subdirectory_arrow_right Yoshi's Island: Super Mario Advance 3 (Game)
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During the second phase of the final boss fight in the SNES release, Baby Bowser has three fingers on each hand, contrasting with most official portrayals of Bowser, which show him with four. This error is fixed in the Game Boy Advance version, which redraws his sprites to give him the proper number of fingers.
person VinchVolt calendar_month March 21, 2024
YouTube video showcasing the final boss fight in the SNES version:
https://www.youtube.com/watch?v=anv1LZzX-Qw

YouTube video showcasing the final boss fight in the GBA version:
https://www.youtube.com/watch?v=btZF6Ym8h80
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Attachment Early designs of the Toadies in the ys_romX_0 prototype of the game show that they originally resembled Snifits.
person CuriousUserX90 calendar_month December 2, 2023
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Attachment Leaked development files for Yoshi's Island show graphics of a razor blade hazard or weapon, possibly intended to be thrown by an enemy. This was likely removed from the game over concerns of violence and/or imitability.
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While Bumpties can only bump into Yoshi and not hurt him, if Yoshi is hurt by a different enemy or obstacle and a Bumpty is on-screen, it will run to and steal Baby Mario similarly to a Bandit. This is the only game in the Yoshi series where Bumpties are known to behave like this, and is a rare interaction since there are few instances in the game where Bumpties and obstacles are close enough to trigger it.
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Attachment Among files uncovered in the Gigaleak, a large-scale leak of assets from Nintendo's internal servers in 2020, are various assets from Super Mario World 2: Yoshi's Island depicting alternate ideas for Baby Mario. The earliest of these assets are a series of sprites from October 1993 depicting him in a bonnet and with a mustache similar to his adult counterpart; by comparison, the earliest sprites depicting his final design are dated to August 1994.

In the interim, however, Nintendo apparently considered omitting Baby Mario entirely; sprites dating to the spring of 1994 show that the developers considered having the Yoshi Clan ferry an infant wizard around instead. These sprites depict the wizard both in normal gameplay and in the pre-rendered CGI graphics used in the opening cutscene. Other sprites of the wizard show that they would've provided an in-universe reason for Yoshi's ability to transform into various vehicles: the wizard would cast a spell on a Yoshi egg while encasing themself and the real Yoshi in a bubble.

While the developers ultimately went back to using Baby Mario, the wizard still appears in a prototype build from December 6, 1994. In this iteration, the wizard is a form that Baby Mario can turn into through the use of an item depicting the projectiles fired by Kamek in the penultimate area of "6-8: King Bowser's Castle". This "Wizard Mario" form could similarly cast spells that transform certain enemies into objects such as eggs, watermelons, and Winged Clouds.
person VinchVolt calendar_month October 27, 2023
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Attachment In a 1995 developer interview, Shigeru Miyamoto stated that the Super Star was originally going to briefly transform Baby Mario into his adult self. However, the idea was discarded after one of the developers pointed out that it would clash with the game's premise of being an origin story for the Mario brothers. Instead, Super Star Mario was redesigned to simply be Baby Mario in a yellow cape.

In 2020, sprites for Mario's adult form were uncovered as part of a massive leak of data from Nintendo's internal servers. These sprites indicate that Super Star Mario was not originally able to float in the air and that he was able to ride Yoshi to some extent (in the final game, Yoshi reverts to an egg until the Super Star wears off).
person VinchVolt calendar_month October 27, 2023
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Attachment The game was originally intended to be the fifth installment of the Super Mario Bros. series, with two leaked prototypes from December 1994 featuring a title screen with the logo Super Mario Bros. 5: Yoshi's Island. Come the final release, and the prefix would be shortened to Super Mario. This explains why the international release was titled Super Mario World 2: Yoshi's Island, as the original Super Mario World was subtitled Super Mario Bros. 4 in Japan.

Additionally, the later of the two prototypes features a radically different design for the logo, using a much sleeker and blockier font. The final release would revert to the earlier logo, barring the aforementioned truncated prefix.
person VinchVolt calendar_month October 26, 2023
December 6, 1994 prototype information:
https://tcrf.net/Proto:Super_Mario_World_2:_Yoshi%27s_Island/ys_romX_0

December 19, 1994 prototype information:
https://tcrf.net/Proto:Super_Mario_World_2:_Yoshi%27s_Island/ys_rom_0_D

Comparison between the final title screens in the Japanese and international releases:
https://tcrf.net/Super_Mario_World_2:_Yoshi%27s_Island/Version_Differences
subdirectory_arrow_right Plok (Game)
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According to Plok co-creator Ste Pickford, Mario creator Shigeru Miyamoto considered an early build of Plok to be the third best platforming game behind his own Mario in first, and the rivaling Sonic the Hedgehog in second. He reportedly expressed interest in helping Software Creations make Plok of a higher quality than Sonic, even if not Mario. Ultimately, he passed up the opportunity, with Pickford believing it was due to similarities with the then-unannounced Super Mario World 2: Yoshi's Island.
person Rocko & Heffer calendar_month September 25, 2023
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In a 1995 interview with Shigeru Miyamoto published in the September issue of Haou magazine, he was asked about how long it took to develop the game? He responded:

"The staff members who have been working on it the longest started around the time Super Mario World was released, so about 5 years. The first two years were mainly spent experimenting with different ideas. We had one idea where Yoshi would move around freely, and he’d support Baby Mario and lead him through the stage. Almost all of those early ideas came to naught, but the one that really stuck and bore fruit for us was the idea of a game where even though you hit enemies, you don’t die."
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It's possible that Tweeters were originally going to appear in the game. Tweeter graphics from Super Mario All-Stars appear in the game's code, and could have been place holder graphics for the enemy.
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The enemy "Harry Hedgehog", a fast moving blue hedgehog, is thought to be a subtle reference to Sonic the Hedgehog.
subdirectory_arrow_right Yoshi's Island: Super Mario Advance 3 (Game)
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In stage "Extra 3: More Monkey Madness", a 21st Red Coin can be found. The coin is hidden under a peg occupied by a gray Tap-Tap, with a rotating Paddle-Wheel above it, making it difficult to access. In the Game Boy Advance port, this coin is removed, indicating that it may have been present in the SNES version due to either a glitch or mistake.
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Attachment The German version of the level "Touch Fuzzy, Get Dizzy" is titled "Lustiges Sporen Drama". This abbreviates to "LSD", referencing the psychedelic, disorienting effects of touching the Fuzzies that serve as the level's English namesake.
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Attachment In "World 6 - Extra" in the Japanese release, Yoshi's name is spelled out as "Yossy" during the segment in which the player must jump on a number of moving platforms. This was changed in the International version to spell out "Yoshi".
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Attachment In the game's ROM, empty levels slots are filled with copies of World 1-1. These slots can be accessed through the use of hacking tools. When one of these levels is accessed in the Japanese version, a special title card will be shown which translates to "Yoshi's Island - Hollow Grassland".
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Attachment Inside the game's data is an unused and alternate sprite for Yoshi spitting watermelon seeds. The sprite is not as puffed up as the sprite in the final version.
subdirectory_arrow_right Yoshi's Island: Super Mario Advance 3 (Game)
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In the Game Boy Advance version of the game, dying enough times during the intro level to get a game over will result in the game's save file displaying "World 0." This is the only time this icon is accessible in the game, and in any version of the game, as the Super Nintendo original gave you infinite lives to beat the tutorial level.
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Attachment If the game detects anything other than a control pad plugged into either port, an error message will pop up until the offending controller is removed. The color of the text changes every frame, gradually cycling through the entire 32,768-color palette.
sell
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Attachment The enemy "Burt the Bashful" looks like Obelix from "Asterix". This was referenced in other language versions of the game. The boss's name in the French version of the game is 'Belixo', an anagram of Obelix. In the German version of the game the boss's name is Xilebo, Obelix spelled backwards.
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