When a coloured square has a black outline, it means you can buy it. Clicking a square will summon a box that will have a better 'cost:profit' ratio than the last but will take longer to 'deliver'. When the '+1' button turns green, you can click it to increase your max boxes on screen by 1.
Share : https://scratch.mit.edu/projects/138236305/#fullscreen All by me @ItsASpaceThing
