Found this level when going through Insendium's old levels. At first, I thought it was completely random which paths you're supposed to pick, but then I realised that it actually tells you the paths a bit earlier on, and you have to memorize it! It's like that one part in Dark Travel, but done several updates earlier. The structuring is also pretty neat, as is typical of Insendium, and I'm assuming the name refers to what you'll be feeling as you try to remember the up-down patterns. There's a really good progression where the patterns get longer and longer, and it even throws you a curveball at the very end. Really good and highly underrated level, wish it was rated.