I want to put traps on a random platform, but I'm a little stuck, I can do them appear but not on the platform: /
I'm thinking you could actually set the platforms themselves to spawn the traps. Maybe you could have each platform generate a number on start of layout and if that number falls into a certain range a certain kind of trap is spawned along the platforms lowest y value at a random X value.
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You could create a spawner sprite on each platform. Set them invisible. Then pick a random spawner and spawn your trap at that location.