Omegamatic Warp Drive
Commander Keen begins the game in the center of the Omegamatic Warp Drive (also known as The Hub). There are two main features of the Warp Drive: three teleporters and three crystal-like indentations in the ground.
Each teleporter will send Commander Keen to a different world (Droidiccus Prime, Fribbulus Xax, Shikadi), from which he can enter one of three levels of play. The three crystal-like indentations are for three plasma crystals that, once united in the Omegamatic Warp Drive, will destroy the sub-space anomaly. Planet Earth is safe! Victory!