Energy Balls

Each ball can be in one of nine states depending on its energy level, from the almost immobile light blue to the fastest moving red.

When balls make contact, energy is transferred from the higher energy ball to the lower energy ball.

Balls can be changed to low or high energy by selecting the corresponding paintbrush, and clicking or pressing in the box.

The behaviour of the balls hitting each boundary can be adjusted, so balls can gain or lose energy.