Gem'X
Platform: Commodore 64
Gametype: Undefined
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Like so many other puzzle games of the time, this game involves tiles of different colours, which must be manipulated to clear a succession of increasingly-difficult levels.

The basic idea is that you are presented with 2 sets of tiles, and must make the left one identical to the 'control' set on the right. The colours are defined in a sequence - red, green, blue, purple, yellow - and when you click on a tile, that tile's colour moves forward by two in that sequence (for example a blue one becomes yellow), whereas the tiles next to it move by one colour (for example, blue becomes purple). 

Any that move past the end fo the sequence disappear, causing surrounding blocks to drop. You get a limited number of moves, and limited time as well. Fortuantely there are passwords, delivered by cutely-drawn naked Japanese girls (although the private parts are covered up).

Trivia

Cancelled sequel
 The successor Gem'Z (DOS and Amiga) was already finished and ready to be released when the Amiga master was stolen during a trade fair in Cologne. Of course copies turned up everywhere and the publisher Software 2000 chose to cancel the release. 

Development
 This game was in fact developed in Germany, but designed so as to look like a Japanese game, complete with Japanesque graphics, (garbled) Japanese writing, and the name of the developers, Kaiko, chosen deliberately in order to sound Japanese. The Japanese influence goes even further, with the passwords referring to Japanese pop culture such as the FM Towns computer (totally unknown in Europe at that time), names from animation and Taito's arcade games. As a masquerade act, Gem'X was almost perfect.


http://www.mobygames.com/game/c64/gemx
