Maybe someone can give me a hint on how to manage this room in the toy dungeon (see attached pictures).
With that soft pistol, i can switch between red and blue walls, and I think, I have to put the crystal obto that pedestal.
I did not yet discover the function of those handles. Maybe it's easy as pie, but I do not see the point....

Got it!
In the blue scene, just throw the crystal to the left. Throwing is done by pressing "A" during movement.