Grow one.
No, I mean it may be difficult as it's 4D and the players are not yet accustomed to the new control method, which uses 6 keys (WASD+QE). The 3D Beginner Mode (3D 新手模式) may be easier, as we are all accustomed to the WASD control method. Perhaps I should create a tutorial that transitions from classic pong to 3D and then to 4D in the next decade.