Tiny-Huge Island

Tiny-Huge Island is the thirteenth course of Super Mario 64 and Super Mario 64 DS. It is located through the door to the left of Wet-Dry World's painting on the second floor of the Mushroom Castle. There are two paintings that lead to Tiny-Huge Island. The one on the left leads to the "Tiny Island," and the one on the right leads to the "Huge Island," with the painting in the center being decoration. The room with the paintings employs, which gives the illusion that all three paintings are the same size, when in actuality, the paintings and halls they are in are respective to the size of the island they will lead to.

Placed around the island are three special Warp Pipes, called Shrinker Pipes, that will adjust the size of the player's character, making him appear to be huge when on the Tiny Island and tiny when on the Huge Island. This feature is reminiscent of Super Mario Bros. 3's World 4-6 of Giant Land, where there are Magic Doors that change the enemies' sizes. Additionally, this is Koopa the Quick's homeworld.

Layout
While the size of the islands differs, the layouts are generally the same, though some of the features are different.

On the Tiny Island, the player starts in a small field with a Goombette. The doorway to the right is too small to go through, so the player has to jump to the platforms to the left to progress. On the first platform are a Keronpa Ball and a ! Block containing a 1-Up Mushroom, and the second platform includes a Small Piranha and a Shrinker Pipe. Next to the pipe is a Purple Switch that will cause blocks to appear, and the player can use them to get to a small floating platform or to get up onto the above ledge. The floating platform contains a single coin and a warp in a corner to get back to the main island. The ledge above has iron balls rolling down it, knocking the player back if they connect. Down the path to the left is a small bridge leading to a Shrinker Pipe and several platforms the player can jump across. Past the platforms are a Bob-omb Buddy that will open the cannon on the Huge Island and a body of water with a sloped beach and a small wooden bridge above it. In the DS version of the game, Klepto is circling the post in the middle. Back on the path with the iron balls and to the right is a Shrinker Pipe next to a series of platforms acting as steps to a bridge that leads to the top of the mountain. Beyond the hole that the iron balls are coming out of is a small field with Goombettes and a tiny Koopa. Due to its size, this Koopa does not give out a shell for the player to ride on, and it will be defeated after a single touch or even if Mario touches it.

On the Huge Island, the player starts in a field with three Big Goombas. The platforms to the left are too far apart and tall for the player to use, so the player has to go through the doorway on the right in order to progress. The doorway leads to a large lake and a sloped beach, with the lake having a Bubba that will try to eat the player, a Koopa on the beach, and a Lakitu that circles around both while throwing Spinies at the player. Across the lake are a Fly Guy and the course's cannon. The cannon can be used to reach the higher platforms, one of which has a bridge that leads to Wiggler's Red Coin cave. Past the cannon is a large platform with a strong gust of wind blowing through it, which will push the player off the edge if they are not careful. To reach the upper platform, the player has to jump in its direction, which will cause a gust of wind from below to appear and push the player upward onto the platform. Across the platform's bridge is Windswept Valley, which contains some Big Goombas and a Shrinker Pipe, as well as the flagpole during the mission Rematch with Koopa the Quick. The bridge afterward has wind blowing across it, and beyond it is a hill with iron balls rolling down it. Past the hill are the hole the iron balls come out of and two paths for the player to take: The left has a Shrinker Pipe and large platforms leading to the top of the mountain, while the right leads to a field with Big Goombas, as well as Koopa the Quick if his mission is selected. Below the iron balls' spawning hole are the large platforms the player could not reach earlier, with the highest one containing several Piranha Flowers.

Statistics from Super Mario 64

 * Total Number of Coins: 192, (158 on the Huge Island, 34 on the Tiny Island)
 * Caps Found: (none)
 * Spinning Heart: (none)
 * Cannons: 1
 * 1-Up Mushrooms (10):
 * Homing Mushrooms : #1 In the only tree near the entrance to the Red Coin cave on the Huge Island.
 * Static Mushrooms : #2 On the Huge Island, underwater by Bubba right near the starting point. #3 In the Red Coin cave, on a pillar.
 * Triggered Mushrooms : #4 Triggered by collecting the two coins on the beach on the Huge Island.
 * Box Mushrooms : #5 On the Tiny Island, to the left of the starting point on the platform by a Keronpa Ball. #6 The corresponding location of #5 on the Huge Island. #7 On the Huge Island, on a ledge by Windswept Valley.
 * Butterfly Mushrooms : #8 Obtained from one of the butterflies near the only tree on the Huge Island. #9 Obtained from one of the butterflies in the fenced area near where Koopa the Quick starts. #10 On the Tiny Island, from one of the butterflies near the starting point.
 * Warps:
 * From the small floating island while on the Tiny Island, the player can warp to near the Small Piranha and the ! Switch. This warp is one-way only.

Trivia

 * The painting of Tiny-Huge Island is present in the foyer of Peach's Castle, in the entrance to Super Nintendo World. If it is looked at from a different angle, the Big Goomba morphs into a picture of Bowser Jr. holding his Magic Paintbrush and Peach's Golden Mushroom in his Junior Clown Car.