THIS PROJECT DOES WORK ON MOBILE (you read that wrong, you thought it wouldn't work on mobile) i don't know who started this trend, but I made it. Just watch the cubes fight, as every time two cubes touch, they both take damage. But the boxes fighting thing trend usually has power-ups. The rainbow (made with the colors of the 4 cubes, alternating as the filling, to the outline), spinning, cubes, make the cube that touched it invincible for 1 collision.
Please find out who made this happen. Also I'm released a version where you (yes Bradley, that means, according to the Oxford English Dictionary, "you") can turn the cubes with your keys (not for mobile), with 1-4 players. Here it is: https://scratch.mit.edu/projects/1114681698 If someone finds the REAL keys to setup for 4 players (I have the other 3 setups) please tell me.