SAS: Zombie Assault 4

Free-to-play top-down RPG shooter with four-player zombie-slaying co-op

Ninja Kiwi · Released Oct 16, 2017

Reviews: Very Positive; 86% of 11K
Recent reviews: Very Positive; 80% of 61 in 30 days
Players: 133; daily peak, Nov 7, 2026
Steam Deck: Verified
Last update on Steam: 1 year ago; Dec 17, 2024
Minimum PC: OpenGL 2.0 compatible; 1 GB RAM · 0.5 GB disk; Full requirements

What is SAS: Zombie Assault 4?

A free-to-play, top-down action RPG shooter set on a distant planet overrun by a virus-driven zombie horde. You choose an Assault, Medic, or Heavy Gunner and fight through seven objective-based story maps alone or in four-player co-op, collecting guns and armor and improving class skills.

For you if...

+you enjoy top-down shooting against large zombie swarms
+you want four-player co-op or solo missions
+you like loot hunting and class-based character upgrades

Not for you if...

−you dislike repetitive loot grinding and limited map variety
−you avoid free-to-play games with paid progression

What players say

86% of 10,854 reviews are positive · 80% of 61 in the last 30 days

Players often find the zombie shooting fun, particularly with friends. Common complaints focus on repetitive loot grinding, aggressive monetization, and longstanding bugs, including desync, lost mission rewards, and erased or rolled-back progress.

Players over time

▲ +3% vs a month ago

Players online on Steam, one sample a day.

Highest since Sep 2026: 160 players on Oct 23, 2026.

Show the data

Day	Players
Nov 7, 2026	133
Nov 6, 2026	96
Nov 5, 2026	125
Nov 4, 2026	121
Nov 3, 2026	118
Nov 2, 2026	122
Nov 1, 2026	138
Oct 31, 2026	121
Oct 30, 2026	115
Oct 29, 2026	118
Oct 28, 2026	130
Oct 27, 2026	120
Oct 26, 2026	158
Oct 25, 2026	122
Oct 24, 2026	137
Oct 23, 2026	160
Oct 22, 2026	142
Oct 21, 2026	138
Oct 20, 2026	133
Oct 19, 2026	115
Oct 18, 2026	143
Oct 17, 2026	140
Oct 16, 2026	127
Oct 15, 2026	137
Oct 14, 2026	119
Oct 13, 2026	132
Oct 12, 2026	137
Oct 11, 2026	153
Oct 10, 2026	132
Oct 9, 2026	110
Oct 8, 2026	121
Oct 7, 2026	97
Oct 6, 2026	105
Oct 5, 2026	125
Oct 4, 2026	139
Oct 3, 2026	116
Oct 2, 2026	86
Oct 1, 2026	100
Sep 30, 2026	92
Sep 29, 2026	96
Sep 28, 2026	109
Sep 27, 2026	108
Sep 26, 2026	103
Sep 25, 2026	80
Sep 24, 2026	99
Sep 23, 2026	63
Sep 23, 2026	91
Sep 22, 2026	108
Sep 21, 2026	117

Screenshots and trailer

SAS: Zombie Assault 4 system requirements

Minimum: OpenGL 2.0 compatible, 1 GB RAM, 0.5 GB of disk space.

As published by the developer.

Can my PC run SAS: Zombie Assault 4?

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Minimum

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

Does SAS: Zombie Assault 4 have co-op or multiplayer?

Yes: co-op online; PvP online. It also has a single-player mode. Crossplay with other platforms is declared.

Does SAS: Zombie Assault 4 run on Steam Deck?

Verified Yes, Verified by Valve: it works on Steam Deck out of the box.

All functionality is accessible with the default controller configuration
Shows Steam Deck controller icons
In-game text is legible on Steam Deck
Default graphics settings perform well on Steam Deck
External controllers are not supported for the primary player

PC version details

DRM: None declared on Steam
Controller: Full controller support
Platforms: Windows, macOS
Achievements: 64
Steam features: Family Sharing, In-app purchases
Languages: Text only: English.

Does SAS: Zombie Assault 4 use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Nov 7, 2026. How to filter AI games on Steam