@ nield; the tokens are hidden. There are five of them, but I only found two : the one at the base of a flowerpot to the right of the statue that says "be the witness of your thoughts", and the one in a huge crack between the window at the top of the spiral stairs and the room with the four portal switches. You use the tokens in a place you reach by going down asap once exiting the pod, then left (you must pull a lever in a room above).
For level 11, go all the way to the right and stay on the button for about ten seconds. Then, return to your pod. For your next instance, stay on the lift until it stops at the top. Then grab the box to your left and put it on the lift. Jump on top of the box, then jump as high as you can and land on the left side of the see-saw (which MUST be up) and return to the pod. Lastly, stand on the right of the see-saw and wait for the last instance to land. Then, hold to the right so you land on the platform. Return to the pod.
for level six, go under the block in the middle and (1)shoot a portal at the bottom of the box,(2)shoot a portal under you,(3)pick up speed,(4)shoot a portal between the red circles and hold to the right arrow key(or "D")
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