The foldable and slidable screen can double its size and, through a special magnetic mechanism, it allows two users to play multiplayer games on a single device, essentially fusing two Z Flip models against each other.
https://www.notebookcheck.net/Samsung-publishes-patent-depicting-a-folding-and-sliding-smartphone-that-can-transform-into-two-Z-Flip-models-fused-against-each-other.607504.0.html