If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Its a good thing for trigger happy action heroes is that Bio genetic experiments always seem to end in zombies! Plenty to shoot to pieces with a wide range of various guns!
A / D - Move.
W - Jump.
S - Duck.
Mouse - Aim / Shoot.
1-4 - Switch Weapon.
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