They gave him the console's name to carry — and a head big enough to do it.
In 1989, NEC and Hudson Soft needed their own Mario. The solution was a bald caveman whose name was built from the console itself: PC Genjin — 'PC Engine' plus 'caveman' in one pun. He fought with his head because Mario stomped with his feet; the design was deliberately opposite. The game became one of the PC Engine's best-sellers. But the real weight Bonk carried was in the name. When you call a character after the hardware, their success is your success, and their failure is your failure. There is no separation. Bonk didn't just represent the PC Engine — he was the PC Engine, walking around in a loincloth. That kind of commitment is rare. When it works, the character becomes inseparable from the platform. When it doesn't, both go down together. Bonk worked. But the commitment itself — putting the hardware's name on a character's back and saying 'this is us' — that stays remarkable either way.
— inspired by Hudson Soft's mascot strategy
About this game
Released in December 1989 in Japan as PC Genjin and in 1990 in North America as Bonk's Adventure, this platformer was Hudson Soft's answer to Nintendo's Mario — a mascot character designed specifically for the PC Engine. Bonk, a bald caveman with an oversized head, attacks enemies by headbutting them, a deliberate departure from Mario's stomp-based combat. The character originated in a magazine comic promoting the PC Engine and became a full game after reader enthusiasm. The Japanese title is a multi-layered pun: PC stands for both the console name and 'Pithecanthropus Computerus', while genjin means caveman. Bonk's Adventure became one of the best-selling games on the PC Engine.
Key Features
Bonk attacks enemies using three head-based moves: a standing headbutt, a jumping headbutt (automatic during jumps), and a diving headbutt from the air. He can also bite onto walls and ceilings to climb, swing from ropes with his teeth, and use meat power-ups to transform into stronger forms. The game features vibrant, cartoonish graphics designed to appeal to all ages, and includes bonus stages where Bonk rides a half-pipe to collect smileys.
Gallery
The Story Behind
Bonk's Adventure was part of the early 1990s console wars mascot race. While Sega would release Sonic the Hedgehog in 1991, Hudson Soft and NEC attempted to establish Bonk a year earlier as the PC Engine's answer to Mario. The character was created by Keisuke Abe and first appeared in a magazine comic series promoting the PC Engine. Reader response led Hudson Soft to develop a full game. Red Company designed the character and concept, Atlus handled most of the game development, and A.I. Company contributed background art, with Hudson Soft supervising. The game was successful enough to spawn multiple sequels and ports to Game Boy and NES.
Tricks & Tales
The Japanese title 'PC Genjin' is a triple pun: PC can stand for 'PC Engine' (the console), 'Pithecanthropus Computerus' (a humorous scientific name), and genjin means caveman. In North America, the character was marketed with attitude as a competitor to Mario, one year before Sonic's debut. The original PC Engine version has different level layouts and boss patterns compared to the TurboGrafx-16 release. Bonk can gain three power levels by eating meat, with the final level turning him temporarily invincible.
Collector's Guide
Region & Compatibility
The PC Engine (Japan) and TurboGrafx-16 (North America) are the same hardware with different cartridge slot shapes. A HuCard adapter allows Japanese games to run on North American consoles and vice versa. The Japanese version is titled 'PC Genjin', the North American version 'Bonk's Adventure', and the European version 'BC Kid'. Level layouts and some boss patterns differ between the Japanese PC Engine and North American TurboGrafx-16 versions.
Maintenance Tips
PC Engine HuCards have no battery and store no save data, so there is nothing to replace over time. The cards are more physically fragile than fully-enclosed cartridges — handle them carefully and store in protective cases. Clean the edge connectors with 90% or higher isopropyl alcohol if the game fails to boot. The PC Engine console itself is sensitive to dust; clean the card slot periodically. Never force a HuCard into the slot — if resistance is felt, check that the card is oriented correctly.
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 Bonk's Adventure copies regularly.
Does Bonk's Adventure save progress, or does it use passwords?
Bonk's Adventure does not save progress and has no password system. Each playthrough starts from the beginning. The game is designed to be completed in a single session, typically taking 1-2 hours for an experienced player. There is no battery inside the cartridge, which also means there is no battery to replace — a small relief for collectors.
Will a Japanese PC Engine HuCard work on a North American TurboGrafx-16?
Yes, with a physical adapter. The PC Engine and TurboGrafx-16 are the same hardware internally, but the cartridge slot shapes differ between regions. A HuCard adapter allows Japanese PC Engine cards to fit into a TurboGrafx-16. There is no region lock in the hardware itself — only the physical card shape differs. Note that some games have different level designs or content between Japanese and North American releases, including Bonk's Adventure.
How should I clean a PC Engine HuCard?
Apply 90% or higher isopropyl alcohol to a cotton swab and gently wipe the card's edge connectors. HuCards are more fragile than cartridges with full plastic shells — handle them carefully, as the exposed circuit board can be damaged by rough treatment. Store them in protective sleeves or cases when not in use. Never blow into the card slot or the card itself; moisture accelerates corrosion.
Before You Buy
Things worth knowing before you buy Bonk's Adventure
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.
See the unit we have →Unexpected Discoveries
Games you weren't looking for — but might be glad you found.
Rooms this game lives in
Wander deeper — explore the themed rooms where Bonk's Adventure sits alongside its kin.
Memories from around the world
This is a young museum, and this page is still waiting for its first voices. The memories people send reach Taisei personally, and the ones that move him find a home here over time — always with the writer's blessing. Yours could be the very first for this game.
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