Left and Right arrow keys to move the ball. It ends when you touch the edge.
This one was made about 2 weeks ago, but this was made in Scratch 1.4 (so exciting I know). Basically I messed up trying to make physics and this was the result, I thought it looked cool so I made it "3D", basically the 3D part is you just going around the central pillar, surprisingly convincing if you go fast enough. Also you can softlock this one by gaining and loosing momentum without it increasing/decreasing, making you stuck going back and forth. That's a lot of text...