Keep the ball of energy contained inside the octagon for as long as you can, score points by allowing the energy to hit the white walls, these move around once hit. Avoid hitting the red walls as these deduct points, if your score is below zero the energy will shrink making it harder to contain, and if you don't bring your score up it will disappear completely.
[DOWN] – Start game[WASD keys] AND [Arrow keys] – Form barriers[E], [N], [H] – Change Difficulty (easy, normal, hard)[R] – Retry