D
Deleted User
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Title. If you want to make courses with stone/other parts in them, just load a story mode level on 1.0. There will be no corruption. Here's a screenshot of a level with a toad in it in editor. I don't have a picture of stone because i don't know the level id, but i can confirm toads and toadettes cage are corrupt on 3.0, but work fine on 1.0. So i'm assuming stone is the same.
This is level "117"
This is level "117"