Do you have any ideea or an example how to invert gravity in construct classic?
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For the physics behavior set gravity to disabled and manually apply a force with events in whichever direction you want.
For the platform behavior you can use the "set gravity direction" action.
I think you will have to rotate the character from the script. Reversing gravity will make an object "fall" upward, but there's no particular reason why it would spin around so that its feet point towards the floor.