Don't hold me to this, but I believe you get the new decks in this order:
Earth Deck : get to any level 7
Ocean Deck : get to any level 9
Sky Deck : any Level 10
btw the final levels are easy, they just have 99 hp
Mega points scoring, helps get awards for you: Just make sure you go around the planet the right way (p.s. that's a clever clue)
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