It is a game of puzzles and tests that challenge you to restart all the oxygen generators (called Oxyds) on your home planet.
The games playfield is called a landscape. To get to the next landscape, the player must open all the Oxyds on the current landscape. This is done by touching them, but they will only stay open if you touch Oxyds of the same color in sequence.
There are clues on many landscapes: some are helpful, but others are confusing or not so helpful. To help the player there are bombs, dynamite, lasers, mirrors, hidden passages, and other useful items. To retard the player there are bottomless pits, crumbling floors, slides, pools of water to drown in, quicksand, and assorted traps.
Oxyd is no longer maintained by Dongleware, however, the free game Enigma is a clone.
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