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 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 forced perspective, 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 them appear to be huge when on Tiny Island and tiny when on 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.
While the size of the islands differ, the layouts are generally the same, though some of the features are different.
On Tiny Island, the player starts in a small field with a Micro Goomba. 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 is 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 Big Steelies 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 is a Bob-omb Buddy that will open the cannon on 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 Big Steelies 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 Big Steelies are coming out of is a small field with Micro Goombas and a tiny Koopa Troopa. Due to its size, this Koopa Troopa 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 Huge Island, the player starts in a field with three Grand 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 Troopa on the beach, and a Lakitu that circles around both while throwing Spinies at the player. Across the lake is a Fly Guy and the course's cannon. The cannon can be used to reach the higher platforms, 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 Grand Goombas and a Shrinker Pipe, as well as the Goal Pole during the Rematch with Koopa the Quick mission. The bridge afterward has wind blowing across it and beyond it is a hill with Big Steelies rolling down it. Past the hill is the hole the Big Steelies come out of and two paths for the player to take: the right has a Shrinker Pipe and large platforms leading to the top of the mountain, while the left leads to a field with Grand Goombas, as well as Koopa the Quick if his mission is selected. Below the Big Steelies' spawning hole are the large platforms the player couldn't reach earlier, with the highest one containing several Piranha Flowers.
Statistics from Super Mario 64
1 - Two of the coins in the tiny island are underground near the box that releases Big Steelies, forming a coin slope that disappears into the narrower slope that forms the ground. The first one's hitbox is a little above the ground, allowing Mario to collect it just by passing above it. The second one was thought to be impossible to get for a long time. However, it was recently discovered that Mario can retrieve the coin by diving into the summit of the "tiny" island, where he would find himself swimming, and then jumping out of the "water" and diving towards the coin.
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