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

1K Ratings

1K Ratings



So i had this game since it first came out, I even played sas3. the game has good customer service which is a plus. However they have only had like maybe 5 updates the whole time they have had this game. They have not added any new maps and they only recently just started adding new guns but you have to buy them with real money. I feel that ninja kiwi doesn't care much for their mobile games, because sas 4 on the computer has way more, the mobile version can't even compare, if this game was taken care of just a little bit better I would rate it higher but since I've had it for as long as i have, I'm really disappointed with the company for making such a fun game and not maintaining it a a satisfactory level. I play other games where the company is always trying to spice their game up for the seasons and holidays, ninja kiwi doesn't do that so it makes a lot of their games really dull, it just loses its fun potential really quick. And it makes me sad because ninja kiwi puts so much effort in a game then release it but then they just ditch it and don't keep up with the glitches and other issues that they might have. I just wish that they did a better job at that because they really do make awesome game.

Awesome but needs minor changes


I love this game, it's addicting and the idea is cool, but some things make me kinda annoyed. First thing is nightmare. I think they should up the min Level for nightmare. I'm only level 63 and when I get matched up with 3 other level 35s, it's very hard to get a decent game in, let alone kill a savage dev. And if they don't, at least balance the game a little when playing with lower levels. One of the things I hate most is when people leave games at the last second. Once one person leaves, the rest follow. You shouldn't be allowed to leave after the 5 sec count down. Every time I get matched with lower level people and when I finally get decent players, they all leave at the last second so it's too hard to play the match with 3 or less people. Other than this it's a fantastic game and you will enjoy this game.

Just a couple problems...

Michael pulo

Over all it is a great game but the High Damage ammo is way to expensive for an example my favorite gun the CM 800 Jupiter red class and black class my current one I have is just Red class and it costs around 30,000 for 120 ammo and that cuts u down on money real fast please try to either lower the High Damage Ammo cost or just give like 350 High Damage ammo and keep the same price... The last thing it for the elite Augment cores I have a LV 100 account and I have NEVER got one yet!, You should at least make the easier to get, Same thing with black Keys I literally have 40 Black strong boxes to open but 0 Black keys and my lv 50 acc it is the opposite I have Black Keys but no Black Strong Boxes. Over all I love the game just try to fix those problems.. Thank You😁


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. Starter Pack $2.99
  3. Promethium Strongboxes x 5 $4.99


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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