Braid, Anniversary Edition

World 4 is a unique world and, in my opinion, the coolest one. Time moves forward when you move right and reverses when you move left. The hardest part about this world is when keys also follow this rule and doesn't want to stay in your hands as you move left. Be aware and careful of that.

Below is a video showing all puzzle pieces in this world for reference in case you get stuck. Full credit to its creator.