1. Super Mario Galaxy 2
While visually identical to its predecessor, Super Mario Galaxy 2 is actually a very different title, both in content, structure, and gameplay. Even the formula is similar -- Bowser, King of the Koopas, invades the Mushroom Kingdom for the umpteenth time and kidnaps Princess Peach. True to the "Galaxy" moniker, Super Mario Galaxy 2's gameplay is largely founded on gravity, or rather, the manipulation of it. Depending on the size of a planet, Mario can jump far enough to break orbit, and in some case, use gravitational pulls to solve tricky puzzles.
Super Mario Galaxy 2 also brings new power-ups to the familiar gameplay, including standouts like the Rock Mushroom and the Cloud Flower, just a couple mechanics that greatly expand the Mustachioed Marvel's natural talents.