Tools
MJ Studio.
Build a hand and score it. Drag tiles onto the felt, and the studio reads it live — what it's called, the itemized fan, what it's waiting on, and how different tables would pay it. Export a picture or share the hand as a link.
beta desktop-first
Table · exposed
Hand · concealed
Wall · 牌牆
Seats · round
東round
Won by
Bonus conditions
Kong replacement 槓上開花 Flower replacement 花上自摸 Robbed a kong 搶槓 Last tile 海底撈月
Score Rules · HK standard
Drag tiles anywhere: into the hand, into the exposed row, between rows, off the felt to remove. Exposed tiles auto-group — 3 alike = pung, 4 alike = kong, a run = chow; use a gap ⇹ to keep groups apart. Click a tile for ✕ / 👑 (winning tile) / ⇅ (flip a kong concealed). Overfilling is allowed for illustrations — scoring pauses until 14.