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Indeed, It is also posted on mathematica.stackexchange.com with the same question name. I don't know if the answer is sufficient until I actually tried it, but you are welcome to give any tips about how to make people play my game on a website if...
Thank you so much Mr Rummler for providing exactly the function that is needed here. I thought for a while it was impossible to evaluate events dynamically within a EventHandler action/function, but FinishDynamic[] did exactly what I wanted. Thank...