The idea for the 16th puzzle has solidified. In this puzzle, parts that played a supporting role in other puzzles become the main characters.
Each puzzle has a caption board (an information board with a description of the artwork written on it). However, in Hepto game, no description on the caption board, and it is a switch to start the puzzle solving.
In this puzzle, this caption board is the subject of the puzzle. A lot of caption boards left in a warehouse like a featured image. The parts that are not art arework are the main part of the puzzle.