A printable hand-out for players learning the game for the first time.
A tutorial video on basic Hong Kong mahjong. This ruleset is the one we most commonly use and is the basis for most other versions of the game.
A printable sheet containing the standard hand patterns and conversion table for Hong Kong Old Style scoring.
A house-rules scoresheet developed by one of our members as a compromise between HKOS and Riichi scoring. This is the scoring system we mainly use at our meetups.
Alternate House Rules Scoresheet
Standard HKOS scoring rules plus a few extra house-rule patterns (listed separately).
It might look overwhelming, but most patterns in Hong Kong mahjong are unlikely combinations that you'll almost never see. The few hands listed in the "important patterns" section are all you really need to know to get started.
A video on the basics of playing Japanese mahjong on Mahjong Soul.
Online wiki for Japanese mahjong.
Riichi Book 1 - a strategy guide for Japanese mahjong
A more advanced guide for people who know how to play Japanese mahjong but want to get better.
Let's Mahjong in 70's HK Style
An app available on Android/iOS
Online client for competitive ranked play for Japanese mahjong.
Game is in Japanese, but an English translation plugin is available here.
This game is a lot more popular than Tenhou, but is also VERY anime.