Level 56!
I get that you don't want people just restarting from levels trying to get a perfect score.
Perhaps a limited save. Something where you get a save but once you re-start the save "poof" that save is gone forever.
Found another small "bug". Had a 12 terra pool (which you should get a joker for) and a 10 green pool (which says you get a joker for) and only got one joker. Just an FYI
For people who can't get to 30. It's a hard badge. It's not easy to get to. Once you start getting up near 30 though they start giving you transform tools so it should be a bit easier. That said you NEED to have some jokers and blue bombs you have earned from the easy first few levels (use your draws to form terra pools!).
If your ring wasn't strong enough you made a mistake in your matches (I wish they would show you where you were stupid though so you didn't have a nagging feeling the game was wrong).