You can find it on Home of The Underdog. The official site got lost some rewrites ago, but there will probably come some new site again. I could add compiled versions to the repository for reference... It's a sokoban-like game, but a lot more enjoyable.

The .exe and the data files: http://plasmaworks.com/files/pits/pits95.zip

The level editor (Source Code got lost, but Apache-license is also valid for this one. If someone can disassemble it and create some maintainable sourcecode from it, very welcome) http://plasmaworks.com/files/pits/pitsedit.zip

Screenshot for reference (more googling for puzzle pits): http://www.google.com/imgres?imgurl=http://www.old-games.com...