Minetest - Minetest is a near-infinite-world block sandbox game and a game engine, inspired by InfiniMiner...
Dwarf Fortress - Dwarf Fortress is a single-player fantasy game with two modes: fortress and adventure.
Roblox - Reimagining the way people come together.
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.
Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.