Dunno what I'm doing wrong but I got up till level 11 and got as many tetrises as I could in a row sometimes if I'm lucky I could get 3 but the pictures don't uncover?
Yeah you have to activate it :^)
It is the sexy key that do the trick, or by hitting pause and clicking the bottom left square of the pause screen.
The sexy key is 'L' by default but can be changed in the start-up "TETURSS Configuration" screen in the "Input" tab.
Hope it helped :^)
sneaky sneaky