If you win in a level, and then go to the latest level and immediately exit to hub, the next level will unlock. This means that you can play level 1 seven times instead of playing every level. I was going to do a couple runs trying to use it to get a good time but it feels like more hassle than its worth. I'm dubbing this useless-and-most-likely-slower-than-normal "skip", the Solo Skip. Here is a REALLY bad run i did to test the concept.