Scratch has a list limit of 200K, but if you use Turbowarp, export a list that's bigger than 200K from there, then import it into scratch, then you can have a list bigger than 200K items on scratch. The tradeoff of doing this is, is that you can't add new items to the list. The "add to list" block won't work, and the "insert thing at" block still works, but the bottom-most item of the list will get deleted. All other blocks still work though, including the replace one.
