third time playing and it's still a treat. use time to manipulate the world around you through several areas, each one introducing a new mechanic to play with. some of the later puzzles had me staring at my screen wondering how to solve it, but it always feels great to get that "aha!" moment when i finally figure it out.

i didn't know going in, but you can toggle between the original and updated graphics (x on keyboard, or right joystick button). i wish i knew about that earlier in the game, but you aren't told until you visit the commentary levels. speaking of the commentary, there's a ton to look at and and listen to there. the store page says there's 15 hours, which is longer than it takes to complete the game itself.

this is a must-play for puzzle lovers.