minesweeper xD
Civ games as there are different ways to win
Minecraft, just jump on multiplayer servers and you never know what crazy adventure you'll find.
as for FPS, what ever really xD currently mixing up between CS:GO, BF3, BF4A (yeaaaa

) and Wastelands on Arma2 (yet to try on Arma3 but I hear good things).
Especially wastelands I would say as although we end up doing the same things each time It's always different. jump in server, find vehicle, find a gun and meet up with squaddies, locate objective, head for it/ambush, run away with loot, get better guns, find next objective xD
but it's a pretty big map, 3 teams (one team is free for all or you can group up), varity of objectives, base cap, weapon cache drops, downed air vechicles/tanks to fix up and then use. tis good fun

we ended up yesterday with my friend upgrading the SUV with speed so it coudl go much fast and I was surfing on the roof in the mounted RPG launcher... looked ridiculous but was so much fun xD game isn't for everyone as it's twitchy, glitchy, prone to hackers and a bit of a learning curve but still enjoyable even if ya rubbish like me
