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Hello, I have a simple question. How do I add the green arrow on a condition (which will make the event trigger only once)?
You can use the "System:Trigger once while true" action. This is separate from the "green arrow".
Yeah, but, what if I wanted to use the green arrow, instead of the "Trigger once while true"? How would I do that?
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You can't make something a trigger - it either is or it isn't. https://www.scirra.com/manual/75/how-events-work