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Small Mario (formerly referred to as Regular Mario or just simply Mario) is the weakest form of the player character in the main Super Mario games. This form does not have any special abilities, and it also does not take any power-ups to assume this form, unlike other forms. Super Mario turns into Small Mario when he is hit by an enemy or obstacle. The player almost always starts the game off in this form (Super Mario Bros. 2, Super Mario 3D Land, Super Mario 3D World, and Captain Toad: Treasure Tracker are notable exceptions).
Any damage taken in Small form will cause Mario to lose a life. Usually, before being able to assume even stronger forms, Small Mario first must become Super Mario by eating a Super Mushroom. In Super Mario Bros., Super Mario Bros.: The Lost Levels, and the original and Super Mario All-Stars versions of Super Mario Bros. 3, if Small Mario gets a higher-tiered power-up (like a Fire Flower), the power-up will only turn him into Super Mario, but as of Super Mario World, this was changed so that, for example, grabbing a Fire Flower will turn Small Mario right to Fire Mario.
In Super Mario Bros.: The Lost Levels, Super or Fire Mario can also become Small Mario by touching a Poison Mushroom. Being Small Mario can sometimes be useful; in some games, like Super Mario Land, there are small crevices that can be reached only with Small Mario.
This form also appears in most other 2D Super Mario games with the same effects.
In Super Mario Bros. 2, Mario, Luigi, Toad and Princess Toadstool start out each life in Super form (at the start of each level, they only have two hit points; they start with the current maximum hit points full after defeat), regardless of what their form was upon defeat or exiting the previous level. They become small if they only have one hit point left. By finding the two Mushrooms hidden in Subspace, Mario can extend his maximum hit points to four; also, upon the Mushroom's collection, the character always regains full health. In Super Mario Advance, however, the Small form persists between levels (unless the player finished the previous level in their Super form, in which case it transfers to that level for that life only, even if the player switches characters), and the characters start the game in their Small forms with only one hit point remaining (of the current maximum) rather than their Super forms (with two hit points), and is the starting form for each life (as in the other 2D Mario games and unlike the original and All-Stars versions), and the maximum hit points per level is five, due to an added Mushroom per level. In the original NES version, when characters are in their Small forms, only their lower half shrink while their upper half remains intact. In the All-Stars remaster, this was changed so that their entire bodies shrink. As a result, Peach is also affected as her hair becomes shorter as she shrinks into her Small form rather than remaining intact like in the original NES version.
Bowser was also turned small in the ending of Super Mario Galaxy 2, possibly as a side effect of using the power of the Grand Star's to make himself giant. When in this form, he could be jumped on by Mario and Yoshi, and could be hit by Yoshi's tongue.
In Super Mario 3D Land, Small Mario makes its 3D Super Mario debut, as previous 3D Mario games had a health meter. In this form, Mario and Luigi lose their caps, making this form similar to Wario's Small form, as seen in Wario Land: Super Mario Land 3 (unless the player collects the maximum amount of lives (1,110 lives), which has Super Mario/Luigi lose the cap instead). Their voices are also higher-pitched. However, like in Super Mario Bros. 2, Mario and Luigi start out each life in their Super forms. Additionally, in Super Mario 3D World, Peach, Toad, Rosalina, and Captain Toad can also get affected by this transformation, which works as it does in Super Mario 3D Land. As such, Peach and Rosalina's hair gets shorter, and the Toads' cap colors are reversed.
Captain Toad and Toadette's Small forms also appear in Captain Toad: Treasure Tracker, retaining the features from Super Mario 3D World (including the reversal of cap colors and higher-pitched voices). However, as in Super Mario Bros. 2 (original and All-Stars version only), the Small form does not persist between levels; every level is started in Super form, regardless of what form the previous level was finished in.
A similar form known as the Tiny status effect appeared in Paper Mario and Paper Mario: The Thousand-Year Door. This state could be inflicted by Hammer Bros. in the original and X-Naut PhDs and Bonetail in the sequel, or given to enemies by using a Shrink Stomp badge in both games, a Mini Mr. Mini, or Mini-Yoshi's Mini-Egg in the sequel.
In The Super Mario Bros. Super Show!, there was no Small Mario. Regular Mario was Mario's weakest form. Mario could become "Super Mario" (actually Fire Mario) by using a Fire Flower, Starman or some other source of power. The concept of "Super Mario" was dropped for The Adventures of Super Mario Bros. 3 and Super Mario World, which followed the physics of their respective games more closely.
In versions of Super Mario Run prior to the Fall 2017 update, Peach, Toad, Toadette, and Yoshi were defeated in one hit and therefore did not have Small forms to shrink into when getting hit, unlike in Super Mario Bros. 2, Super Mario 3D World, and Captain Toad: Treasure Tracker, thus making their usual regular form their only form in the game, and also their weakest form, despite having the advantage of being able to break Brick Blocks, unlike Mario and Luigi, who require their Super forms to do so. In versions since the Fall 2017 update, they are now given Small forms to shrink into when getting hit, therefore letting them take one more hit before being defeated, just like in Super Mario Bros. 2, Super Mario 3D World, and Captain Toad: Treasure Tracker. As in Super Mario Bros. 2 (only in the All-Stars version and the GBA remake) and Super Mario 3D World, Peach's hair gets shorter when she shrinks into her Small form. As a result, the characters lose their advantage over Mario and Luigi and require their usual regular forms to break brick blocks as in Super Mario 3D World and Captain Toad: Treasure Tracker, although they still start the level in their regular usual forms as they did in prior versions, unlike Mario and Luigi. Unlike Super Mario Bros. 2, Super Mario 3D World, and Captain Toad: Treasure Tracker, the characters return in their Small form after being defeated or falling in a hole or in lava (or if they are in their usual regular forms upon touching lava, they shrink in the bubble to their Small forms), similar to Super Mario Advance, even though they start the level in their usual regular forms, like how they did in the pre-Fall 2017 versions. However, in the Remix 10 mode, their form is determined based on whether Mario completed the fourth course while Small or Super, similar to Super Mario Advance. For example, if Mario is Small when he completes the fourth course and switches to Peach, she will start off in her Small form, as opposed to her usual regular form, like how she usually does in World Tour, Toad Rally, and in the Special Courses.
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