They're plotting against you - Descent's aliens are like no others. They use artificial intelligence to learn your move, adjust their tactics and ambush you from all sides. The full 360-degree 3-D environment will keep your head spinning. Whether you're annihilating aliens alone or hooking up with a network of other players, explosive, multidirectional play, spectacular sound effects and sizzling weapon systems will keep you in command. Macintosh Multimedia & Product Registry Volume 9, No.4 - 1996
Featuring a full 3D engine a year before Quake was released for the Mac, Descent is the brain child of Michael Kulas (Ultima Underworld) and Matthew Toschlog (System Shock). But unlike those last two games, Descent is all about blowing things up. Robots, doors, reactors, other players—you name it.
Descent was substantially improved in the transition from DOS to Mac OS. Its screen resolution more than doubled (640x480 vs 320x200), and its MIDI music became studio-quality CD tracks.
To run this in Mac OS X, you'll need the DXX engine.
Although Descent can be installed in SheepShaver, it runs much too fast.