Augment MahjongAugment Mahjong

[Rules aren't meant to be followed; they're meant to be rewritten.]

A cyberspace within a space observatory where endless starlight flows. Victory here isn't decided simply by luck and point calculations. Whoever modifies the rules of the board first determines the outcome. Share authority with one of two opposing management assistant AIs, If and Else, and twist the rules of Mahjong with the Augment cards given each round to seize first place!

[Key Features]

■ Augments — Weapons That Rewrite the Rules

At the start of every hand, pick a rule-modifying card that applies to you alone. Beyond the shared pool, exclusive cards unlock through your Guide and in team play — there isn't a single filler card in the deck.

■ System Overrides — Global Disasters that Strike Everyone

If Augments are your personal weapons, System Overrides are common variables that tighten the noose around all four players.

■ Guide Selection: The Chaos of IF vs. The Order of ELSE

The exclusive Augment cards you can draw will change depending on who you team up with in the lobby.

■ Custom Interface from Beginners to Veterans

Easy Explanation Mode: Turn this on if complex Mahjong terminology is unfamiliar. All Augments and System Rules are instantly translated into intuitive, beginner-friendly sentences.

4 AI Difficulties: Supports various AI levels, from aggressive bots aiming to minimize Shanten (tiles away from winning) to balanced bots that comprehensively calculate expected values, defense, and Augment variables.

■ Custom Room: Take Control of the Match Environment

Adjust the appearance rates of Augment cards by tier (Normal / Rare / Legendary).

Toggle System Overrides On/Off and adjust thinking time (Base + Banked time).

Set Tobi (Bankruptcy) match-end conditions and the number of Aka Dora (Red Fives).

Individually assign AI difficulty and personality (If / Else) for each empty seat. The entire aspect of the game changes completely based on the host's settings.

■ Campaign Mode: A Roguelite Run Through a Collapsing Mainframe

Tag up with IF or ELSE and push through sectors that deepen toward the Core before the collapse clock runs out. The clock never stops — not while you travel, not while you play.

Teammates can see each other's hands: feed your partner the tiles they need and guard their winning waits. That cooperation decides 2v2 matches. Scores don't reset between hands.

Your team's points carry over from match to match — one bad hand becomes the starting line of the next. The route is yours to choose.

Keep playing, gear up at the shop, or gamble on a dangerous anomaly — every step is a trade against time. You can only carry so many Augments. What you give up, more than what you gain, shapes the late run.

[⚠️ Warning (Please Read)]

This game does NOT feature a tutorial to teach the basic rules of Mahjong.

It is an "advanced variant" game that assumes you already know the basic rules of Riichi Mahjong. If you do not know how to play Mahjong at all, normal gameplay will be impossible, so we do not recommend purchasing this. We strongly encourage you to discover the joy of Mahjong first through excellent games like Mahjong Soul or Riichi City before coming here.