When the Japanese version's passwords are put together in a string, they make up the first 114 digits of pi.
(3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214808651328)
The PAL and NTSC versions of the game use vowels instead of numbers, and are made of random strings.
(3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214808651328)
The PAL and NTSC versions of the game use vowels instead of numbers, and are made of random strings.

During beta testing for Ocarina of Time, developers added an Arwing from the Star Fox series to the game to test enemy AI and Z-Targeting. While it was never actually used in the game, the code was never removed and can still be accessed via devices like GameShark and Action Replay.
There's a hidden credit line in the game's ROM which reads:
(C) 1992 Basement Boys Software
Basement Boys Software were a group famous for making hacking tools on the Commodore 64 in the late 80s, who had some members go on to Chip Level Designs, a company that used to provide sound programming for a number of SNES titles. The same credit appears in Cool Spot.
(C) 1992 Basement Boys Software
Basement Boys Software were a group famous for making hacking tools on the Commodore 64 in the late 80s, who had some members go on to Chip Level Designs, a company that used to provide sound programming for a number of SNES titles. The same credit appears in Cool Spot.
There's a hidden credit line in the SNES version's ROM which reads:
(C) 1992 Basement Boys Software
Basement Boys Software were a group famous for making hacking tools on the Commodore 64 in the late 80s, who had some members go on to Chip Level Designs, a company that used to provide sound programming for a number of SNES titles. The same credit appears in Bubsy.
(C) 1992 Basement Boys Software
Basement Boys Software were a group famous for making hacking tools on the Commodore 64 in the late 80s, who had some members go on to Chip Level Designs, a company that used to provide sound programming for a number of SNES titles. The same credit appears in Bubsy.
There are 5 hidden "Sega!" voices in the Japanese version of the game, featuring an alternative Antowas voice, Astal, Geist, Gerardo and Leda.
There is a Debug Mode code accessed from the Sound Test in the options menu that is inputted by playing songs in the order 01, 09, 09, 02, 01, 01, 02, 04. This is a reference to the North American release date of the game, which was on 1992/11/24, or November 24th, 1992.
The code to access the Level Select is 19, 65, 09, 17. These numbers reference Sonic developer Yuji Naka's birthday, September 17th, 1965.
The code to access the Level Select is 19, 65, 09, 17. These numbers reference Sonic developer Yuji Naka's birthday, September 17th, 1965.
Generation III introduced a new attack specific to the Pikachu evolution line called Volt Tackle. In the Japanese version of the game, Volt Tackle is known as Volteccer.
Volteccer is the name of an attack used by Pulseman, the protagonist of a self-titled Sega Mega Drive game developed by Game Freak in 1994.
Volteccer is the name of an attack used by Pulseman, the protagonist of a self-titled Sega Mega Drive game developed by Game Freak in 1994.
The GameCube's BIOS menu has slow, seemingly random ambient background music.
This background music, when sped up to sixteen times its normal speed, is actually the intro jingle for the Famicom Disk System, a Famicom add-on released by Nintendo in 1986.
This background music, when sped up to sixteen times its normal speed, is actually the intro jingle for the Famicom Disk System, a Famicom add-on released by Nintendo in 1986.
Playing the song Ballad of the Goddess backwards results in the melody of Zelda's Lullaby being heard. Alternatively, reversing Zelda's Lullaby will yield a simplified version of Ballad of the Goddess.
In Vegetable Valley's second level, there is an Easter egg room that can be accessed by moving away from the Warp Star until it disappears. The blocks are stacked to form 'HAL', referencing the game developer's name.

Astal makes a number of cameo appearances throughout Archie Comics' Sonic the Hedgehog comic book series.
In issue #50 he is seen in a fight between the Overlanders versus the Mobians, alongside his bird.
On the cover of issue #51 he is seen in the crowd looking up at the main cast.
On the cover of issue #125 he is seen holding the "5" card.
In issue #50 he is seen in a fight between the Overlanders versus the Mobians, alongside his bird.
On the cover of issue #51 he is seen in the crowd looking up at the main cast.
On the cover of issue #125 he is seen holding the "5" card.

In the Ghost Square section of the Gold Saucer there is a pumpkin with green eyes in the corner of the room to the left of reception at the inn. Interacting with this pumpkin will cause it to laugh. This laugh is in fact a slightly slower version of the iconic laugh of Kefka Palazzo, the villain from Final Fantasy VI.
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