> You can also check for an overlap at offset.
> If player platform is overlapping jumpthru at, X=0 Y=4 (for instance) then (whatever action you're hoping for)
Yup that works too but I was thinking if you create an invisible sprite to check overlap you could use it for many platforms that might be at different positions on the screen so no writing additional events to check overlap at offset.
It is just something I use a lot in platformers and blank sprite triggers are very convenient.
I get the feeling code will be necessary regardless. I suggested the overlap at offset to avoid collision checks. Whatever's clever though - if it doesn't impact performance for OP then it's moot.