Original Game Boy & Game Boy Color: No region lock. Japanese cartridges work perfectly on US/EU consoles and vice versa. The hardware is identical worldwide.
Game Boy Advance: Also region-free. All GBA cartridges play on any GBA, GBA SP, Game Boy Micro, DS, or DS Lite regardless of region.
| System | Cartridge Region Lock? | Notes |
|---|---|---|
| Game Boy / Color | No | Fully compatible |
| Game Boy Advance | No | Fully compatible |
| Nintendo DS / 3DS (GBA slot) | Yes | Console region must match cart region |