If want to play as zombie and fight agains and interstelar alien then try Martian Zombie Survival in the great fps sci fi with option to play in 2 mods and fun.
Enjoy!
How To Play Martian Zombie Survival?
*WASD* - move
*down*, *up*, *left*, *right* or *arrows* - move
*mouse* - look around
*space* - jump
*shift* - run
*0*..*9* - change guns
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Who Developed Martian Zombie Survival?
Martian Zombie Survival was created by BestCrazyGames.