Oxyd

Oxyd is a 1990 puzzle game developed for the Atari ST and ported to the Amiga, Macintosh, MS-DOS, and the NeXT platform by Dongleware Verlags GmbH. It is a game of puzzles and tests to restart all the oxygen generators (called Oxyds) on the player's home planet. The Oxyds must be restarted by opening them in pairs of matching patterns, and (in colour versions) matching colours.

The Atari ST version was developed with the Megamax Modula-2 programming language.

Gameplay
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 player has an inventory and can add some items to the inventory by rolling over them. The game's playfield is called a landscape. The player must open all of the Oxyds to progress to the next landscape. Oxyds must be matched in pairs. An unpaired Oxyd will close if an Oxyd of another pattern or colour is opened.

Some landscapes also contain textual clues, which the player can place in their inventory by rolling the marble over them. They can then be selected and read. There are clues on many landscapes: some are helpful, but others are confusing or not so helpful. Other useful items include bombs, dynamite, spades, keys and computer disks. These items may be placed in the inventory, and can create or destroy blocks, create holes, fill holes, and open doors. There are other interactive blocks, including movable wooden blocks, lasers, mirrors, hidden passages. There are also dangerous areas, including bottomless pits, crumbling floors (which collapse if the marble has been rolled on them several times), slides, pools of water to drown in, quicksand (which the marble will slowly sink in), and assorted traps.

Some levels invert the player's controls, and in the sequel games, the player has to control several balls, which shatter if they touch each other.

There were two-player levels with one black and one white marble that could either be played by one player, alternating his mouse control between either marble, or by two players playing on two interconnected computers. The interconnection would be accomplished by MIDI on the Atari ST, or by the serial ports on other machines. Players had to collaborate, not compete, to complete such levels.

Marketing
Oxyd was free to distribute and easily obtainable from shareware CDs or bulletin board systems. The first ten levels could be played without restrictions. From the 11th level onward, at various intervals throughout the games, "Magic Tokens" blocked crucial parts and passageways of the landscapes, mostly rendering progress impossible. These stones could only be removed by entering a code. The Oxyd Book was sold separately for $39, with code tables matching the information given on the Magic Stone. This form of software protection used the book as a dongle or code wheel; however, unlike other games which use the code book protection approach, the game itself was free.

Sequels and re-releases
Oxyd gained enough popularity to spawn a number of sequels: Oxyd Magnum, Oxyd Extra, and per.Oxyd (also known as Oxyd 2). Additionally, Oxyd itself was a sequel to a lesser-known game, called Esprit.

The Oxyd series is no longer maintained by Dongleware.

Enigma is an Open source fangame with over a thousand different landscapes that can also read the original Oxyd level packs (they are not included for copyright reasons). Also the included "Dejavu" level packs contain levels with similar ideas to the original levels.

Mad Data, with the permission of Dongleware, has produced an official freeware game with the name "Oxyd extra v2.0".

Reception
Computer Gaming World in 1993 called Oxyd "My favorite new shareware title ... an exceptional offering, guaranteed to provide numerous hours of enjoyment".

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Trivia
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