A Tennis RPG on Game Boy Color, where your character trained from a cadet to a Mushroom Kingdom champion.
Mario Tennis for Game Boy Color was developed by Camelot and released in September 2000 — the companion game to the Nintendo 64 Mario Tennis, featuring a unique RPG mode where players created a custom character and progressed through a tennis academy, playing matches to earn experience points and improve stats. The character could be linked to the Nintendo 64 version, appearing in that game's roster. The RPG structure — a tennis school with structured progression, rivals, and a championship arc — gave the game a distinct narrative layer absent from the home console version. Mario Tennis GBC sold over 1 million copies and established the template for Camelot's subsequent Mario sports RPG designs.
About this game
Mario Tennis for Game Boy Color is the first handheld entry in the Mario Tennis series, released the same year as its Nintendo 64 counterpart. Uniquely for a sports title, it features an RPG-style story mode where the player creates a custom character — Alex or Nina — and works their way up from junior circuits to face Mario himself. Mario is locked behind story completion, not available from the start. The game supported Nintendo 64 Transfer Pak connectivity, allowing players to carry their trained GBC character into the N64 version.
Key Features
RPG story mode with a custom player character progressing through ranked tournaments. Nintendo 64 Transfer Pak support to carry a trained character into the N64 version. Full Mario cast including Yoshi, Bowser, DK, and others as opponents. Exhibition mode for quick match play.
Gallery
The Story Behind
In 2000, Camelot Software Planning delivered two Mario Tennis titles simultaneously — the ambitious N64 version and this GBC handheld companion. The transfer system between both versions was an early example of cross-platform character continuity in Nintendo's ecosystem. The game helped establish Camelot as Nintendo's dedicated sports RPG studio, a role they would continue with the Mario Golf and Golden Sun series.
Tricks & Tales
Mario himself is not selectable at the start — he must be unlocked by completing the RPG story mode. This design choice reinforced the idea that Mario's status in the game world was earned, not given. The GBC version introduced Alex and Nina, characters who would appear in later Mario Tennis entries.
Collector's Guide
Region & Compatibility
Like the original DMG, the Game Boy Color is fully region-free. Japanese, North American, and European GBC cartridges all share the same physical format and connector, and the hardware applies no lockout. A Japanese GBC cartridge will run on any GBC from any region without modification. The GBC is also fully backward compatible with original DMG cartridges — when a DMG cart is played on a GBC, the system automatically renders it with one of several colour palettes. GBC-specific cartridges (the 'GBC only' black-tab type) will not run on the original DMG, but will run on the Game Boy Advance as well as the GBC.
Maintenance Tips
Game Boy Color cartridges — the smaller, slightly translucent-shell format — use the same cleaning approach as original DMG carts: a cotton swab with 90% or higher isopropyl alcohol wiped along the contact row, allowed to dry fully before reinsertion. The GBC console's ABS plastic shell faces the same yellowing risk as the DMG when exposed to UV light over time. Notably, several GBC titles — most famously Pokémon Gold, Silver, and Crystal — include a real-time clock (RTC) circuit that runs continuously off a CR2025 coin cell. These batteries are now well over 25 years old; a dead RTC battery means time-based in-game events will not advance, even though the game itself will still load and save normally. This is a distinct issue from save data loss.
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 Mario Tennis copies regularly.
Is this a region-free game? Will a Japanese Game Boy cartridge work on any Game Boy console?
Yes. The original Game Boy, Game Boy Pocket, and Game Boy Color have no hardware region lock — a Japanese cartridge plays on any Game Boy or Game Boy Color console worldwide without modification. The game itself is in Japanese, but the hardware accepts it freely. Game Boy Advance consoles are also backward-compatible with Game Boy and Game Boy Color cartridges and share this region-free status.
How should I clean a Game Boy cartridge?
Apply 90% or higher isopropyl alcohol to a cotton swab and gently wipe the gold-plated edge contacts on the base of the cartridge. Never blow into the cartridge — breath moisture accelerates contact corrosion. If the shell needs to be opened for deeper cleaning, Game Boy cartridges use 3.8mm security game bit screws. The contacts are small; clean with a gentle wiping motion rather than abrasive pressure.
Before You Buy
Things worth knowing before you buy Mario Tennis
A short checklist for buying a used Game Boy Color cartridge 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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Good news — Game Boy Color is region-free
These cartridges are not region-locked, so a Japanese copy plays on any compatible Game Boy worldwide.
Confirm whether the title is Color-only or also works on the original Game Boy.
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If this title saves your progress, check the battery
Cartridges that save use a small coin-cell battery that fades over decades — a dead one wipes your save without warning.
Ask the seller whether the save function was tested. Replacing the battery is possible, but doing so erases any existing save.
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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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