Portable, handheld... Barcode battler? Not,but CODE BATTLER,were you need to use CODE NUMBERS. Yes: random number combinations will create specific warriors for you and specific attacks. So same as barcode battlers but with numbers , not with barcodes (in fact, the same concept... bars are numbers on a barcode)
You can play alone or play against other player because device has IR port. And of course it is a CALCULATOR. Who did it? SEGA DID IT!!!
And i am talking about....
SEGA BOY´S ACTIVE