Capturing the essence of Jonathan Blow's Braid within a single sentence isn't the easiest thing to do, especially not if you want to avoid run-on monstrosities like: It's the game about a tie-wearing, time-traveling gentleman on a quest to rescue a princess, inconveniently held captive at the end of six beautiful worlds filled with all manner of puzzles which require fiddling with the flow of time to solve also it's really, really good according to reviews. So, let's go with "it's really, really good according to reviews" and leave it at that, eh?
IGN(88/100): "Xbox Live Arcade needs more games like Braid. Heck, gaming on all platforms needs more titles like this. Imaginative, innovative, and engrossing, Braid is a spectacular achievement. If only the experience lasted a little longer and there weren't as many puzzles with singular solutions."
Edge(90/100): "Braid remains a beautiful and brilliantly demanding game that barely contains its dense population of ideas, taking its place alongside Geometry Wars and Pac-Man Championship Edition as one of the finest original titles available on Live Arcade."
Eurogamer(100/100): "I've gone to bed thinking about Braid, and I've woken up thinking about it. From the fragments I remember, I'm pretty sure I've dreamed about it as well. Braid is that sort of game."