Sublevel Zero is a rogue-like first-person shooter developed by Sigtrap Games for the PC, Mac, and Linux platforms. The game takes place in a universe where reality seems to be falling apart. The player pilots a lone gunship and, in an effort to collect ancient technology that could save the player's clan, they must descend into a vast underground facility. The game is inspired by games like Descent and Forsaken, and features similar freedom in controls. The gunship can move and rotate in all directions.