In the game's single-player mode, the player must complete 24 levels where different types of AI-controlled robots will try to hinder the player's progress. In each level, the player must find and destroy a reactor, then escape the mine through an exit door before the mine self-destructs; failing to escape costs the player a life and all of the points earned on that level. Every fourth level has a boss robot that takes the place of the reactor. Each level is composed of a set of rooms separated by white, blue, yellow, or red doors. White doors can be opened by simply firing weapons at them or bumping into them. However, the other colored doors require a key of the corresponding color to be opened. Along the way, the player may also find and free a Guide-Bot, an assistant that shows the player the way to a specific target.