A redditor emailed in to highlight a post they made on reddit after going to SDCC where they spoke to the developers of The Witcher. The developers confirmed to them a Linux version of The Witcher 3 exists.
Only If is a surreal first person adventure-puzzle game. You play as Anthony Clyde, who, after a heavy night of partying, wakes up to find himself in an unfamiliar bed with no memory of the previous night's events.
If you've played Left 4 Dead 2, then you might have had the chance to smash zombies with a guitar. However, if you haven't then here's a game that focuses exactly on that. Cue the music and let's go kill a horde or two.