Make daring leaps from ledge to ledge to the top of each highrise building.
Confront the alien menace before their plans for enslaving Earth can become a grim reality.
Ragdoll physics that don't always do what you want.
Running out of oxygen just when you thought you had made it.
Collectible boosts that can save that missed grab or power leap you to the top.
An endless map of challenges to overcome.