This project designs and implements a virtual three-dimensional space (3D) in the development platform Unity, using LeapMotion somatosensory equipment, and manipulating the project elements of the three-dimensional space (such as glass body, reflective prism, solid block, etc.) through fingers, so that it can correctly trigger the correlation response to the light emitted by the light source. The project has designed game teaching levels and a variety of levels from easy to difficult. The goal is to enable light to smoothly pass through the project elements in the level and guide the light source from the starting position to the ending position to complete the customs clearance. The three-dimensional space decryption game screen production is exquisite, the game mode is very interesting, through the finger somatosensory interaction form, so that users get a comfortable experience.