dragon seeds (ps1) rare and classic! graffiti kingdom (ps2) creative and fun harvest moon (ds) addicting civilization 3 (computer) heroine addicting morrowind / bloodmoon (computer) greatest mod it up game ever!
Deadly Rooms of Death for Windows and Linux. It's one of the most challenging games I've ever played. At the link below you can download the full game for free, just look for Architect's Edition on the downloads page.