Overview

Chaos Mahjong Night is a chaotic twist on the Riichi Mahjong, where players introduce new rules and variations that keep everyone on their toes.

Basic Play

The core of the game revolves around the standard Riichi Mahjong rules, as implemented in the Mahjong Soul client. However, there are no dealer repeats, and before each hand the dealer introduces a new rule. That rule takes effect as you wash the tiles and remains in effect for four hands; when you deal again, the rule will be removed and you can choose a new rule to implement (or reimplement the one that just expired).

The Rules of Chaos

• New rules cannot introduce dealer repeats.
• New rules cannot introduce unfair advantages.
• New rules cannot interfere with these rules of chaos.
• When a new rule is proposed, if three players veto it, the proposed rule is not implemented. Instead, that player may propose another rule.
• Use Vetos sparingly—they are a check against abuses of the system, not really a free pass to judge other's ideas of fun.
• If the rule introduced by the player opposite the dealer (two turns ago) isn't working out, the players may vote to remove or amend the rule. The rule is removed or amended if three players vote for that removal or amendment.
• If one player's new rule interferes with anothers, players should make a good faith attempt to incorporate as much of the old rule with the new one, subject to the new rule being interpreted as intended.

You can do just about any other change your mad heart desires. Here are some ideas:

• You can add a few local yaku.
• You can remove a few yaku.
• You can restructure the scoring system.
• You can reset the core rule set to some other common ruleset.
• You can introduce or remove tiles.
• You can change the hand size (please provide a yaku list if necessary).
• You can mess with the turn order (but not the order of dealers).
• You can hit the randomizer button on this website.
• You can introduce more hidden information or betting.
• You can introduce tiles shared between all hands.

Some advice as you pick your new rules:

• Keep it easy to bundle together; it can be easier to remember 7 related rules than 3 unrelated rules
• Keep it somewhat small, so that the combined result of 4 people's additions is not overwhelming
• Don't make it too small; we want to make sure your set of rules has an impact in 4 turns. If you only add one hard-to-get yaku, that is the same as doing nothing!
• Keep it themed; when introducing several rules, if they tie together in a theme that can be more fun!