The game consists of six levels. Though an ending screen is displayed after the player finishes all of the levels once through, the game's true ending is only displayed after the player completes the levels a second time under increased difficulty. The game starts off in a ruined Bydo base, and continues through a giant cave where waterfalls can prevent the ship from progressing. The player battles several huge battleships in the third level, and the terrain constantly shifts around during the fourth and fifth levels. The final level takes place on the Bydo home planet, where the alien organisms are cloned and mass-produced.