This week I've made a major breakthrough with #OpenCrystalCaves - decoded the #CrystalCaves sound files, so now the game has sound!
This was a goal from day one but the reverse engineering proved tricky. It didn't help that the wiki page was misleading (the data file actually has footers, not headers). Staring at the files in a hex editor eventually gave it away.
Pic unrelated - audio recording broken, something else we added recently.