Using the Debugger
Summary
The debugger comes in two forms. Form a uses CinemaMessage, which is reliable but ugly, and form b uses AreaTextClipF, which doesn't always work but is much neater.
They both load code from a file named payload.swf, which has to be located in the same directory as the SM63 executable.
The supplied payload.swf autoruns code in frame 1 -> DoAction.
Usable commands can be found in the SM63 functions/variables documentation spreadsheet.
You can run the code ingame by pressing the minus (-) key.
Usage
Download payload.swf and place it in the same directory as your SM63 executable. Create a new level designer level, place a sign and enter either <img src="https://raw.githubusercontent.com/Runouw-Mods/SM63-Mods/master/debugger/a.swf"> if you want to use form a or <img src="https://raw.githubusercontent.com/Runouw-Mods/SM63-Mods/master/debugger/b.swf"> if you want to use form b.
Premade level codes are available here if you want them.
Test the level and open the sign. Click the Activate button to begin debugging or Deactivate to end.
Once activated, press minus (-) to run payload.swf.