The Reticule writes: "Trine is the best co-op game you'll ever play by yourself.
Or, for that fact, it's one of the better ones you'll play with other people. It's clever like that.
The concept is simple, and that's part of the appeal; three generic adventurers (wizard, thief and warrior), all happen to be in the same place at the same time, and all touch the same magical gem, that just so happens to fuse their souls together, meaning the occupy the same body. What this means in terms of playing the game is that you can switch between all three instantly, and also let your friends play as one (or both) of the others. You then must work your way through dungeons, forests, forges and evil towers to allow the three to be freed, all the while killing skeletons and manipulating your environments to advance."