Released in 1990 primarily across Europe, the Game Master was one of those miserable attempts to beat the Game Boy in market success. Online specification information is poor, but it is known to have a 64×64 monochrome screen with the NEC upd7810 CPU. Since it was so weak, it probably had alright battery life and longevity, but the quality of it's games did it no favors.

http://videogamekraken.com/game-master-by-hartung

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For general information, see the Game Console Revisions Overview.

There are two versions of this console, arranged chronologically.

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Released under many different names that all possessed the same form factor, this version of the console came in a sideways design, similar to the Sega Game Gear. It appears to be compatible with all of the games released for Game Master country variants which are “sideways”. For this reason alone, this will be considered as the “superior” Game Master, even though the console still sucks.

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A French redesign of the Game Master, this version is easily distinguished by it’s vertical design that’s similar to the Nintendo Game Boy. Crucially, this version was rendered incompatible with cartridges for Game Master systems, making it essentially pointless to acquire, as the Game Plus cartridges are still playable on any Game Master system.

There are no revisions within any version. BEST RELIABILITY couldn’t be assigned.

https://en.wikipedia.org/wiki/Game_Master_(console)

http://videogamekraken.com/game-master-by-hartung

https://crappygames.miraheze.org/wiki/Hartung_Game_Master