on the mangled remains of your enemies. Your loadout includes a pistol and two rifle class weapons - choose from fast firing submachine guns, devastating shotguns, high damage assault rifles, brutal machine guns, flamethrowers, rocket launchers, lightning guns, and more. Armor up for protection against physical, thermal, and chemical attacks, then round out your arsenal with auto-turrets, grenades, and special high damage ammo to rip through the undead before they rip through you.

The Assault, Medic, and Heavy Gunner classes each have unique upgrade trees, giving each character 19 skills to customize. Hundreds of guns and armor pieces have a range of grades and a powerful RED version when you reach high levels. In addition you can add powerful augmentations to your guns and gear which enhance core properties like damage and rate of fire, but can also improve reload time, resist damage, and heal.

Download for free and play SAS: Zombie Assault 4 now!

Currently in development - private matches and events. Please be patient and know that private matches is a top priority.

Please Note: SAS: Zombie Assault 4 is free to download and play (aside from internet, carrier, data, device, and other services for which the player is financially responsible), but some in-game items can be purchased with real money. You can turn off the payment feature by disabling in-app purchases in your device's settings.
SAS: Zombie Assault 4 is recommended for players 12 years of age and older, and the fantasy violence, gibs, and zombie blood are to be expected given the survival theme. We have included a "Gore" setting on the Options screen specifically for young or sensitive players, and this removes the blood and gibs when Gore is toggled Off.

What’s New

Version 1.9.1

* Fixed a display issue that some players were experiencing.

It's every man for himself in an all new special event, Virus Samples.

The research corporations want virus samples from the undead and they're prepared to majorly reward whoever can bring in the most. Compete against your teammates to collect the most virus samples from defeated zombies and secure your place on the leaderboard for some big strongbox prizes!

Check the News section to find out when this exciting event is running so you can join in and get yourself some awesome gear.

Ratings and Reviews

4.5 out of 5
138 Ratings

138 Ratings

orgoner ,

You need to have played the game before

This game requires you to be good with a phone or other device or is is very hard to get out of sticky situations. From old gameplay it has been broken her and there and you need to fix, when you die and the boss drops the crate and the mission is ending that is what really made me mad can you make like a automatic pick up or something I have never been able to get a black item or augment which is a shame the best way to get money is to replay saving those survivors as they give you money when you help them I find playing that weird mutation one with those green sacks is the best for crates I recommend not playing co op unless you have good skills or gear and don’t go into dark mode unless you are fully equipped with turrets and grenades

MasteeMete ,

Amazing Game But....

This game is really fun. I spend hours and hours having fun on this game the game is about being part of the SAS You can make a character and choose between 3 classes. Medic, Heavy and solider. The game is a 2D Zombie game of killing zombies and doing missions there are a few things that let this game down. Not many maps there is a total of 7 maps which you have to unlock if there was a lot more maps it would be a lot more fun another let down is the bugs I have found at least 1 bug in every map. I do think that every time your stuck or out of bounds you will be teleported to your teammates this is mainly in multiplayer these bugs apart from that good game.

Dr_xeon ,

101% satisfied

Today is the day I decided to write a review on this game. This game has that kind of ring that makes it fun and challenging at the same time! This would require some bug fixes like when your doing vaccine if you don't make it in time for the train you get stuck outside and at the mercy of the zombies if you snuck around the back of the stair you can get out but this took me a while to figure out. If teleportation to the train would be possible MAKE IT HAPPEN! If you can make the crates depending on how many kills you got in that level so people with 100+ kills gets a higher chance for a better crate making people want to kill more zombies making it a bit more competitive?


Kaiparasoft Ltd
138.9 MB

Requires iOS 6.0 or later. Compatible with iPhone, iPad and iPod touch.



Age Rating
Rated 12+ for the following:
Frequent/Intense Horror/Fear Themes
Frequent/Intense Cartoon or Fantasy Violence
Infrequent/Mild Realistic Violence
© 2014 Ninja Kiwi
In-App Purchases
  1. Revive Tokens x 3 £0.99
  2. Promethium Strongboxes x 5 £4.99
  3. Starter Pack £2.99


  • Game Center

    Challenge friends and check leaderboards and achievements.

  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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