Velvet Corners, 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
Four clues have only one possible patch from the start: the 6 down the right edge, the two squares, and the 4 running down the left side. Between them sits a small stack of horizontal pieces, including a shape-only wide clue that the square beside it boxes into just two cells.