The professional edition makes it easier to draw pixel art with new features left/right arrow keys – choose a colour (go to edge for eraser)left click on palette – choose colourright click – eraseleft click white bar – select eraserbackspace – restart[1], [2], [3] – choose grid[4], [5] [6] – set tile opacity [7], [8] – show/hide tile number[9], [0] – select big or small brush