8 bits skelly and tiny skull locations

The text below exposes the locations of skelly and tiny skull!!!

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Skelly: Near Hole 4 behind a big folder

Tiny Skull: it's a 8 bits tiny skull on top of the helicopter

I'm quite sure that most people already found the green skull so didn't post it here.

For which course has those easter eggs you can confirm in my other post, if missing any course or have mistakes please let me know: