Clean Fold, a 6x6 Patches puzzle
Arrow keys move. Enter starts a rectangle; arrows resize it; Enter places it. Escape cancels. Delete removes a patch. Control or Command Z undoes.
About this board
The top edge is generous: the square in the corner and both tall 4s are fixed from the start, as is the wide 5 along the bottom. The tricky part is the wide shape-only clue low in the middle, which has eighteen possible patches at first. It is settled by elimination, because every other version would leave one of its neighbours with nowhere to go.