Super Happy Tree

You can land on the clouds that float on either side of the stage, but if you do, they won't hold up for long. Super Happy Tree (, Super Happy Tree), referred to as Yoshi's Island (, Yoshi Island) prior to Super Smash Bros. Ultimate, is a stage in Super Smash Bros., Super Smash Bros. Melee, and Super Smash Bros. Ultimate.

In Ultimate, it is renamed to distinguish it from the similarly-named Melee and Brawl stages.

Stage overview
Visually, the stage looks like it's made of cardboard. The main platform is an open book, and as such it has a V shape instead of being completely flat. Over the main platform hover three soft platforms; the bottom two slightly slope inwards, while the top one is flat.

In the sky surrounding the main stage float three clouds, one on the left side and two on the right. After standing on a cloud for about four seconds it will disappear; this can be prevented by repeatedly jumping instead of standing continuously on it. Disappeared clouds reappear after seven more seconds. s hover in the background above the clouds, but they have no gameplay effect.

Goonies and Fly Guys occasionally fly in the background, but do not interact with the players.

The version of this stage in Super Smash Bros.'s 1P Game is slightly smaller and lacks the clouds.

When the player fights False Yoshi in The Great Maze, the stage resembles Super Happy Tree, except the main platform is not shaped like an open book, and the colors and background are different.

In Ultimate, the side blast zones, especially the right blast zone, are moved inwards when the camera is set to "fixed". This includes Training Mode, where it is possible to position players close to the right blast zone, and set the camera to fixed, resulting in that player being KOd immediately upon closing the menu.

Ω form and Battlefield form
In Super Smash Bros. Ultimate, the main platform of the Ω form and Battlefield form is a completely flat version of the main platform of the normal form and is resized and reshaped to match and, respectively. The three soft platforms of the Battlefield form resemble the ones in the normal form.

Hazards Off
If hazards are turned off in Ultimate, the clouds will never disappear.

Origin
This stage is loosely based on , in which turns Yoshi's Island into a storybook and steals the. This causes the environment to be turned into various materials such as cardboard, yarn, and fabric. This stage is an amalgamation of the cardboard theme of the first level, and the fabric and cloth theme of the second and third levels ( and , respectively); however, the sky was colored blue in those levels, whereas, in this stage, the sky is light orange, giving it a resemblance to the first world's map screen, supplemented by rotating circular clouds behind the tree, which also appear on the first map behind a set of hills, albeit only in blue as opposed to the blue and orange of the Smash stage's rotating clouds. The Super Happy Tree is also in the background of the main platform. Yoshi's Story also features clouds that can be used as platforms, some of which have to be activated by pressing a switch and disappear when the switch's timer runs out; however, their design is different from the ones in this stage.

The storybook shaped base platform references not only the aforementioned plot element of Yoshi's Island becoming a storybook, but also the cutscenes and map screen of the game, which are styled like a pop-up book. At the end of each level, it would cut back to the map screen, overlaid by a giant Super Happy Tree heart face, rotating left to right like its animation in the Smash stage, and play a short snippet of the ending theme along with text describing the Yoshis' adventure in that stage in the form of a poem, before flipping to the next page, where a set of stages could be chosen, with harder stages accessible depending on the amount of Special Hearts eaten.

s appear in some and  games, and give hints to the player when hit. Also from the  games are s and s where they appear as flying enemies. The aforementioned elements are also based on their designs from Yoshi's Story and are seen in the background.

The Super Happy Tree itself appears in the final level, either the, , , or , during the fight with Baby Bowser. Within the story of the game, it is what grants the Yoshis of Yoshi's Island with their happiness - upon being stolen, all the Yoshis became depressed with the exception with 8 hatchlings, born mere minutes after the tree was stolen and protected from the spell by their eggs, who set off on a quest to recover it by eating fruit and spreading happiness. Despite being established in this game as a crucial piece of Yoshi lore, it has never appeared again in a Yoshi game, though the Sundream Stone in Crafted World serves a similar purpose, and it does cameo in Mario Superstar Baseball.

Tournament legality
Super Happy Tree is banned in every appearance, primarily because the clouds can promote camping. In particular, the rightmost cloud is very far from the stage and is a very powerful camping spot; additionally, some characters such as in Smash 64 are unable to make it back to the stage from said cloud. The cloudless variant from Smash 64's single player is sometimes legal in doubles, but as it requires modifying the game, it is rarely seen outside of specialized rulesets (such as ).

Spirit
The Super Happy Tree appears in Super Smash Bros. Ultimate as a Legend-class support spirit.

The Super Happy Tree can be summoned using the cores of, , a Neutral type, and two support types.

Trivia

 * In Smash 64 the background with the sun, clouds, and ocean remains still no matter which direction the camera faced, giving the appearance of a, but in Melee and Ultimate the background is rendered in 3D.
 * In Smash 64, eggs spawn on this stage instead of capsules.
 * This is the only stage in Smash 64 to have an orange background in Training mode.
 * Interestingly, the game's Stage Select screen is arranged in a checkerboard fashion regarding stage background colors, with all other stages featuring sky blue (with a lighter blue smash logo) or black (with a red smash logo) backgrounds. The Yoshi's Island icon lines up symmetrically with the Random Stage button, presumably for aesthetic purposes.
 * Yoshi's Island is the only Smash 64 stage to return in Melee, but not in either version of Super Smash Bros. 4.
 * Its theme, however, does appear on Melee's stage in.
 * Yoshi's Island is the only content from the series to have been unlockable, as it was unlockable in Melee.
 * Oddly, before November 10, 2018, the "Stages" portion of the Super Smash Bros. Ultimate Official Site in the U.S. updated this stage's name to "Árbol de la superfelicidad", its Spanish name. This error has since been fixed.
 * This stage and Halberd are the only stages to have spirits based off of them.
 * Oddly, in Ultimate, when a character puts up their shield while standing on one of the clouds and facing right, they will transition into their tumbling state once the cloud disappears.
 * In Ultimate, the Moon cannot be summoned here due to it interfering with the cardboard-style background. Also, Shadow the Hedgehog cannot be summoned unless the stage is played in its Battlefield or Omega form, so that fighters will not be unfairly trapped on the disappearing clouds during his time freeze. Additionally, Marshadow can only be summoned on the stage's Battlefield and Omega forms, while Lunala cannot be summoned here at all.
 * picks up wool blocks instead of dirt blocks on this stage.