Operator Ace's Simple Infinite Survival

Operator Ace's Simple Infinite Survival is a wave-based zombie survival shooter set in an alternate 1980s dystopia. Play solo or team up online with up to three friends to fight increasingly fast, tough and aggressive zombie waves. You can aim down sights or use tactical point-fire, adapting your weapons, tactics and teamwork as the pressure rises.

Fight the horde

Call in airstrikes, summon a Drop Pod for supplies or heavy firepower, and deploy a P.D.E.S.C. bot or awaken the C.E.D.D. Drop Pods can also bring heavy ordinance and auto turrets. Multiple airstrikes can be used and found on the maps.

Perks bought at points around the maps grant special abilities. The description lists six perks currently and later refers to 10 available; it also says more will be added over time. Each map has traps with distinct appearances and functions: some deal heavy damage quickly, while others slow the horde to help you escape. Use the Munition Maximizer to upgrade basic guns, and choose from dozens of weapons and variants, each with custom attachments, sounds and stats.

Maps and challenges

The game currently has seven maps: Death Valley, Last Resort, LockDown, Bunker, Disturbia, Proving Grounds and Rise of the dead, plus a bonus Shooting range. Practical puzzles can unlock secret rooms, hidden weapons and Easter eggs. You can also defeat unique bosses to complete a level, or keep playing infinitely to see how long you survive.

Characters and progression

Choose from five characters, all available from the start. Weapons, perks and items are available during each match and can be earned through skill or luck; there is no grinding. The only progression system is a simple rank, included for bragging rights.