Kirby Tilt 'n' Tumble
Kirby Tilt 'n' Tumble
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The game cartridge for Kirby Tilt 'n' Tumble is unique among Game Boy Color cartridges, as it has a notch in its top right corner which usually only appears on original Game Boy games. This notch enabled original Game Boy cartridges to fit inside the system's cartridge slot. Other GBC exclusive titles lack this notch and will therefore not fit inside of an original Game Boy. A Game Boy will also not turn on when GBC games are forced into the slot.

Kirby Tilt 'n' Tumble, however, displays the following message when played in a Game Boy:

KIRBY Tilt 'n' Tumble

THIS GAME PAK WILL
WORK ONLY WITH THE
GAME BOY COLOR
VIDEO GAME SYSTEM.


It's possible that the game cartridges for Kirby Tilt 'n' Tumble were re-purposed from another, non-GBC exclusive game. Kirby Tilt 'n' Tumble is only Game Boy Color exclusive game with this feature.
Contributed by Takahashi2212
An issue of Nintendo Power magazine revealed that the names of the first two levels are "Big Sky Country" and "Tilt 'n' Tunnel", even though none of the levels are ever named during gameplay.
Contributed by Ophl
All of the minigames had their names changed in the English release. They include:
•Kirby's Balloon was changed to Kirby's Burst-A-Balloon
•Dance The Kirby was changed to Do the Kirby
•Kirby's FuriFuri Chicken Race was changed to Kirby's Chicken Race
•Kirby's Multi Ball was changed to Kirby's Roll-O-Rama. Also, the Kirby on the bottom right was moved slightly and the Blue Kirby's shadow was extended a little
Contributed by Ophl
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Two unused Kirby sprites can be found in the game's data which were meant to be uncovered in the position test in the options.
Contributed by Ophl
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The title screen was redesigned during the translation of the Japanese version for the game's U.S. release.
Contributed by Ophl
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In the original Japanese release, the Hamburger food featured in the American version was an onigiri (a riceball).
Contributed by Ophl
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A sequel was being developed for the Gamecube and was even shown at Spaceworld 2001. The game was supposed to demonstrate how the Game Boy Advance could be used with the GameCube as a controller. The game used a special cartridge in the Game Boy Advance to detect tilting. Kirby was removed as the mascot, and the game was reworked as 'Roll O Rama'. It's unknown why the project was cancelled.
Contributed by Boyobmas