The main objective of the game is to get to the exit of each level, while destroying enemies and collecting points. Many objects onscreen can be shot including boxes, obstacles and blocks. Besides points, some collectibles include health powerups, gun powerups, and some inventory items with special abilities. The final level of each episode has no exit, and is instead completed by finding and defeating Dr. Proton. At the end of every level (with the exception of the last level in each episode), the player can receive up to seven 10,000 point bonuses, earned by making certain achievements in the level, such as destroying all cameras. At least two other Apogee titles, Duke Nukem II and Rise of the Triad, have similar end-of-level bonuses.