Fourfold Onslaught is a round-based survival game. You are a test subject locked inside an advanced research laboratory. Zombies breach the facility through four doors — one on each side of the arena — and your only goal is to survive as many rounds as possible.

Combat, movement, and aiming are driven entirely through keyboard input and spatial audio feedback. A directional aiming system and a built-in radar give you full situational awareness so you always know where threats are coming from.

Between rounds you have a limited window to spend your coins at eight upgrade machines positioned around the map. Investing wisely is the key to lasting deep into the game.

Before playing, it's highly recommended to read the game manual, located at GameRoot/Documentation/Manual.html, to get a full overview of controls and gameplay.