One of the most fun, unique games ever.
The game is point-and-click style. You alternate between three characters. The main protagonist is Dave, whose girlfriend was kidnapped by a mad scientist. The other 2 characters are yours to choose between several characters. They all have unique abilities that will come in handy during the game, so once you finish the game, you can play again with different characters and the game will go in a different direction, with a different ending and all. For example, one of the characters is a photographer, and has the ability to use a darkroom in the mansion to develop photos. If he's not in your party, you won't be able to do this, but you'll be able to do something else unique with whatever characters you have.
If you're a fan of adventure games, find a way to play this game.