Six Feet Under

Six Feet Under is a Boulder Dash variant for Windows 3.1. The game mechanics are fast explained: You are in labyrinthine underground caverns and have to collect a certain amount of crystals and get to the exit. You dig through the soil and watch after chain reactions, e.g. you dig the dirt under a rock away and it falls down on an enemy. The first levels are tutorials to learn additional gameplay mechanics like getting extra time, fleeing from lava and using or throwing bombs. Your progress is saved through a password system.