Colorfall · Same Game
Adapted from Same Game by Simon Tatham and contributors.
https://github.com/chrisboyle/sgtpuzzles/blob/d1e10eb57dd80af4999e698a9ab31f546e9a0b9d/app/src/main/jni/samegame.c
MIT source license (included); store graphics not used.
Original C guaranteed-soluble generator made the twelve boards. Browser port of group removal, scoring and collapse rules with an original responsive DOM interface. No original graphics or third-party assets.