Corner Stitch, a 5x5 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 5 on the right edge can only run the full height of the board, and the tall 3 low in the left column has exactly one home. Once those stand, the wide 4 claims the rest of the top row and the 6 squares off a 2x3 block at the bottom, leaving clean slots for the last 3 and 4.