Geist

Geist is one of the best gamecube titles I have ever played. The game is very long because the puzzles and challenges you have to solve take some time. Now don't get me wrong, the game has some good action to it, too. There are a variety of bosses and creatures that you have to fight and they are also pretty challenging. In Geist, you play as the ghost of of a spectral officer, who's body has been put in a horrible experiment and ripped away from it's spirit. Your mission is to find your body and and attempt to save one of your friends. You can posses many people and objects to complete your missions.