Most Innovative Design:
Portal doesn't feature a new method of control, nor does it offer an arsenal of gadgets. Instead, it relies on just one gadget -- the portal gun. While teleportation is a gimmick in many videogames, Portal is perhaps the only one to build itself around this one concept and its (often nefarious) application. This ability makes walls, floors and ceilings the tools of the player, and makes the deadliest of traps go by with ease.