Thread Count, 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
Almost every patch here lies flat, like threads on a loom. The 4 and 3 stacked in the top-right corner, the 3 on the left edge and the square in the bottom-right are all fixed from the start. The shape-only wide clue in the bottom-left is the interesting one: only it can reach that corner, and it grows into a 4x2 block to fill the space that's left.