How to Unlock World 9 – Superstar World / Secret Island
Once you manage to complete World 8 in New Super Mario Bros. U Deluxe you will unlock the bonus world 9 which is the Superstar World that also includes the Secret Island which you will be able to find between Sparkling Waters and Acorn Plains.
To unlock each individual level in Superstar World you will need to collect the required number of Star Coins. The Secret Island features the Records Toad House which will enable you to see how many coins you have collected and your personal best records whilst playing the game.
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