Can't remember the name now but there was a series of 2D mech games on the Acorn/Archimedes where for their next game they were going 3D with massive hype and hugely ambitious features, about that time the RISC OS platform started to die out and when it finally launched was few people left to buy/play it, it was hugely watered down features wise and required the latest hardware to realistically be playable performance wise at a point where most people were swapping to spending that money on buying Windows PCs.