Fourfold Onslaught is a thrilling round-based survival game designed entirely around spatial audio feedback and keyboard input. You play as a test subject locked inside an advanced research laboratory. Your sole objective is to survive as many rounds as possible against relentless waves of zombies that breach the facility through four doors—one on each side of the arena. With no visuals, you must rely on a directional aiming system and a built-in radar to maintain full situational awareness and know exactly where threats are coming from.
The gameplay loops through intense combat and strategic preparation. During the Active Phase, you must use your hearing to aim and shoot zombies, with different audio pitches guiding your accuracy. Defeating enemies earns you coins. Once a round ends, you enter a limited Upgrade Phase where you must quickly navigate to eight different upgrade machines positioned around the map. Here, you can spend your hard-earned coins to improve your health, defense, movement speed, or upgrade your weapons. Investing wisely during this brief window is the absolute key to surviving deep into the game, especially as zombie waves become faster, tougher, and more explosive with each passing round.