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SAS: Zombie Assault 4

SAS: Zombie Assault 4

Purge the undead! Intense action-shooter with deep rpg elements, including upgradeable guns and armor, unique class skills, and class special abilities. Entire game can be played single player or as a 4-player online co-op game, including PvP events like Last Man Standing.

Released Oct 16, 2017 Developer Ninja Kiwi Platforms Windows · Mac Free to PlayZombiesMultiplayerTop-Down ShooterAction
View on Steam ↗ Free (US · as of 2026-07-26)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Data as of 2026-05-20.

86.2%positive9,112 reviews
Recommended · 8 found this helpful

“Enjoyed the previous games back in the browser days. This is solid fun and would enjoy it more if you have a few mates to play with.”

— a player, Steam review · 1 hrs played
Recommended · 8 found this helpful

“Man, this game is still epci after many years later.....”

— a player, Steam review · 44 hrs played
Recommended · 7 found this helpful

“although the demo for the fifth game is coming out soon, the fourth SAS Zombie assault game is one of the most iconic game in the series. Highly recomend as the game is very fun and can be addicting to some players”

— a player, Steam review · 8 hrs played
Read more reviews ↗

Player activity

Monthly average concurrent players. Live count fetched 2026-07-11 12:51 UTC · history via SteamCharts.

94playing at last check
13224-hour peak
1,497all-time peak
0 500 1k 2018 2020 2022 2024 2026 799 avg · Oct 2017

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-07-25.

64achievements
3.3%median completion
0.6%rarest: Map Champion - Recovery
85.2% of players 69.5% of players 51.1% of players 50.9% of players 39.5% of players 26.9% of players 26.9% of players 26.5% of players 21.0% of players 18.8% of players 17.6% of players 15.9% of players 15.7% of players 13.9% of players 11.7% of players 11.5% of players 11.0% of players 11.0% of players 10.7% of players 10.5% of players 9.3% of players 9.0% of players 8.1% of players 7.3% of players 7.0% of players 6.8% of players 6.8% of players 6.2% of players 5.6% of players 5.1% of players 3.5% of players 3.4% of players 3.3% of players 3.1% of players 2.8% of players 2.8% of players 2.5% of players 2.2% of players 2.0% of players 2.0% of players 2.0% of players 1.9% of players 1.9% of players 1.7% of players 1.7% of players 1.7% of players 1.6% of players 1.6% of players 1.6% of players 1.5% of players 1.5% of players 1.5% of players 1.4% of players 1.4% of players 1.3% of players 1.2% of players 1.1% of players 1.1% of players 1.1% of players 1.1% of players 85.2% 0% most earned rarest
Almost everyone has
85.2%Level Up — Reach level 2 with one character
69.5%Cleanup — Slow 5,000 zombies with the Biocleanse Bomb skill (Medic class)
51.1%For Me — Open 10 Strongboxes
Rarest badges of honor
0.6%Map Champion - Recovery — Successfully complete Recovery 100 times
0.7%Vehicular Manslaughter — Squish 5,000 zombies while driving a vehicle
1.1%Map Master - Vaccine — Successfully extract the vaccine 1,000 times

Price tracking

US-region pricing (USD), sampled twice daily by our own tracker since 2026-07-11. Steam prices vary by region — always confirm your local price on Steam.

Freecurrent · sampled 2026-07-26 08:39 UTC
Freelowest since tracking began2026-07-11

Latest official news

Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.

Feb 24, 2026
Zombie Assault: Resurgence - Demo Live Now!

The Zombie Assault: Resurgence demo is live now as part of Steam Next Fest! This demo is designed to showcase the core gameplay loop, progression systems, and co-op experience at the heart of Zombie A

Jan 30, 2026
Zombie Assault: Resurgence - Dev Diary #13 - Steam Next Fest!

Ten-Hut, Mercs!It’s the first dev diary of the year, and it’s a good one! We’re incredibly excited to share that a demo version of Zombie Assault: Resurgence will be participating in Steam’s Next Fest

Dec 12, 2025
[ SAS INTERNAL COMMUNICATIONS - SECURE ] >>

We’ve been going through the old files on Kurios station, and we’ve found references to a weapons cache the old Government had hidden away in case of emergency. How a zombie outbreak across the system

Oct 24, 2025
[ SAS EMERGENCY TRANSMISSION - SAON ]

\Requesting immediate support! Some sort of rift has opened up here on Saon and what can only be described as a giant monster has stepped out of it! It’s massive and is just shrugging off any attacks

Aug 09, 2025
Despite the setbacks, our mission is unchanged.

\ >> Thank you for your assistance in our research. Your help is greatly appreciated and the compensation we have provided doesn't begin to match the sacrifice you and your fellow agents have made for

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Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-05-20.

GenresAction, RPG, Free To Play
Player tagsFree to Play · Zombies · Multiplayer · Top-Down Shooter · Action · Co-op · Shooter · Top-Down · 2D · RPG · Survival · Singleplayer (SteamSpy community voting)
FeaturesSingle-player · Multi-player · PvP · Online PvP · Co-op · Online Co-op · Cross-Platform Multiplayer · Steam Achievements
LanguagesEnglish
ControllerFull support
Achievements64
Estimated owners1,000,000 – 2,000,000 (SteamSpy)
Official sitehttp://ninjakiwi.com
Minimum system requirements (PC)

Minimum: OS *: Windows 7 (32 & 64bit) Processor: 2GHz or better Memory: 1024 MB RAM Graphics: OpenGL 2.0 compatible, ATI, Nvidia or Intel HD Storage: 512 MB available space Sound Card: Windows compatible sound card