u/Indi-ish

Not exactly sure how it happened, but a flea somehow got inside my Tomy Skill Squares Shootin' Gallery. Does anyone know of any way to open these so that I can clean it out ? I've looked and there's no screws or anything. I REALLY hope I can get this fixed because these are almost never on ebay. It took me years before I found this one. Just noticed it last night.