Shamus

Inspired by the arcade game Berzerk, the objective of the game is to navigate the eponymous robotic detective through a 4-skill level, 128-room maze of electrified walls. The ultimate goal at the end of this journey is "The Shadow's Lair". Shamus differs from Berzerk in having a persistent world instead of rooms that are randomly generated each time they are entered. (wikipedia.org)