I've seen and played a LOT of games on the Internet. But I like to play games that are actually good.
So, if you want to play some Internet games, here are 5 that I like:
Best puzzle game: Bloxors (Tip the Bloxor to get it in the hole)
Best puzzle adventure game: Shift 1 to 4 (The narrator lies a lot)
Best stupid game: Super Mario Bros. Goomba Mode (You're the bad guy)
Best sidescrolling shooter: Aqua Slug (It's intensely difficult)
Hardest game (No, not Aqua Slug): The World's Hardest Game(The less you die, the better your score)
I hope you like these games, cuz' they're fun!