Each letter is a json that defines the bezier curves according to a schema.
They were created by starting by drawing the letters freehand, yielding essentially a dot to dot, and then (2) using an approximation/smoothing algorithm to convert that into beziers. Finally,I went through touching up/fixing each letter by hand, using a purpose built editor.
So I would say overall it's more time consuming than challenging.
That stills leaves the problem of joining letters together. For that I heavily lent on AI to propose an algorithm, although it required a lot of back and forth to get something even semi decent. At the moment it's probably 'good enough' but there's still lots of room for improvement.
On the countries quiz, you should be able to move and zoom on the bloge using click and drag (or pinch and drag on mobile). Letter constellations uses shaders. Both of those are only tested on Chrome, so that might be the issue.
Example letter: https://github.com/RobinL/letterpaths/blob/main/packages/let...
JSONSchema
https://github.com/RobinL/letterpaths/blob/main/packages/let...
Editor