Jet Set Willy Online
 

http://www.jsw.ovine.net/

If you dont care about online shooters or roleplaying games, try this. Its the classic Jet Set Willy with online multiplayer modes, like Tag, collecting and racing. Also, If youre artistic, you can create your own "Willy" and show it to everyone.

Altough it seems to be old, there are players every now and then (and probably some more after you download it). The forum community there is semi-active, as theyre about to release new version soon, which adds stuff like level editor.

Thank you TheChosen, had a good laugh with that expression.
:D

Check out the game requirements :D

Requirements
A Computer (helps), Direct X 8 (minimum) and Port 7002 Incoming unblocked. We also recommend a pair of trousers, although this is entirely optional. :D