1. Pull it out of the institute, and a huge ball will open, go in and go to the end (it will feel the end);
2. Then pull out the invisible ball as before;
3. Then go back to the cornfield and open it in the order of "Up, Up, Right, Left, Right, Up, Right, Left, Zuo Zuo".
Extended content:
Inside is an adventure decryption game produced and distributed by Playdead Studio, which developed Hell Boundary. The game looks a bit like a combination of Hellscream and Death Ray. Players operate a little boy, while avoiding all kinds of enemies and solving puzzles again and again. The game is a horizontal version, and the whole game belongs to the apocalyptic style, which is very dark and strange.
Compared with Hell's Boundaries on Xbox360, this picture is 3D with more colorful colors, but the overall operation is exactly the same.