Ice Age 2: The Meltdown is the second
Ice Age movie from the point of view of Scrat. As the little acorn-hording squirrel-rat, you will run around gathering nuts, swimming, gathering nuts, attacking animals 10 times larger than you, and gathering nuts.
In each level, you will run into many of the characters or species established in the films - some of these will be good and helpful, while others will attack you. Scrat isn't totally defenseless, though. Not only does Scrat have a few attacks, like spinning real fast and hitting enemies with his tail, but he can also throw pebbles to knock opponents out.
But The Meltdown is more than just an action-platformer. Frequently scattered throughout levels are mini-games that Scrat or one of the other main characters will have to complete in order to progress in the level and/or story. For instance, in order to get out of a cave, Scrat must have some bats scare a large animal out from the exit. Scrat does this by watching which bat has one of his nuts and choosing that bat after they all fly around in circles (a la The Shell Game).
Another mini-game has Sid sliding down a long ice-ramp collecting acorns, going through check-points and performing complex aerial acrobatics. Once you earn enough points in this mini-game, Scrat takes back over and you are running around beating up enemies and collecting nuts (again).
As you progress through the game, you will also unlock six different interviews with the various cast and crew members of Ice Age 2 (the movie and the game). Interviews include Chris Wedge, Ray Romano , Denis Leary , John Leguizamo, Josh Peck and Alan Tudyk (Cholly, though you might also remember him as Wash from Firefly and Serenity).
Though the gameplay hasn't really changed with this port, the differences in the game's controls really makes for a different feel. By relying more on gestures, The Meltdown gets you just a little more involved in the game, but more about that in the Game Mechanics section below.