ZKILLER is a first-person shooter survival horror video game set in a zombie-apocalypse world featuring an advancement system, full-detailed environments, and unlockable weapon and levels.

ZKILLER gameplay includes a player fighting through waves against a horde of zombies. As waves pass, the enemy count will surge, and different types of zombie are spawned with the final wave ending up in a boss fight. The player is equipped with four different weapon slots to be supplied with melee weapons, handguns, assault rifles, shotguns, light machine guns, and grenades. Random ammo and health packs can be found by exploring the map, though the player has a limited amount of weight to carry. The player loses health when hit by zombies or by certain environmental hazards (i.e., explosions).

When players kill a zombie, they earn in-game experience points and money according to headshot, combo, and melee kills. Zombie killer levels up when a sufficient amount of experience is obtained. The levels can be used to unlock maps and to buy different types of weapons and more. To purchase a weapon, the player should reach a certain level and gather enough money. Achieving more head-shot kills may cause the game to enter an advanced slow motion time, a few seconds where all game actions for players and all zombies are slowed down, which for the player can be used to carefully target their next shot or start a different procedure of action.

The developer accepts donations. Click on the Author link above, then download to get to the donate page.