Ver1.34 2026 Summer Sale Update
・Added Anomaly No.48. ・Adjusted the difficulty. ・Fixed missing translations. ・Made system improvements and minor adjustments.
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"
| App ID | 3205000 |
|---|---|
| App type | Game |
| Developer | YUTAMARO WORLD |
| Publisher | YUTAMARO WORLD |
| Release date | 2024-09-26 15:00 UTC |
| Release state | released |
| Localized names | english Anomaly Mahjong koreana 이변 마작 schinese 异变麻将 tchinese 異變麻將 |
| Store page | store.steampowered.com/app/3205000 |
| Last store refresh | 5 hours ago |
| # | Executable | Arguments | OS | Description |
|---|---|---|---|---|
| 0 | Package/IMF.exe | windows | Start Game |
No player history yet. This app is now tracked, so data will appear within about ten minutes.
| Playing now | Not polled yet (never) |
|---|---|
| 24-hour peak | |
| All-time peak (tracked) |
All Steam store regions, converted to USD at today's exchange rate, compared with the US price. Lowest is the lowest price SteamRaw has recorded for that region.
Loading regional prices…
| Date | Price | Regular | Discount |
|---|---|---|---|
| 2026-09-11 22:02 UTC | $4.99 | $4.99 |
| DLC | AppID | Release | Price |
|---|---|---|---|
| No DLC known for this app. | |||
| Branch | Build ID | Description | Updated | Password |
|---|---|---|---|---|
| public | 23945960 | 2026-06-27 14:58 UTC |
| Depot | Name | OS | Size | Download | Public manifest | Notes |
|---|---|---|---|---|---|---|
| 228989 | windows | from app 228980 · shared install | ||||
| 228990 | windows | from app 228980 · shared install | ||||
| 3205001 | 831.21 MB | 710.66 MB | 4633822125173980672 |
A build is one published version of the game's files on a branch. Steam assigns a new build ID every time the developer pushes an update, so this list is the update history of the app. The files inside a build (depot manifests) are only readable with an account that owns the game, which SteamRaw does not have yet, so build contents are not shown.
| Build ID | Branch | Updated | First seen |
|---|---|---|---|
| 23945960 | public | 2026-06-27 14:58 UTC | 6 hours ago |
Every appinfo change SteamRaw has observed, grouped by changelist. Tags, features, languages, builds, depots, prices and any other key Steam publishes. Tracking since 2026-09-11 21:48 UTC.
No changes recorded since SteamRaw first saw this app. Every future PICS change will be listed here.
| Changelist | Apps | Packages | Seen | What changed |
|---|---|---|---|---|
| No changelists recorded for this app yet. | ||||
・Added Anomaly No.48. ・Adjusted the difficulty. ・Fixed missing translations. ・Made system improvements and minor adjustments.
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.
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
・Added difficulty selection. ・You can now view the answer when you miss an anomaly. ・Enlarged the riichi stick. ・Added Anomaly No.44.
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.
・Fixed an issue where the ranking was not displayed correctly.
・Adjusted lighting to improve tile visibility. ・Fixed an issue where the failure reason was not displayed after a false Tsumo in No.2. ・Added multilingual translations for the tutorial images.
・Achievements have been officially implemented. ・Fixed a bug where a Rinshan tile could be drawn when pointing out the anomaly in No.21 without declaring a concealed Kan.
Added anomalies No.38 to No.42. Added 3 new Score Attack modes. Changed the concept of anomaly No.1. Made it possible to point out anomalies in No.9 and No.24. Allowed winning by Furiten in anomaly No.11. Added a route in anomaly No.15 that can be cleared even with inefficient tile usage. Made anomaly No.21 occur without the need for a concealed Kan. Changed the anomaly selection method. Experimentally implemented achievements. Other changes include updated wording, display of “How to Play,” and showing the cause of failure.
The GGC Cup Strange Mahjong has concluded No.20 Score Attack mode has been added An in-game ranking system has been implemented Time continues to be measured even when the options menu is opened during Time Attack The title for No.5 Strange has been changed Routes for No.14 and No.16 have been added
Tournament Website
・Fixed an issue where the UI would break when set to other languages ・Corrected some translations
・Added a "Retry" function to "Final Time Attack."
・When failing in 'Final Time Attack' and returning to the first east round, the timer will now reset. ・Added an announcement for the GGC Cup.
・Added Time Attack mode ・Supports Simplified Chinese, Traditional Chinese, Korean, and English (may have deficiencies)
Full appinfo as delivered by Steam PICS, changenumber 36883307. Also at /api/app/3205000/raw.
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