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To have unlimited use of the mushroom house, you must successfully complete the Star World. To unlock this mode you will need to complete the Castle Level in World 1 to unlock the Money Rush Mode. Secret Rainbow Level in World 6: Jump on the flagpole when the timer ends with 66. Secret Rainbow Level in World 5: Jump on the flagpole when the timer ends with 55. Secret Rainbow Level in World 4: Jump on the flagpole when the timer ends with 44. Secret Rainbow Level in World 3: Jump on the flagpole when the timer ends with 33. Secret Rainbow Level in World 2: Jump on the flagpole when the timer ends with 22. Secret Rainbow Level in World 1: Jump on the flagpole when the timer ends with 11. Secret Rainbow Level in the Star World: Jump on the flagpole when the timer ends with 99. Secret Rainbow Level in the Mushroom World: Jump on the flagpole when the timer ends with 77. Secret Rainbow Level in the Flower World: Jump on the flagpole when the timer ends with 88. When you return to the world map, the entrance to the secret Rainbow level will appear at the entry point of each world. If done right, you'll hear level-completed original NES music followed by gunfire and fireworks. The rainbow paths are secret levels, to unlock these secret levels you will have to jump on the flagpole when the timer ends with the numbers indicated (found below).