Click the cube to gain more cubes. But make sure you choose a difficulty first. E for easy, M for medium, H for hard, I for impossible, and U for ultra You have to gain a certain amount of cubes in 60 seconds for each difficulty. 120 for easy, 250 for medium, 300 for hard, 350 for impossible, and 400 for ultra.
Thank you @lightningjets for the size changing code for the cube.
