Apple

Apples are a variety of fruit that appear in many Mario games. They have had many different uses throughout its many appearances.

Yoshi's Story
In Yoshi's Story, Apples are the Red Yoshi and Pink Yoshi's favorite fruit, along with Melons.

Yoshi's Universal Gravitation
Apples had a rather large role in Yoshi's Universal Gravitation, where Bowser turned all of the Egglings into Apples when they fled to Yoshi's Island after the Koopa Troop's attack on their homeland. The Spirit Who Loves Cuteness, who was a friend of the Egglings, was dumbfounded at this tragedy and enlisted Yoshi to seek out the Apples and eat them, which would lift the curse upon the Egglings and restore them to their initial forms. The Apples in this game came in two colors, red and green, and, while the two colors of Apple could be found doing anything regardless of any kind of coloration code, green ones typically stayed in one spot and most red Apples glided downward on parachutes.

Yoshi Touch & Go
Apples also appeared in Yoshi Touch & Go, which Yoshi can eat. They each only give him one egg.

Paper Mario
In Paper Mario they are a cheap item only found in Boo's Mansion. One is able to find Apples by simply Spin Jumping on various crates in the cellar of the mansion. They heal five HP, but are better put to use in cooking. Only a limited number could be found in the game, making them extremely rare. If a player wished to complete the recipes, strategic thinking was required.

Super Paper Mario
Super Paper Mario brings Apples back; however, in the game, there is no such item named "Apple". There only is an item named Red Apple. Also, this game introduces new kinds of apples, including the taboo Black Apple, the luscious but cursed Golden Apple, the mustache-inducing Yellow Apple, the fruit-transforming Pink Apple, and the shrinking Blue Apple. (It is interesting to note that all varieties of Apple in this game simply restore five HP, except for the Black Apple, which restores only one, when used on a playable character; the above ailments are induced only when they are given to a non-playable character.) The more-useful Primordial Fruit introduced earlier in Super Paper Mario also slightly resembles that game's Apples, although the two items' exact relations are unknown.

Mario Party 2
In Mario Party 2, apple is one of many fruit that appear in the minigame Honeycomb Havoc.

Super Smash Bros. Melee
Apples also appeared in Super Smash Bros. Melee. They occasionally fell off of Whispy Woods in the Green Greens stage. They could be thrown at other players to damage them. A smaller variety appears as Food; these Apples can heal 5% health. The apples don't appear anywhere else in the game, however; they don't even appear as a Trophy.

Donkey Kong: Jungle Beat
Big Apples appeared in the Apple Kingdom of Donkey Kong: Jungle Beat. At the end of each Apple Kingdom level, there was an oversized Apple (two times bigger than Donkey Kong) that DK needed to eat.

Super Mario Galaxy
In Super Mario Galaxy, three Apple Planets appear in Gusty Garden Galaxy, and are habited by Flipbugs, Boulders and some Wigglers. For progressing, Mario must Ground Pound the correct wooden pegs on each Apple Planet in order to make a giant green worm burrow through each of the three planets.

Mario Sports Mix
Apples appear in Mario Sports Mix, in the basketball minigame called Feed Petey, and give the player 30 points if he shoots one of them in Petey Piranha's mouth.

Trivia

 * The fruit found in Super Mario World, New Super Mario Bros. Wii and Super Mario Galaxy 2 were also referred to as "Apples," but are more commonly known as "Berries".

Super Paper Mario Apples

 * Black Apple
 * Blue Apple
 * Pink Apple
 * Red Apple
 * Yellow Apple
 * Golden Apple