A method of playing the stage using the natural principle that shadows are generated by light and objects.

A stage consisting only of black, white, and gray. In the curse where the light disappears, the game is played with the cooperation of the only light, the fox fire and the master.

Play the stage in various ways with the creativity and concentration of the player in situations where the angle is restricted by the characteristic of light that proceeds only in a straight line and the object cannot pass.

High-level stage play using items that enhance character's stats, items that temporarily remove light restrictions, and the principle that light is reflected and refracted by a mirror.

Play while creatively avoiding and defeating monsters, traps, and obstacles that threaten your character