North Window, a 8x8 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
An 18 in the bottom-right is the giant here, a 3x6 slab fixed from the start, along with the squares in the top-right and bottom-left corners. The top two rows split into a wide 8 and two 2x2 blocks, like the panes of a window. Below them a 10, a 5 and an 8 drop in as columns, with a wide 3 tying them together.