Ok i want a fun game not online with multiplayer people and must be free. it has to be a game you just walk about doing anything. no missions no tasks nothing. I want be really grateful to person who helps me

Stick RPG. Free online game, very simple and it keeps you occupied for maybe a day or so. If this isn't what you're after then I don't care.

thanks for your help marco but i want it abit more realistic. i forgot to add that on first post

Want realistic sandbox ?
Get S.T.A.L.K.E.R Shadow Of Chernobyl,you can explore freely without doin' missions.

thanks ill check it out

erm try http://www.onemorelevel.com it has hundreds of cool games

or play roblox

played roblox was fun but i kinda got to old for it in my opinion

umm.. if you want a small file. play sumotori dreams. if you want no file at all. play Powder game or Stick Arena. if you want a moderate file. play Toribash. if you want a big file. play walabers trampoline. if you want a huge File Download a torrent on GMOD and SC source

Second Life might interest you.