The Princess' Secret Slide

The Princess' Secret Slide is a hidden level that can be found in Super Mario 64. It is found by entering a 1 star door in the First Floor of Princess Peach's Castle and jumping into a stained glass window in the right wall of the room. There are 2 stars in this level, both considered Castle Secret stars.

Geography
The Princess' Secret Slide starts in a room with red carpet and grey brick walls and a roof. There is a sign and a path that leads to the slide. The slide is a long orange slide that twists downwards to a second room similar to the first one, this time with a platform with a yellow ! box that when broken, reveals a star.

Star 1
The first star in The Princess' Secret Slide is collected simply by reaching the end of the level.

Star 2
The second star in The Princess' Secret Slide is collected by reaching the end of the level in under 21 seconds.