How do I fix my EdgeMarker

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It would make more sense for you to provide a link to what you've done. That way, we can hopefully pinpoint where you may have gone wrong and offer more direct help.

Just snapshots may not be enough - especially if it's a problem with the collision polygons, for example.

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The problem with your shooter is, that when the health is smaller/equal 0 you spawn your explosion in every bullet on the screen. There is now way that Construct know which bullet had hit your monster.

If you put the health event as sub-event, that bullet would be picked that hit the Monster.

The link of the platformer shows your picture again.

Helpful, thanks guys