There are three unused levels still present within the game; an Airship Level, an unfinished version of Fahrenheit Frenzy, and a Warp Room that was presented at E3 2001. Out of the three, the Airship level is the most finished.
The E3 Warp Room is an area containing 5 warp pads, all of which have no collision and will not warp the player anywhere. Interestingly, each warp pad has a hologram of their respective levels overlaid on the pads. This feature isn’t used anywhere in the final game.
The Airship level and the E3 Warp Room can be accessed through Action Replay codes on the North American GameCube versions.
The E3 Warp Room is an area containing 5 warp pads, all of which have no collision and will not warp the player anywhere. Interestingly, each warp pad has a hologram of their respective levels overlaid on the pads. This feature isn’t used anywhere in the final game.
The Airship level and the E3 Warp Room can be accessed through Action Replay codes on the North American GameCube versions.

Originally, the Special Stages were going to have Sonic navigate a rotating maze, building upon the framework of Sonic 1's Special Stage. Although similar, Sonic CD's Special Stage was planned to have two rotating layers that the player switched between.
According to BEEP and Marukatsu MegaDrive magazine interviews, with game's planner Hiroaki Chino, the developers thought the Special Stage was very slow, so they decided to redo it to make better use of the Sega CD hardware.
According to BEEP and Marukatsu MegaDrive magazine interviews, with game's planner Hiroaki Chino, the developers thought the Special Stage was very slow, so they decided to redo it to make better use of the Sega CD hardware.

Icons exist for the Imperial Watch Armor, although there is no way to obtain it in-game (apart from the shield).

Icons exist for the Mythic Dawn Armor, but it cannot be worn as the items are classified as "bound items" and not equippable gear.

There exists an icon for the Dark Brotherhood rank of "Executioner", but the game forgoes it, promoting the player from "Assassin" to "Silencer".
Although the player can only see portions of Hogwarts during the wintertime in the original PlayStation version, several other areas are actually modeled out in the season's theme. Attempting to enter the Quidditch field during the winter will change the season to summertime.

A bizarre image of a turkey leg inside the EA Sports ring can be found in the original Playstation version's data. This also appears in the Madden 2002 to 2005 games.

Dozens of unused courses can be found in the game's data, including one modeled after the SEGA logo.
A demo build of the game shows that Frogger would've had a lot more animations, including Frogger bouncing, doing a mid-air flip, and extra death animation, hopping to his left and right, doing a cartwheel, a "leapfrog" animation, panting, an alternate slipping animation with one slipping to the left and one to the right, a drowning animation, doing a super hop, two idle animations, kicking upwards while doing a handstand, and doing a "superstart."
The sinking and mid-air flip animations would later be used in the sequel.
The sinking and mid-air flip animations would later be used in the sequel.

The Game Boy Advance version contains palettes of the Konami Computer Entertainment Kobe logo found in the data, which was likely planned to be used for the intro when booting up.

By datamining a demo build of the game, an image of Donkey Kong Jr. can be found, suggesting that he may have been planned to appear in the game instead of Diddy Kong. Interestingly, Diddy Kong's internal filename in the final version is listed as "dk_jr," suggesting that Diddy's appearance may have been a later addition.

Within the game's data are unused graphics for a an ability that would see Kirby shrink down to a small size. Because of their placement in the game's data, it's speculated that this ability was replaced by the UFO power.

Much like in Dance Dance Revolution Solo Bass Mix a unused, more simplistic variant of the banner of "TOGETHER AND FOREVER" by NINEBALL feat. ATOMIC GUN & JULIA can be found in the game's data.
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