This is the "Mobile Trainer" software for the Game Boy Color. It's a Nintendo product from 2001 and is compatible with the Mobile System GB. I purchased it a few years ago and I think I've used it a few times (though I barely remember using it...). I've kept it stored in a bag, so there aren't many scratches or stains. ^_^ There is no box or instruction manual. If anyone is looking for it, how about it? [Brand] Nintendo [Category] Game Boy Color Software [Condition] No noticeable scratches or stains [Color] Blue-based [Model Number] CGB-B9AJ-JPN [Other] 2001 Nintendo Thank you.