Click and hold the mouse to make a square, press the button in the top right (the buttons only show if your mouse is near the right edge) to toggle empty/filled square. Hold “s” while drawing a square to make it a perfect square; release it to not make a perfect square. Press “z” to undo what was last drawn; press “x” to redo. Click the save button to save what you have drawn, click the load button to paste a save code. Feel free to add suggestions in the comments :) Everything by me!
