Minetest is an infinite-world block sandbox game and game engine inspired by MineCraft. It’s free and open-source. It supports both survival and creative modes along with multiplayer support, dynamic lighting, and an “infinite” map generator.
Minetest is available in Ubuntu since 12.04 Precise, but it’s old. The latest version has reached 0.4.6 (changelog).
The Minetest Developers PPA provides the latest stable version of Minetest for Ubuntu 13.04 Raring, 12.10 Quantal, 12.04 Precise.
To install it, hit Ctrl+Alt+T to open terminal for running commands, then:
Add the ppa repository:
sudo add-apt-repository ppa:minetestdevs/stable
sudo apt-get update
sudo apt-get install minetestc55
Once installed, launch it from the Unity Dash. Enjoy!