Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.
Xonotic - Xonotic is a free (GPL), fast-paced first-person shooter that works on Windows, OS X and Linux.
Clonk - Clonk is an entertaining, action-packed game of strategy, tactics, and skill.
Counter-Strike - Counter-Strike is a PC-exclusive FPS video game developed by Valve Corporation.
The Blockheads - Night is falling and your blockhead is freezing.
Quake - Quake is a series of first-person shooter video games released by id Software.