

Some landscapes also contain textual clues, which the player can place in their inventory by rolling the marble over them. An unpaired Oxyd will close if an Oxyd of another pattern or colour is opened. The player must open all of the Oxyds to progress to the next landscape. The game's playfield is called a landscape. The player has an inventory and can add some items to the inventory by rolling over them. The player controls a small black marble that rolls around, touches things to activate them (Oxyds are opened by touching them), and bashes things to move them. The Atari ST version was developed with the Megamax Modula-2 programming language. The Oxyds must be restarted by opening them in pairs of matching patterns, and (in colour versions) matching colours. It is a game of puzzles and tests to restart all the oxygen generators (called Oxyds) on the player's home planet. Oxyd is a 1990 puzzle video game developed for the Atari ST and ported to the Amiga, Macintosh, MS-DOS, and NeXT by Dongleware Verlags GmbH.
