Toki
A quite good Arcade game from TAD Corporation.
Home computers ports were executed by OCEAN (famous for this kind of production)
An unreleased cartridge game for GX4000/CPC+.
A supposed screenshot was shown in Amstrad Action (although this may have been a mock up). This game is believed to have not been finished.
Some Advertisements claimed it would be released alongside Amiga and Atari ST ports, but it ended as a VaporWare. The same goes with the Speccy version who managed to get pictures in ZX Spectrum press, but ended as a VaporWare too.
The main problem is that this game could have been a bit too ambitious for a 8bit system.
The C64 port (only 8 bit home computer port release) wasn't that bad at all. But one of the main difficulty was the large and numerous sprites or Bosses used in the Arcade game.