Refer white dot objects as reference angle with action 'set angle towards position'. You will likely pick dot object ahead purple box each time the box reach a dot on it's way. As the consequence at least "counter" variable required.
like this
i can't understand counter variable where to set
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It needs proper picking condition based on dot UID or IID. If you trying to create drawing route, there is already tutorial for that. Please check following page:
construct.net/en/tutorials/writing-game-959