Hey there!

If I'm understanding right, the secret to making green pieces smoothly flow between each other is to match up the blue handles that control the edge's curve.

For example take this downward-curved slope I made using two 90 degree curves and just moving the edges down:
https://i.imgur.com/Oi1cbhY.jpg
It's not terrible, but the slope isn't completely smooth. It flattens out a little bit in the middle.

The trick is to make sure the blue handles where the green pieces join line up in a straight line that follows the slope. So I took the blue handles on the left and raised them up by 2 notches (I have position snap on), and lowered the blue handles on the right by 2 notches:
https://i.imgur.com/dBzpKg7.jpg

A few more examples showing how matching up the blue handles makes for smooth curves:
https://i.imgur.com/lxj8W0A.jpg
https://i.imgur.com/2TcEBYS.jpg
https://i.imgur.com/wIxAWqL.jpg

And an example of mismatched blue handles:
https://i.imgur.com/jmYQPHF.jpg

Creating complex green shapes can definitely be tricky and can take some getting used to. For instance the Crystal Corkscrew hole on the Snow and Ice course took quite a while to get right.

Hopefully this helps!

- Kevin

Thanks a lot for your detailed answer!! I´ll definitely play around with that new knowledge...
I´m curious if I can also beat (or create) my final boss the tilted downward spiral now! :D
Thanks again and great game by the way.