Definitely inspired by Portal, but unique enough to stand on it's own. Don't expect the same level of challenge as those games though. Super trippy at moments, especially towards the end.

Dumb fun.

First game I ever preordered. I love Uncharted 2 and 3, but the narrative in this one is leagues above those games. Graphics were stunning. Action is incredible, and it still has one of the best grappling hooks in gaming.