Oh, for anyone with a PC and a 360 controller, one of the best free games i've played in a long time, and also one of the bette "competitive" games i've played in a long while with a friend while baked is Wroom.
It's a 2D car game that uses bouncey physics. Basically have to jump and spin your car in the right wat to get from the start ot finish. A bit like the old school internet motogross games. While it can be played in 2-4 player split screen, me and a friend would spend hours on it just playing single player, basically you get a ghost car for every best run set, and you just sit there blazed replaying levels for hours just beating each other by that 0.01ms gap. One of those simple games that get's really fun and addictive. I rarely recommend games to people, but Wroom is great. And man oh man, when you're high as a kite, the music to that game is stupidly annoyingly addictive. Doo do do do doo do do do do doo do do do doo do. Such a fun game, and it's like a 15mb donwnload, there probably isn't a computer around that can't play it. But as i say, use a controller, using the keyboard SUCKS but can be done if you want, but basically analogue sticks offer so much more control, you basically can rotate your car infinately given the height of the jump made, but you have to be able to rotate to the eprfect angle for landing so as ot either maitain speed or be able to get past the obstacle, and a keyboard ust doesn't cut it.