if he was going to take out a star it'd be ttc 100 coins. but the 70 star rules are simply beat the game as fast as possible WITHOUT BLJ. otherwise he could also save time by doing Bowser in the Dark World first and then getting the island star in BOB with the Wing Cap, which is faster than wall-kicking to it.
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My rivalry with SuperNiceDog turned out a bit one-sided.