This application is just a Japanese Mahjong scoring table. You can switch the display of the scoring tables below by pushing the buttons. ・ Oya Ron (Dealer - from a discard) ・ Oya Tsumo (Dealer - from the wall) ・ Ko Ron (Non-dealer - from a discard) ・ Ko Tsumo (Non-dealer - from the wall) Also, to understand how to calculate the score, you can turn off the "round-up mode", which does not dare round up to the tens place.