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Anomaly Mahjong

Anomaly Mahjong

Can you escape from the strange Mahjong that goes on forever? Note: Knowledge of Japanese Mahjong is required to play this game. "Ihen Mahjong" is a Mahjong game where you spot "abnormalities" during play in special rounds dedicated to identifying these "abnormalities," and solve "Mahjong Puzzles"

Released Sep 26, 2024 Developer YUTAMARO WORLD Platforms Windows StrategyTurn-Based TacticsPvEBoard Game3D
View on Steam ↗ $4.99 (US · as of 2026-05-15)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-26.

65.3%positive95 reviews
Recommended · 1 found this helpful

“The only game where you sit at the table with three bored wizards who do anything from building pyramids to summoning a fifth tile and when you point out their magic you`ll just hear a "oh,sorry"”

— a player, Steam review · 3 hrs played
Recommended · 1 found this helpful

“I enjoyed the surprises. The changing progression conditions made me come up with new strategy on the fly. Only issue I had was sometimes not being sure where to click when I saw an "incident" I was supposed to point out.”

— a player, Steam review · 1 hrs played
Recommended · 0 found this helpful

“I'm probably the only person who plays riichi mahjong on my friends list. Seriously, someone from the local riichi community will probably find this and see my name and go, "Oh hey, that guy!" Funny Exit 8 game but mahjong.”

— a player, Steam review · 4 hrs played
Read more reviews ↗

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-09-26.

13achievements
6.3%median completion
1.2%rarest: Mahjong Everest
17.4% of players 14.6% of players 10.5% of players 8.6% of players 7.2% of players 7.0% of players 6.3% of players 4.4% of players 3.1% of players 2.2% of players 2.1% of players 1.6% of players 1.2% of players 17.4% 0% most earned rarest
Almost everyone has
17.4%Welcome to Anomaly Mahjong — Point out your first anomaly
14.6%Condition Breakthrough — Win your first Condition Match
10.5%Escape from Endless Mahjong — Reached the end of the game
Rarest badges of honor
1.2%Mahjong Everest — Exceed 150 tiles remaining in the wall
1.6%Anomaly Breaker — Discovered the path to win in anomaly No.7
2.1%Subspace Kan — Performed a Daiminkan in anomaly No.11

Latest official news

Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.

Jun 27, 2026
Ver1.34 2026 Summer Sale Update

・Added Anomaly No.48. ・Adjusted the difficulty. ・Fixed missing translations. ・Made system improvements and minor adjustments.

Jun 03, 2026
Ver1.33 Update

Fixed an issue in No. 2 Score Attack where an invalid winning hand could incorrectly be judged as a valid win. As a result of this fix, the No. 2 Score Attack leaderboard has been reset. Adjusted some

Mar 13, 2026
Ver1.31 Spring Sale Update

Added Anomaly No.45 Anomaly No.24 can no longer be reported; added Anomaly No.46 Anomaly No.9 can no longer be reported; added Anomaly No.47 Other text adjustments

Jan 29, 2026
Ver1.30 Update

・Added difficulty selection. ・You can now view the answer when you miss an anomaly. ・Enlarged the riichi stick. ・Added Anomaly No.44.

Dec 31, 2025
Happy New Year 2026!!! Ver1.29 Update

Happy New Year! Thank you for your continued support of Ihen Mahjong in 2026. ・Added Ihen No.43. ・Fixed an issue where No.5 could unintentionally end the round early. ・Adjusted tile layout for No.24.

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Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-09-26.

GenresCasual, Indie, Simulation, Strategy
Player tagsStrategy · Turn-Based Tactics · PvE · Board Game · 3D · Gambling · Indie · Casual · Simulation · Singleplayer (SteamSpy community voting)
FeaturesSingle-player · Steam Achievements · Family Sharing
LanguagesJapanese, English, Simplified Chinese, Traditional Chinese, Korean
Achievements13
Minimum system requirements (PC)

Minimum: Requires a 64-bit processor and operating system OS: Windows 10 Processor: Intel Core i7-6700 Memory: 8 GB RAM Graphics: NVIDIA GeForce GTX 1060 3GB DirectX: Version 12 Storage: 2 GB available space