Space Dungeon - MAME - Shoot 'em Up

Each level of Space Dungeon consists of 36 rooms arranged in a six-by-six grid. Rooms are connected by open doorways of various sizes. One room in each level is the entrance, where the player begins, and another is the Collect Bonus room. Other rooms may or may not contain laser defenses, hostile aliens, or various bits of treasure. The goal in each level is to navigate using an automap to the room containing the "Collect Bonus" area, visiting as many rooms and collecting as much treasure as possible along the way.