1. Some of the green squares have to be crossed 2 or even 3 times. Actually, we've seen this before.
2. Purple wormholes. We've seen this too.
3. Yellow squares. When passing over a yellow square, it will turn green and move to a new spot. This we've never seen before!
4. Starting at level 57, some green squares turn black temporarily, so you have to time your path.
5. Starting at level 65, the stripped green squares travel along an invisible track.
I thought level 55 was pretty tough. After about 10 attempts, I had my 'aha' moment.