Oh I see I hadn't had that issue when I made it I apologise! There should have been something that said click to start I'm guessing clicking that didn't work?
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I see I've found that this is an issue with Scratch for some reason that the button works sometimes but not 100% which is quite annoying. Though it normally works the first time it's used. Though I do believe I have now fixed this issue you will just need to re-download the game. As I had to make some changes to the coding.