@chunkmassuhflex Weird they used to have a Criterion page like the other side brands of DC, Crunchyroll etc. But looks like it's gone now. Searching Criterion still seems to bring up stuff from that subset.
In order to unlock those hidden potentials you need to instruct them in it during the classes. Usage wont help it. In fact they'll learn at a pretty slow rate from usage and study in it until you get all three stars filled from instructing them.
The damage you do is based on the speed of your boulder when you hit the door, but it's not too tough to get up to max speed shortly before the door. But it's also determined by the health of your boulder which drops every time you fall off the course or take hits from canons explosives etc. The more damaged the rock, the less damage you do to the door. Explosives are good at doing damage as a defense if they run into them, but they are also sort of a one shot use defense.
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