: Take the top-left corner and fold it down to the bottom "door" edge. Take the bottom-right corner and fold it up to the top "door" edge.
This project uses the method, which creates a sturdy paper cube that "zips" together without glue. What You'll Need: Part 3- Twiszip
If "Twiszip" is a character from a story or a specific step in a complex model (like a 3D puzzle), please share a few more details so I can give you the exact steps! : Take the top-left corner and fold it
: Flip the piece over and fold the two pointed ends inward to form a perfect square with two flaps on the back. Repeat : Do this for all 6 pieces of paper. Assembling the Cube ("Part 3"): Take one unit and hold it so the "pockets" are facing you. What You'll Need: If "Twiszip" is a character
Continue "zipping" the units together until you have a 3D cube. Each corner should have three units meeting, forming a stable "twist."