This is the list of levels. By clicking on the name of the level, you can see a map of the level (if Google's "Upload Quota" isn't bypassed) and a walkthrough of the level, to help the people stuck. Items like the red, yellow, and blue keys are color-coded, and pink lines on the map make it clear where the invisible teleport lines teleport you to. Some invisible teleport lines teleport you to a identical room behind-the-scenes, and therefore, if there's room, I'll move the parts of the level to show the clear path.