In the Psi Practice Room, you can practice all sorts of powers and tricks.
It has many buttons along the walls. When you push them it makes an enemy. If the enemy dies a new one appears. It includes:
It contains many objects.
It contains many blue boxes for you to climb on. Some are stacked to be higher.
It contains many crates both wood and metal.
It contains many barrels.
It has a tank full of flammable liquid. It explodes if hit by fire.
The room has a giant ball in it. Enemies die on impact with it. There is also a second one attached to the cealing by a chain.