Hong Kong Mahjong and Japanese Riichi Mahjong share the same ancestor, but they’ve evolved into very different games. If you know one and want to learn the other — or you’re just curious about the differences — this guide covers everything you need to know.

Quick Overview

Aspect	Hong Kong Mahjong	Japanese Riichi Mahjong
Also called	Cantonese Mahjong	Riichi, Japanese Mahjong
Players	4	4
Tile count	144 (with flowers/seasons)	136 (no flowers/seasons)
Scoring unit	Faan (番)	Han (飜) + Fu (符)
Minimum to win	Usually 3 faan	1 yaku
Game length	Flexible	Typically 1 or 2 rounds
Complexity	Moderate	High

Tile Sets

Hong Kong Mahjong (144 tiles)

3 suits x 9 tiles x 4 copies = 108 suited tiles
4 winds x 4 copies = 16 wind tiles
3 dragons x 4 copies = 12 dragon tiles
4 flower tiles + 4 season tiles = 8 bonus tiles

Japanese Riichi (136 tiles)

Same 108 suited tiles
Same 16 wind tiles
Same 12 dragon tiles
No flower or season tiles
Some sets include red fives (赤ドラ) — special 5-tiles that serve as bonus indicators

The biggest difference: Hong Kong uses flower and season tiles for bonus faan, while Japanese Riichi doesn’t use them at all.

Scoring Systems

This is where the two variants diverge most dramatically.

Hong Kong: Faan (番)

Scoring is straightforward. Count up the faan from your hand’s patterns, look up the payment on the table, done. Faan roughly double the payout with each increase.

Common faan sources:

Self-drawn: 1 faan
Dragon pung: 1 faan
Mixed One Suit: 3 faan
Full Flush: 7 faan

Japanese Riichi: Han (飜) + Fu (符)

Japanese scoring is famously complex. You need both han (similar to faan) and fu (minipoints based on specific tile compositions). The final payment is calculated using a formula that considers both values.

Additionally, Japanese Riichi has:

Dora (ドラ) — Bonus tiles indicated by the dora indicator on the dead wall. Each dora tile in your hand adds 1 han.
Riichi declaration — You can declare riichi when you’re one tile away, betting 1,000 points for +1 han and access to special bonuses.
Ura-dora — Additional bonus tiles revealed only if you win after declaring riichi.

The result: Japanese scoring requires either memorization of lookup tables or a calculator. Most casual players use apps or reference sheets.

Key Rule Differences

Claiming Discards

Hong Kong: You can claim discards for chows, pungs, kongs, and wins. Chows can only be claimed from the previous player in turn order (the player whose discard you would normally draw after).

Japanese Riichi: Same basic structure, but with an important addition — furiten (振聴). If any of your potential winning tiles are in your own discard pile, you cannot win by discard. You can only win by self-draw. This rule fundamentally changes defensive strategy.

The Riichi Declaration

This is unique to Japanese Mahjong. When you’re one tile away from winning (tenpai), you can declare “Riichi,” place a 1,000-point stick on the table, and turn one discard sideways. Benefits:

+1 han to your hand
Access to ippatsu (winning within one round) for another +1 han
Access to ura-dora for potential bonus han

The trade-off: after declaring riichi, you cannot change your hand. You must discard every tile you draw unless it completes your hand.

Hong Kong Mahjong has no equivalent mechanic.

Defensive Play

Hong Kong: Defensive play is important but optional. You can discard freely, though experienced players avoid feeding obvious hands.

Japanese Riichi: Defense is critical. The furiten rule means you must track your own discards carefully. Experienced players also practice “betaori” (defensive folding) — intentionally abandoning their hand to avoid dealing into an opponent’s win.

Open vs. Closed Hands

Hong Kong: Opening your hand (claiming discards to form sets) reduces your hand’s concealment but doesn’t block most scoring patterns. Some hands score more when concealed, but most are still valid when open.

Japanese Riichi: Opening your hand is much more costly. Many yaku (scoring patterns) are only valid with a closed hand. Declaring riichi requires a closed hand. This creates a strong incentive to keep your hand closed, making the game more secretive and tense.

Draws and Exhaustive Draws

Hong Kong: When the wall runs out, it’s a draw. Typically no special penalties or bonuses.

Japanese Riichi: When the wall runs out (ryuukyoku), players who are tenpai (one tile away) receive a payment from players who aren’t. This creates endgame tension as players decide whether to push for tenpai or fold defensively.

Cultural Context

Hong Kong Mahjong

Deeply social — talking, eating, and joking during play is expected
Often played for money (even small amounts)
Common at family gatherings and Lunar New Year
Games are flexible in length — play as many rounds as you want
Scoring disputes are part of the culture

Japanese Riichi

More formal and quiet during play
Popularized through manga and anime (Akagi, Saki, etc.)
Large competitive tournament scene
Often played online (Mahjong Soul, Tenhou)
Standard game formats (East-only or East-South)

Which Should You Learn?

You should try Hong Kong if…	You should try Riichi if…
You play with Cantonese-speaking friends/family	You enjoy anime/manga mahjong culture
You prefer social, relaxed gameplay	You like strategic depth and complexity
You want simpler scoring	You enjoy competitive/tournament play
You play in person primarily	You also want to play online
You’re in Hong Kong, Southeast Asia, or diaspora communities	You’re interested in the global competitive scene

Many players enjoy both variants. Learning one makes it much easier to pick up the other since the core mechanics (sets, draws, discards) are the same.

FAQ

Can I use the same mahjong set for both variants?

Yes, mostly. A Hong Kong set with 144 tiles works for Riichi — just remove the 8 flower and season tiles. Some Riichi sets include red fives, which aren’t used in Hong Kong Mahjong, but they’re optional for Riichi too.

Which variant is more popular worldwide?

Hong Kong Mahjong is more popular in Chinese-speaking communities, while Riichi has a larger global competitive presence thanks to online platforms and anime culture. Both are widely played.

Is one variant harder than the other?

Japanese Riichi is generally considered more complex due to the fu/han scoring system, furiten rule, riichi declaration, and dora mechanics. Hong Kong Mahjong has a simpler scoring system but its own depth in hand-building strategy.

Can TileBuddy score Japanese Riichi hands?

TileBuddy is designed specifically for Hong Kong Mahjong. For Riichi scoring, dedicated Riichi scoring apps or online platforms handle the han/fu calculations.

Playing Hong Kong Mahjong? Download TileBuddy for free on the App Store for instant faan calculation and payment tracking built specifically for Cantonese-style play.

Hong Kong vs Japanese Riichi Mahjong: A Comparison