Sunroom Start, 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
Both 5s sit in top corners of a five-row board, so each can only fill its own edge column. That leaves a three-wide gap in the middle: the three 4s on the bottom row rise as columns, and the 3 caps them across the top. A clean first solve for seeing how corners and edges limit a patch.