- Steam pricePrice
- Free to play
- Release
- October 16, 2017
- Session GoalsGoals
- Modes
- Platforms
How co-op works
Four online players form a fireteam across seven story maps and other modes. Assault, Medic, and Heavy Gunner builds supply distinct skills; teammates coordinate temporary cover, auto-turrets, room-clearing abilities, elemental armor resistances, and strongbox loot against evolving zombies and bosses.
About this game
SAS: Zombie Assault 4 is a free-to-play action shooter that blends wave survival with deep RPG progression. You and up to three teammates fight through relentless zombie hordes, unlocking and upgrading weapons, armor, and class-specific abilities as you push deeper into hostile territory. The game supports both solo runs and four-player online co-op, with optional PvP modes like Last Man Standing for competitive variety.
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Gameplay revolves around tight gunplay, tactical positioning, and smart resource management. Each class brings unique skills and special abilities that encourage specialization and teamwork. Looting, leveling, and fine-tuning your loadout keeps every session rewarding, while the variety of mission objectives and enemy types demands coordination when playing online.
Available on Windows and Mac with cross-platform multiplayer, the game thrives in cooperative sessions where callouts and covering fire make the difference. Whether you're grinding for rare drops or racing to survive the final wave, the co-op structure rewards communication and strategic planning.
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Frequently Asked Questions
How many players can team up in co-op?
Up to four players can team up online to fight through the zombie hordes together. The entire game can be played solo or in co-op, and it supports cross-platform multiplayer between Windows and Mac.
What makes the co-op teamwork important in this game?
Each class has unique skills and special abilities that encourage specialization, so coordinating your team composition matters. Success in higher difficulties relies on tactical positioning, callouts, covering fire, and smart resource management as you face different enemy types and mission objectives.
Is this a paid game or free-to-play?
SAS: Zombie Assault 4 is free-to-play with in-app purchases. You can progress through the entire game without paying, but optional purchases are available if you want to speed up progression or unlock cosmetics.
Can I play PvP modes with my friends?
Yes, the game includes PvP events like Last Man Standing alongside the main co-op content. These competitive modes offer variety beyond the core zombie survival gameplay.