About this game
Sengoku Mahjong (1988) for the PC Engine, published by Hudson Soft.
Gallery
The Story Behind
Released on July 8, 1988, Sengoku Mahjong was the first mahjong game for the PC Engine — Hudson Soft's tenth title for the platform. The game placed players in the Warring States period of Japan, where territorial conquest happened across the mahjong table rather than the battlefield. The game used the HuCard format, one of Hudson's key selling points for the PC Engine — the compact card-based media that loaded instantly compared to competing cartridges and floppy disks of the era.
Tricks & Tales
Players could face twelve historical warlords including Date Masamune, Uesugi Kenshin, Takeda Shingen, Oda Nobunaga, and Toyotomi Hideyoshi. The game offered two modes: a standard match mode where you select three opponents, and a unification mode where you play as one of the twelve warlords aiming to conquer all of Japan through mahjong. The game featured two distinct modes: standard match mode (対戦モード) where players select three opponents for a four-player table, and conquest mode (合戦モード) where players assume the role of a warlord attempting to unify Japan tile by tile. Each warlord provided personality-driven advice during gameplay.
Collector's Guide
Region & Compatibility
The PC Engine (Japan) and TurboGrafx-16 (North America) share the same physical HuCard slot shape but are not compatible with each other's software. NEC deliberately reversed the data bus wiring between the two regions: data pin D0 on the PC Engine corresponds to D7 on the TurboGrafx-16, and so on through all eight lines. Beyond the hardware wiring difference, most North American HuCards contain region-checking code that detects a Japanese console and immediately crashes. Converters that electrically flip the data bus do exist and allow cross-region play. CD-ROM² discs themselves carry no region protection and play freely on both systems—however, the System Cards required to boot CD software are region-locked in the same way as HuCards, so a Japanese System Card cannot be used in a TurboGrafx-16 and vice versa.
Maintenance Tips
HuCard contacts are the most common maintenance point on the PC Engine and TurboGrafx-16. The card's edge connector oxidizes over decades of storage, causing failure-to-read and graphical glitches. Cleaning with 90%+ isopropyl alcohol on a cotton swab—gently wiping the gold contacts on the card itself—resolves most contact issues; stubborn oxidation responds to dedicated contact cleaners such as DeoxIT. Never blow into the card slot with your mouth, as moisture accelerates the very corrosion you are trying to remove. On systems equipped with the CD-ROM² or Super CD-ROM² add-on, the optical drive is subject to the same age-related laser and sled degradation seen in any CD system of that era; the laser assembly uses a KSS-220a-type unit on the Super CD-ROM² and replacement parts remain available.
Going deeper
Explore the machine this game ran on, and what to check before you buy or care for one:
What to Watch Out For
Before buying, these are the points worth knowing — from someone who handles original Japanese Sengoku Mahjong copies regularly.
Will this Japanese PC Engine HuCard work on a North American TurboGrafx-16?
Not without a hardware adapter. The TurboGrafx-16 and PC Engine use different data bus wiring at the cartridge slot level, making them physically incompatible without modification. A passive adapter such as the dbElectronics Turbo PC-Henshin allows Japanese HuCards to run on a TurboGrafx-16. Because this is a Japanese mahjong game with text-heavy gameplay, no English language version exists — all text is Japanese.
My HuCard won't start — how should I clean it?
HuCard contacts can be cleaned the same way as other cartridge formats: use a cotton swab dampened with 90%-or-higher isopropyl alcohol and wipe the gold edge connector gently. Let the card dry fully before inserting it into the console. Never blow into the card — moisture from your breath corrodes the contacts over time, making the problem worse.
Before You Buy
Things worth knowing before you buy Sengoku Mahjong
A short checklist for buying used PC Engine software wisely — useful with any seller, anywhere.
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Choose a seller who tests it before shipping
A copy that has actually been powered on and checked is a known quantity. An untested one is a gamble you only settle after it arrives.
Look for a seller who states it was function-tested and says what they confirmed. A serious seller can tell you exactly what was checked.
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Make sure it fits your console
Japanese PC Engine HuCards and CDs are not compatible with the North American TurboGrafx-16 — the formats differ. Use a Japanese PC Engine system.
Play it on a matching Japanese console or a region-free system, and confirm the listing states the region.
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HuCard or CD-ROM² — know which you're buying
PC Engine games come on HuCard chips or on CD-ROM². CD titles also require the right CD system and a working System Card.
Confirm the format in the listing, and for CDs check the disc surface and that saves are supported.
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Check that the contacts are clean
Dirty edge contacts are the most common cause of startup and sound trouble in cartridges of this age.
Choose a seller who cleans the contacts before shipping. A note that it was tested and cleaned means the basics were handled.
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Read the seller's reviews and return policy
A 100% positive record across thousands of sales is close to a guarantee — packing, communication and problem-solving all work for everyone. A return policy protects you if something is off.
Read the feedback and confirm a clear return window before you buy.
The last step before buying anywhere is knowing what it's worth.
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