License and attribution

Zung Jung Mahjong Scoring System (v3.3) by Alan Kwan, licensed under CC BY-NC-SA 3.0 HK. Reference section reproduced under that license. Tutorial, client code, and server are original work. Free and non-commercial. Not affiliated with or endorsed by Alan Kwan.

Questions and comments: Discord.

Third-party

• Tiles — FluffyStuff riichi-mahjong-tiles (CC0)
• Icons — Lucide (ISC); Feather-derived icons (MIT)
• Fonts — Roboto (Apache 2.0); Noto Sans SC (SIL OFL 1.1)

In the game, open the menu row About / License.