Move your mouse. Don't get hit.
Yeah, there is a way to cheat. Yeah there is a bug or two. Yeah the code is a mess. I did this in an afternoon, trying to see if I could get past the clone limits since I already needed global collision tracking for clones. I got to 2500 'clones' moving on the screen together without lag (and 10000 with 350ms lag) which is better than the 300 real clone default limit so I turned it into a quick demo game. In the end I have fewer than 300 clones on the screen at any one time so you COULD do this the normal scratch way and the code would be a ton simpler but like I said, it is a demo/playground of rendering I may use in the future.