Practice.
Two drills. One deals you a winning hand and asks what it's worth; the other deals you thirteen tiles and asks what you're waiting on. Both are graded by the same engine behind the Studio, so the answer key is the one the rest of the site uses.
Read the wait
Thirteen tiles, one short. Tap every tile that completes it. The reveal shows what each wait pays — the half most people never work out at the table.
Score the hand
A complete hand with seat, round, flowers and how it was won. Count the fan — or switch on pattern naming for the tournament version, where the number alone won't do.
Progress is kept in this browser only — no account, nothing sent anywhere. Rules are HK standard throughout: 13 fan limit, flowers on. See the scoring reference for the tables these hands are graded against.