6 November 2022 Update

Ten new puzzles have been added.

The dropdown menu to select a song/puzzle has been replaced with three menus displaying the available puzzles sorted by difficult, name, and if you have previously solved them.

The "length" puzzle type has been changed; this now adds or removes a swing-ish tempo to the selected measure.  Previously this switched note duration between the longer and shorter notes in the measure.  I think this does a better job at producing measures that don't immediately song off which was especially problematic in the previous version when a long duration had to be divided over many short notes.

Fixed a minor issue on Firefox.  It appears that the audio system has a startup time which results in the first few samples played to be somewhat distorted.  The audio now includes a brief silence at the start to avoid this.