Game suggestion

Can anyone suggest some fun, classic/small size games to me. Erm, I'm not sure how to describe what I'm looking. Something like tetris online or chips challenge. I'm just looking for some free games, platformers, puzzle games. Those whaddaya call em, 12-bit games? Hope you can understand what I'm talking about. Thanks =P

Have you tried Cave Story?http://www.acid-play.com/download/cave-story/There are others here as well, just click on the links at top.