Good single-player offline game
I've searched high and low for suggestions for good single-player offline games for Linux and I get a lot of fps suggestions, but no real info on any of them.
I'll be without internet for a while soon and I'm looking for something to keep me busy and entertain me.
I've got AssaultCube and 0AD installed already, but AC is best played multiplayer.
Any suggestions for something free with a decent single-player mode? It can be anything from fps to platform. Frankly, Windows suggestions are welcome too.
HP Pavilion dv6, Core i3-3110M, 6GB RAM, nVIDIA Geforce GT 650M, 640GB HDD: Win7 / Lubuntu 13.04 64bit