best site for online games?

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need help, what are the best sites for playing online games that don't need to download the game? i love playing online games that i tried so many websites like freeonlinegames, yahoo games, freearcade, heavygames, miniclip, shockwave, etc. but i get bored easily after some days of playing it. i like it to be adventure and 3d. i hope someone can help me. thanks for reading.