Some of my favorites

I love most all adventure games, so I could probably fill this whole list with them. Curse of Monkey Island is one of the best though. It had a good length, good puzzles, and was hilarious.

It isn't revolutionary and it doesn't have a stellar story, but it is just plain fun to play. Playing co op with the surround sound turned up loud on the HDTV is just so fun and intense.

I was never good at it and never learned all of a character's moves, but I still loved to play and button mash with my friends.

My brother and I put countless hours into this damn game.

I honestly never finished the first Half-Life without cheating because it was too hard for me, but oh well. Half-Life 2 was very exciting and engaging.

Yeah my dad made the game, so I may be biased, but it was an awesome game. The first game to really introduced strong teamwork, and jetpacking around is still fun.

The best multiplayer game on the Gamecube. The four player fighting craziness is just too fun.

On here simply for the first chapter of the game, which I felt was better than the rest of it. I loved the new controls and gameplay, but I just wish it was scarier.

I played it for about a year once it came out, and then I took a break because I got bored. However, recently I have found myself playing it again because of the expansion coming out soon.