List of Mario Kart DS pre-release and unused content

These are beta elements from Mario Kart DS.

Many thanks to people at DSHack Forums for almost all information.

Unreleased Courses
Theses courses can only be accessed with an Action Replay DS or by ROM Hacking. If Action Replay is used, the courses can only be played untextured, but if the ROM is hacked to play the textures then the textures appear.

This was going to be GCN Mario Circuit from Mario Kart: Double Dash!!, which was almost complete but was likely replaced by either GCN Mushroom Bridge or GCN Yoshi Circuit. It is still in the game's data however, and can be accessed by Action Replay (No textures) or ROM Hacking (With textures).
 * old_mario_gc

This course has a similar route to Waluigi Pinball Beta (pinball_course) and different textures (Yellow with brown spots on the ground) and shares objects with said course, but is highly incomplete and it is unlikely that Nintendo ever wanted to complete it. It cannot be accessed by Action Replay because the beta flippers and bounds do not load. It can be accessed by ROM Hacking though.
 * luigi_course

It starts by going straight then up and round, then comes to a tunnel, then turns right then left over a metal floor. Then it comes to another tunnel which curves then comes back to the start line. Textures can be seen only by ROM Hacking. .
 * dokan_course

This is a very confusing course and it was most likely used for debugging. It has been discovered that it is only playable by fixing some files, and that the model shown in the course does not fit with the collision file. Instead it is almost a circle but with extra paths leading to nowhere. Objects such as the bridge from Delfino Square, the gears from Tick-Tock Clock, and the Round object seen in Bowser Castle appear here, along with a mysterious "test_brock", a checkered cube. This course can not be accessed by Action Replay, only ROM Hacking.
 * test1_course

In the final version, this course is the beta version of Waluigi Pinball (See below), but in the demo, this course has almost the same route as DK Pass (snow_course) and many mistake it for said course with texture hacks, but it is not the same. The grass is checkered, and the road is brown. If you touch the grass in the final version, you go through or the game crashes. It cannot be accessed with Action Replay because in the final it is Waluigi Pinball Beta which cannot be accessed without ROM Hacking, which is the only way to play this course.
 * donkey_course

See below.
 * wario_course

Possibly a new Koopa Troopa Beach course, as nokonoko is the Japanese term for Koopa Troopa. It does not seem to resemble its predecessor in any way, and could have been an entirely new Koopa Troopa course. Again, textures can be seen by ROM Hacking only.
 * nokonoko_course

This was a debugging stage not intended to be playable in the release version. However it can still be accessed with textures by ROM Hacking or without textures by Action Replay.
 * test_circle

This course was going to be the Block City battle arena from Mario Kart: Double Dash!! but was never completed with the blocks for unknowns reasons and was replaced by Pipe Plaza. It can be accessed with Action Replay without textures, or with textures with ROM Hacking.
 * mini_block_course

Items
Demo version guides released for stores by Nintendo depicted the Chain Chomp (which could not actually be retrieved in the demo version itself) as an item; it is presumed that this Chomp item would function similarly to that of the Chain Chomps in Mario Kart: Double Dash!!. The Chain Chomp can be seen in the item roulette in demo versions of the game. It is likely that the Chain Chomps were removed in favor of Bullet Bills. When the item images are extracted from the demo game, what appears to be a Bowser Shell from the aforementioned game also appears there along with the Chain Chomp, though it does not appear in the item roulette.
 * Chain Chomp
 * Bowser's Shell

Menu
The kiosk demo version contain some files of a very early menu; it was going to be a menu similar to the one of Mario Kart: Double Dash!! with the blue star background. Also, the extracted car images (not models) from a different file in the demo game appear to resemble those of said game too. In some screenshots of a very early MKDS, a speedometer resembling that of MKDD appears. All of this might be proof that MKDS was going to be based on MKDD.

Karts
Two unused karts have been found in the game data. A Egg 1 kart with pink dots instead of green dots, maybe a Birdo Egg. The other one is a completely different Wario kart, purple with a kind of mouth on the front of it. .

Courses
Different textures and the slot machine near the end of the level was part of the course for players to drive over. It is assumed the changes in this course are largely due to programming errors.
 * Waluigi Pinball

Exactly the same but missing fireballs and crowd cheering. The real Wario Stadium is called stadium_course.
 * Wario Stadium (wario_course)

Almost the same but it takes place in a sunset sky instead of space. Also, the top screen show the Nintendo DS logo instead of the Mario Kart DS title screen and the bottom screen show a green sky with some clouds. It can only be accessed with ROM hacking because this stage is in the demo version. .
 * Nintendo DS

Exactly the same but the sky is orange instead of being blue. It can only be accessed with ROM hacking. .
 * Pipe Plaza

Music

 * There is a file in the demo game called SEQ_CIRCUIT2.sseq, which is unused in the game. Also, there is a beta version of Figure-8 Circuit which is heard by default when playing the demo version on the aforementioned track.

Unreleased Courses Filenames

 * old_mario_gc = The unused GCN Mario Circuit.
 * luigi_course = It is like Waluigi Pinball, but has different textures and a slightly different route.
 * dokan_course = The unused bendy course with two pipes.
 * test1_course = The most confusing course ever. (See above)
 * donkey_course = Almost the same as DK Pass but with jungle textures rather thatn snow. NOT A TEXTURE HACK OF SAID COURSE!
 * wario_course = The unused version of Wario Stadium.
 * nokonoko_course = The unused beach course which many call Koopa Troopa Beach.
 * test_circle = Self-explanatory.
 * mini_block_course = The unused GCN Block City.