Crunch tiles are the tiles that can be destroyed by Ferazel's spin-jumping or his usage of fire seeds. In the "Tiles" menu, there are two items for editing crunch tiles: direction and tile kind.
Clicking once on a tile while in direction mode designates it as a crunch tile. Currently only the all-direction kind (the one with four arrows pointing outwards) is functional within the editor.
In tile kind mode, you can designate how much effort is needed to destroy a crunch tile by changing the number in the center: click repeatedly to change this number from 0 to 9.
(0) regular
(1) takes 3 hits
(2) takes a fire seed
(3) crunches under your feet
(4) requires the ice pick
Everything above 5 is unassigned and non-functional.