Shadow Man 2 was originally going to be essentially the first Shadow Man game, but with a new content – a new story, levels, etc – and a relatively short development time (~6-9 months, if I recall). During the development, I think the engine was rewritten/replaced at least a couple of times. The story/design also changed significantly compared to the early versions I saw. Also, Mike – the Shadow Man himself – underwent a significant makeover. And there was less of the puzzle solving of the first and more emphasis on hand-to-hand combat. Ok, it was a completely different game. Oh yes, and PS2 exclusive. Completely different. The final game took over two years to complete.