Repton 3 for Win32
This is a neat little clone of Repton 3 for Windows which plays really well, as far as I can see it has complete functionality and is quite stable. Problem is I can find no contacts for who wrote this game (the supplied email address is dead), so if this is your game, drop me a line!
Oh and incidently, this game is for Windows, but if you have Linux and Wine/WineX you should be able to play it with that.