This is the track editor for Mot's Grand Prix
I don't recommend running this in browser as you cannot saveload tracks - anything you build will be lost.
Rather download the file and run it in Pico-8 itself.
You will also need to download the main game and run it in Pico-8 in order to race on any tracks you create.
This editor requires a keyboard and mouse.
Existing tracks
You can download the tracks from the existing game from this Google Drive folder. Place them in your carts folder (next to the editor) then select 'Load' from the editor hamburger menu (top right) to load them.
Basic usage
IMPORTANT: There are known bugs that will crash the editor, so save often!

Use the arrow keys to scroll along the track.
Use the hamburger menu (top right) to load save and export tracks.
The 'New' menu creates new stages, curves and items (described in detail further down).
Click 'Drive' to drive on the track (select 'Editor' from the pause menu to return to the editor).
Select things by clicking on them. You can then edit their properties, or delete them by clicking '-'.
After making a change you usually have to click 'Update' (bottom right) to update the visual model (I didn't have enough tokens to make this automatic).

Track format
The basic components of a race track are:

Stages
Curves
Items

Stages
Are used to partition the race track. Every track must have at least one stage.
The advantage of having multiple stages is that their curves and items are stored independently of the other stages, so if you modify the curves in a stage you only need to fixup the positions of the background items within that stage. Also they can help you keep track of what part of the track you are working on.
Click 'New->Stage' to add a new stage. The new stage will be inserted immediately after the current stage.
The current stage is disp