https://www.puzzazz.com/ipuz http://fileformats.archiveteam.org/wiki/IPUZ https://github.com/dylanbeattie/ipuzzler/blob/main/gh-pages/js/ipuzzler.js https://github.com/dylanbeattie/ipuzzler/tree/main https://dylanbeattie.github.io/ipuzzler/ https://github.com/njyoon/njyoon.github.io/blob/main/js/puz.js https://libipuz.org/ipuz-spec.html#:~:text=The%20ipuz%20format%20is%20designed,for%20both%20creation%20and%20usage. https://code.google.com/archive/p/puz/wikis/FileFormat.wiki https://gist.github.com/sliminality/dab21fa834eae0a70193c7cd69c356d5 https://github.com/downforacross/puzjs/blob/master/src/puz.js
crosswords: https://communicrossings.com/crosswords-weyer#an-across-ages