Secret Star World is the secret world in New Super Mario Bros. X-treme. It has the hardest levels in the game.

9-1: Rolling Nighttime

9-2: Deserted Temple

9-3: Waterspout Clouds

9-4: Slippery Road

9-5: Jungle Vines

9-6: Brick Block Canyon

9-7: Lakitu's Cloudy Crushers

9-8: Chaotic Palace

9-9: Champion Road

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