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Watch trailer on Steam ↗Anomaly Mahjong
YUTAMARO WORLD · Published by YUTAMARO WORLD
Mixed — 65% positive (95 reviews) · 13 achievements
Last updated 28 Sept 2026
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"
£4.29
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Price history
Indie, Simulation, Strategy, Casual · 2024 · More under £5 games
Navigate through Anomaly Mahjong’s challenging rounds as you spot and solve puzzles within special abnormality-focused sessions. Perfect for fans of strategic simulations who enjoy the intricacies of Japanese Mahjong.
About this game
Can you escape from the never-ending strange Mahjong game?
※Knowledge of Japanese Mahjong is required to play this game.
"Strange Mahjong" is a Mahjong game where you need to notice "strange events" happening during the match. It consists of rounds where you must point out these "strange events" and rounds where you solve "Mahjong puzzles" under special conditions.
In the rounds where you need to point out "strange events," you'll have to click on problematic revealed tiles or discarded tiles if you notice something strange, like declaring a Reach (Riichi) while calling tiles, or calling tiles from the player directly across from you. If you finish a round without pointing out the strange event, you'll be sent back to the first round of East 1.

In the "Mahjong puzzle" rounds, you’ll be given specific conditions like "win or draw to proceed." You'll need to make the appropriate calls and tile discards to meet the clear conditions and proceed. If you fail to meet the conditions, you'll also be sent back to East 1.

Show off your Mahjong skills and aim for victory beyond the final round!
Note: While there is a "Strange Event Assist" function, you will need to understand the basic rules of Mahjong for smooth gameplay.
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System Requirements
Will my PC run this? →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
Recommended
- Requires a 64-bit processor and operating system
Supported Languages
Latest news
Patch NotesOfficial
Ver1.34 2026 Summer Sale Update
・Added Anomaly No.48. ・Adjusted the difficulty. ・Fixed missing translations. ・Made system improvements and minor adjustments.Read full article on Community Announcements (yutamaro3)Patch NotesOfficial
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 visual effects and animations. Fixed several minor issues.Read full article on Community Announcements (yutamaro3)Patch NotesOfficial
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 adjustmentsRead full article on Community Announcements (yutamaro3)Patch NotesOfficial
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.Read full article on Community Announcements (yutamaro3)Patch NotesOfficial
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. ・Improved the presentation of Ihen No.39 to make it easier to understand.Read full article on Community Announcements (yutamaro3)






