This is a used game. It has been tested and works fine.
May have some scuffs, marks, stains, or other cosmetic damage. Buy under the assumption that the battery will not hold your save. I sadly don't posses the tools or skills to replace the battery in the cart.
Game Boy and Game Boy Color games are not region locked. So you will not need a Japanese system to play this.
****Please closely inspect photos before making a purchase. Thanks!****