The Princess's Secret Slide
The entrance to the course is in a room of the Mushroom Castle, behind the door marked with a "1" on the mezzanine. Inside the room are three stained glass windows with images of Princess Peach on them. Jumping into the one on the right will lead to the slide. In the DS version of the game, the room is expanded to include the locked doors with the other characters behind them, and the number of stained glass windows is reduced from three to two, but the stained glass window on the right will still lead to the slide. The level is also used as one of the four courses in VS Mode.
The player starts in a room with a Blue Coin Block to the right. Once the player enters the slide ahead, a timer will begin. The slide will first take the player down a large tunnel, which leads to a steep downward slope. After a large 270° bend are a series of drops with a 1-Up Mushroom in this area followed by several bends, ultimately leading to the end room of the slide. If the player falls off the slide, they will be brought back to the lobby of the castle, with no lives lost. In the Vs. Mode course, the first Power Star can be found at the start; the second is in the middle of the slide, and the last three Power Stars are in the ending room.
This secret stage has two Power Stars to collect, and it is the only stage in the original game to contain two of the castle's Secret Stars.
The player must ride the slide all the way to the bottom and hit the ! Block to collect the Power Star.
This second Star will only appear if the player reaches the bottom of the slide in under 21 seconds. This Star will appear in front of the ! Block that contained the first Star.
The music that plays in the course is a variation of Bob-omb Battlefield's theme (also the main theme of the game), as well as Cool, Cool Mountain's music, involving a Western style, with an instrumentation of a harmonica, a bass, drums, a banjo, and a whistle. This music can also be heard during the races with Koopa the Quick, and in most other secret courses, in secret areas that involve a slide, and in other regular courses such as Tick Tock Clock and Rainbow Ride.
This music has since been arranged in multiple future titles in the Mario franchise, including the Super Smash Bros. series; Super Mario Galaxy 2 in the Tall Trunk Galaxy mission "Tall Trunk's Big Slide" and in the Rolling Coaster Galaxy; Paper Mario: Sticker Star during the mine cart sections in Bowser's Snow Fort; Super Mario 3D World while riding Plessie, which was reused in Captain Toad: Treasure Tracker during part of the Coins Galore minigames; Mario & Sonic at the Sochi 2014 Olympic Winter Games and Mario & Sonic at the Rio 2016 Olympic Games as one of the tracks that can be played in events, which is Toad's theme in the latter game; and in Super Smash Bros. Melee and Super Smash Bros. Brawl as the main track for the Rainbow Cruise stage, combined with the Underwater Theme from Super Mario Bros. The original song is also featured in Super Smash Bros. for Wii U, Super Smash Bros. Ultimate, and Super Mario Maker 2.
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