Wait, what is the float expression? How do I use it?
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Also, with this float thing, do I use it in a separate event or put it in the same one, and if I do how do I implement it?
I've no idea how to use the left or float expressions.
You could refer to the manual on expressions and system expressions.
construct.net/en/make-games/manuals/construct-3/project-primitives/events/expressions
construct.net/en/make-games/manuals/construct-3/system-reference/system-expressions
Recommend you go through the beginner tutorials as well.