Ideally ones you can play when your boss isn't looking! Currently trying to beat the hi-scorer on this one (although by looks of it is IMPOSSIBLE!) http://www.playthecircus.com/games/knifethrower Addictive though. And if you haven't already played it, or you're new to browser-type games, I thoroughly recommend you check out Battlefield Heroes
http://armorgames.com/play/3527/gemcraft-chapter-0 few maps that take some good planning and quick swaps to pass
Quake live runs in the browser great fun, http://www.quakelive.com/#home Also every month CPC magazine have a games to try section that are normally quickies.
OGame http://www.ogame.org/ Addictive as hell in a slow burning kind of way, had to stop playing due to time constraints, but fun nonetheless.
2,760 on the knife thrower game, reckon i could do better with practice. if you life tower defence, play this. http://www.handdrawngames.com/DesktopTD/Game.asp edit: also, canabalt is cool, very similar to dino run in concept. http://www.pixeljam.com/dinorun/ edit v2: fl0w, if you like ambient games and simple rewarding gameplay (you get bigger the more you eat) then give it a shot. relaxing and theraputic. http://intihuatani.usc.edu/cloud/flowing/
What do you mean "How"? I managed 2100 on my first try EDIT: Yeah, this game isn't as hard as you make it out to be 3660 on my second go
damn just played flow for over an hour addictive gameplay anyone here tried the worlds hardest game? I cant get passed level 10
I'm obviously just slow in my old age. The second circus game comes out tomorrow so I'll beat you all on that one Im currently playing Crush the Castle at the minute which is also very addictive and my slow reflexes are ideal for it hehe
Jolly Juggler This one is even better than crush the castle. I don't know why, it's just really simple and addictive! Me and my work pals have been trying to beat the scoreboard all day!