Will your Game Boy game run on a real cartridge?
See if your homebrew ROM fits our cart, then play it here for testing. Files are not uploaded anywhere and stay on your device.
Original games only. No commercial games, backups, ROM hacks, or fan games.
Your game plays here.
- Move arrows or WASD
- A Z or K
- B X or J
- Start Enter
- Select Shift
A Game Boy ROM tester for homebrew developers
Masonic Workshop puts Game Boy games on real cartridges. This free tool shows if your .gb or .gbc ROM will fit our carts, whether you built it in GB Studio, GBDK, or RGBDS.
What the results mean
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Green: should work
MBC5 or no mapper, up to 8 MB ROM and 128 KB save.
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Yellow: test it or change it
Play through MBC3 or small MBC1 games. Rebuild games using a clock, MBC2, or large MBC1.
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Red: can't go on our cart
Special hardware, oversized games, invalid headers, and commercial games.
Questions
- Is my ROM uploaded?
- No. Everything runs in your browser.
- What is MBC5?
- The chip on our cart that lets a Game Boy reach more data: up to 8 MB of ROM and 128 KB of saves, but no clock.
- How do I rebuild for MBC5?
- Set the header's cartridge type to 0x1B, then update your bank-switching code. Use
rgbfix -m 0x1Bin RGBDS or-Wm-yt0x1Bwithlccin GBDK. - Does green guarantee it works?
- No. It's a prediction, and real hardware can differ, especially in timing-sensitive games.
- Can you put my game on a cartridge?
- Soon. Leave your email and we'll write once when cart orders open.