Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.
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.
Dwarf Fortress - Dwarf Fortress is a single-player fantasy game with two modes: fortress and adventure.
Prison Architect - Build and manage a maximum security prison
DayZ - DayZ is an open world multiplayer survival game that tosses you in the midst of a zombie apocalypse.