You might want to try a simpler approach and use a source port named jHeretic which ran very well for me in the past, which can use 3D acceleration. The 3D models are optional, and I personally think they look weird in a Doom engine game.

Adventuresoft's website is very limited it seems. They have simple technical FAQs up for both Simon 1 & 2 which are identical, and the questions don't inspire confidence in these ports working well on our current DirectX7+ Windows 2000 machines. The only download I can find is a patch for the …

There are Windows 9x ports of the Simon games. I didn't think they were all that polished compared to the original DOS versions, but beggars can't be choosers and all. I don't know if Adventuresoft have a free patch available, I have seen these ports in the double pack CD edition of the games.

Just thought I'd add a couple of games I know had Win3.1 (yes, not 9x) ports that aren't listed. Both the Deja Vu's did (one is listed), as did D-Generation, the classic isometric shooter. Simon the Sorcerer 1&2 CD versions do both have a Win9x port, they came with at least the old large boxed …