That's right, we now have a prototype of Mario Artist Paint Studio, dated 1999-02-11, which is about 9 months before the final build of the game.
It has quite a bunch of differences, with the inclusion of the cut flyswatting Gnat Attack minigame, but we have a video from Hard4Games giving you an overview here:
https://www.youtube.com/watch?v=DVYbGPJ5AN4
This prototype is however pretty buggy, and needed a little bit of time for fixes, which Zoinkity (mostly him) and I handled.
You can download this prototype in the Development Games page. It will have the original dump, alongside a playable fixed version.
Because of this prototype, I needed to update 64DD emulation to fix problems, therefore a new version of Project64, required to play the prototype, is now available in the Downloads page. For the first time in a while, this is a custom build with changes that aren't merged officially.
I am also happy to tell you that a new version of the 64DD Disk Dumper is now available, version 0.80 will now recognize disks that don't have a proper system area setup, and will now dump the disk using available information from the disk.
Have fun swatting some flies!
- F-zero X Expansion Kit Rom Patch Download
- F-zero X Expansion Kit Rom Patch Download
- F-zero X Expansion Kit Rom Patch Notes
- F-zero X Expansion Kit Rom Patch 2019
- F-zero X Expansion Kit Rom Patcher
If you'd like to support our preservation efforts (and this wasn't cheap), please consider donating or supporting us on Patreon. Thank you!

F-Zero X: F-Zero X: F-Zero X: F-Zero X Expansion Kit: F-Zero X Weilai Saiche (iQue) F-Zero X Weilai Saiche (v2) (iQue) (Manual) F-Zero X Weilai Saiche (v4) (iQue) (Manual) F1 Pole Position 64: F1 Pole Position 64: F1 Racing Championship: F1 Racing Championship: FIFA Road to World Cup 98: FIFA Road to World Cup 98: FIFA Road to World Cup. Jun 22, 2016 64DD Translated Roms.zip Dezaemon 3D Patched.z64 F-Zero X Expansion Kit (English).n64 SimCity 64 (part English patch 25 Feb 2016).n64 Simcity 64 (part English patch 31 July 2015).z64 having trouble with sim city 64, feb patch, everdrive 2 latest firmware, black screen on boot.
F-Zero X Expansion Kit |
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Developer: Nintendo This game has hidden development-related text. |
This page is rather stubbly and could use some expansion. Are you a bad enough dude to rescue this article? |
The F-Zero X Expansion Kit was released for the ill-fated Nintendo 64DD as a sort-of expansion pack to F-Zero X. Its biggest selling point is a track editor that allows creating new tracks from scratch and saving them to the 64DD disk, 15 years before Super Mario Maker was a thing.
Error Messages
Encoding SHIFT-JIS Windows Japanese CP-932
Hidden Images

Some large images of each one of the pilots in the format used by Mario Artist are stored in the F-Zero X Expansion Kit as 216×202 c16 images with a 16×16 thumbnail for use in the menu. They are unused by F-Zero X, but can be viewed by inserting this disc while Mario Artist is running.
F-zero X Expansion Kit Rom Patch Download
Program Text

Present at 0xAA802C (and modified to make general sense):
GOST is the filetype name for saved ghost data on disk, and CRSD is the filetype name for courses created with the built-in editor.
F-zero X Expansion Kit Rom Patch Download


These messages would have been output while debugging each step of loading a course in Time Attack mode with additional ghost data. In the final version these strings are not linked to code in any way.
File Protection
The file menu in the track editor originally had a protect feature, toggling read-only on a saved course. An unused function at 800F2E4C draws the menu, prints the prompt, and also applies or removes read-only on the file. When applied, other menus will not allow you to rename or delete the file.
F-zero X Expansion Kit Rom Patch Notes
There is no placeholder in the structs that build the file menu for an additional entry but there is a gap in the values returned when selecting each option.
The unused track editor assets in the cartridge games do include a menu image for the protect feature. There is also a text label for the entry in the disk version, as well as prompts and warnings displayed when a file is protected.
Address | Value | Translation |
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80032DAC | プロテクトがかかっています | Protected |
80033704 | プロテクトをかけています。 | Being protected. |
80033720 | プロテクトを解除しています。 | Protection removed. |
80033740 | プロテクトがかかっています。 | Protected. |
F-zero X Expansion Kit Rom Patch 2019
SNES | F-Zero (Prototype) • BS F-Zero Grand Prix 2 |
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Nintendo 64 | F-Zero X (Expansion Kit, iQue Prototype) |
Game Boy Advance | F-Zero Maximum Velocity (iQue Prototypes) • F-Zero GP Legend • F-Zero Climax |
GameCube | F-Zero GX |
Arcade | F-Zero AX |