Original text by Spyrosbiggestfan5678 and YamiHoshi. Pictures by jimbo390 and Yoshidude4.
The only beta item viewable by normal gameplay in the demo version through the item roulette, the Chain Chomp item is presumed to have been similar to the Chain Chomp in Mario Kart: Double Dash!! for the GameCube. One can not actually obtain the Chain Chomp, which is why it is beta. YamiHoshi discovered that the model for the Chain Chomp item actually exists in a file called "Main.carc" with all of the other item models, but trying to make it work fails, because there is no animation for it and the music doesn't exist in the demo. In the final, it was replaced by the Bullet Bill. However what does exist is a bottom screen icon for it.
The Bowser's shell item does not appear in the item roulette, but what is interesting is that it has a sprite in the Menu.carc file with the rest of the items. It even has a sprite of the bottom screen icons, but once again does not appear in game. Most importantly, it has a model, discovered by Spyrosbiggestfan5678, called "it_togezo.nsbmd". The fact the file was called "togezo" (the Japanese name for Spinys) is slightly odd, as in Mario Kart: Double Dash!! the file name for Bowser's Shell is "koura_koopa" ("koura" meaning shell, "koopa" meaning Bowser).
Purple shells were discovered in the file where the sprites for the item roulette are found by Jimbo390. Interestingly, there is also an image of it in the bottom screen icons file ("sub_obj.NCGR"), viewable when the correct palette file is used to view it in CrystalTile 2. Spyrosbiggestfan5678 discovered that there is a model for it, called "it_koura_p.nsbmd" in Main.carc, the "p" standing for purple. It is unknown what this item would have done, however, the item roulette and map screen sprites only conatain a sprite for Triple Purple Shells.
Maybe in the final the Blooper is not beta, but in the demo, it doesn't actually appear. Because of this, it is classed as beta. The Blooper even has a sprite for both the top and bottom screen, but never appears. It "looks like the Gooper Blooper from Super Mario Sunshine" in the words of YamiHoshi, but it is the normal blooper from Super Mario Sunshine. Again, Spyrosbiggestfan5678 discovered the model, called "it_gesso.nsbmd"in Main.carc. The model looks very different from the item sprite.
The Boo item also exists in the Beta, but never shows up, but it does in the Item Roulette. Because of this, it's classed as Beta. Once again, Spyrosbiggestfan5678 discovered the model, called "it_teresa.nsbmd". However, it crashes when you get it through cheating.
- None of the above items are obtainable, but all of them have models.
- The existence of the Chain Chomp and the Bowser's Shell is evidence of Mario Kart DS being based on Mario Kart: Double Dash!!
- In the demo, the Chain Chomp model exists but the music doesn't, whereas in the final, the music exists but the model doesn't.