License

1. Icons made by Feathericons are licensed by MIT License.
2. Icons made by Eucalyp are licensed by Creative Commons BY 3.0.
3. Riichi-mahjong-tiles made by FluffyStuff are licensed under the CC0 1.0 Universal License.
4. Background music Highland_Mist made by Wildfire Games is licensed under the Creative Commons Attribution-Share Alike 3.0.
5. Sound materials Dizi, Suona are licensed by Creative Commons 0 Licence.