Drag a rectangle, or tap two opposite corners.
Starts with your first move. No time limit.
Every square has a home. Brilliant thinking.
Fill the whole grid with rectangles.
Made a mistake? Use Undo, or tap a coloured rectangle to remove it. For a nudge, use Show a hint.
The optional stopwatch is off to begin with. Switch it on to try for a personal best. Times stay on this device; using a hint makes it a practice attempt.
Keyboard: use arrow keys to move around the grid, Enter or Space to choose corners, and Escape to cancel a selection.
Your rectangles will be cleared.