Oh, then I probably didn't see the "twists" I was looking for due to the bug, I think I bugged out at level 3
It is not much of an twist, but the tetris mechanics sets in for the columns and leaves you less and less tiles that you can put on top of each other before they collapse again.
If you don’t mind, maybe check the install version. So far I only got bug reports for the Web version. I still can not reproduce it, though, it drives me crazy!