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Illegal Mahjong
Yuri, the former heiress of a company, finds her father's business bankrupt. To repay the debts, Yuri must compete in mahjong and continue to win. Can Yuri truly defeat her formidable opponents?
What players say
Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-26.
“"Oh a classic mahjong game, with a relaxing gameplay.... wait why that girl in the crupier outfit is uncovering her breasts and turning herself on?" Review Illegal Mahjong is basically a traditional Mahjong game where you will have to play matches of this game and win to advance…”
— a player, Steam review · 2 hrs played“came for booba, left with a new found understanding of mahjong, its interesting”
— a player, Steam review · 2 hrs played“Don't forget to install the R18 patch. A great casual mahjong game. No tutorial in-game. You need basic mahjong knowledge to play it.”
— a player, Steam review · 1 hrs playedAchievement 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.
Latest official news
Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.
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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.
| Genres | Adventure, Indie, RPG |
| Player tags | Nudity · Sexual Content · NSFW · Mahjong · Adventure · RPG · Female Protagonist · Turn-Based Strategy · JRPG · Board Game · Turn-Based Tactics · Anime (SteamSpy community voting) |
| Features | Single-player · Family Sharing |
| Languages | Japanese * , English, Simplified Chinese, Traditional Chinese * |
| Achievements | 8 |
Minimum system requirements (PC)
Minimum: OS: 7 / 8 / 8.1 / 10 Processor: 3+ GHz Processor Memory: 4 GB RAM Graphics: DirectX 11/OpenGL 4.1 capable GPU DirectX: Version 11 Storage: 1 GB available space