Dwarf Fortress - Dwarf Fortress is a single-player fantasy game with two modes: fortress and adventure.
Theme Hospital - Business simulation game created in 1997.
RimWorld - RimWorld - A sci-fi colony sim driven by an intelligent AI storyteller.
Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
RollerCoaster Tycoon Classic - Create and run amazing parks on your iPhone or Android.
Castle Story - The creative voxel-based strategy game in which you explore floating islands, architect epic castles, and defend against hoards of enemies with your friends!