6-1 The Pit?
This is the last world to introduce a new game mechanic. A sign will tell you to press . When doing so, Tim will place a ring where he stands. Pressing again when standing close to the already placed ring will make Tim pick it up. Tim can only place one ring at a time.
As you might have noticed already, the ring slows down time of objects inside its radius. The closer to the middle of the ring an object is, the slower it moves. There isn't anything else to do at this level except to learn to use the ring feature, so move out the door when you feel ready.
6-2 There and Back Again
Let's try out our new-found ability in a real scenario. Like in 3-2 There and Back Again, a metal barrier is slowly descending to block off the path to the level's only puzzle piece. Tim cannot make it all the way up to the key and back to the gate before the barrier reaches the bottom under normal circumstances, but if the barrier would fall slower, he would. Place the ring right under the falling barrier and leg it for the key. Now there should be not problem getting the key and get back to the gate before it's too late. When you have the puzzle piece, move through the exit door.
6-3 Phase?
Above Tim there's a cloud bridge with a puzzle piece at the end. Climbing up and trying to jump between the clouds won't work; the gap between them is too large. Jump up on a cloud and use your ring. This will slow down the current cloud you're standing on and let the next one catch up. When you think you can jump over the gap, remove the ring and jump to the next cloud. Place a new ring on this cloud and repeat the process until you've gotten all the way to the puzzle piece.
Continue on and you'll find another cloud bridge not too dissimilar to the first one. The problem with this one however, is that the next cloud won't come out of the cannon until the previous one is destroyed; there can only be one cloud out of the cannon at a time. Ergo, waiting for a cloud to catch up to another one won't work. See the flower up on the ledge above? Place a ring on it and go back to the clouds. If you jump out on an oncoming cloud and then jump of it before it reaches its point of decimation, the power of the ring will slow down Tim's jump just enough that a new cloud will have time to spawn underneath him. When you land on the second cloud, jump over to the puzzle piece and grab it. That's it for this level; continue to the next.