backbox.jpg:
Table Ball = playing vs the wrestler in 'Shufflepuck Cafe (J).nes', without any changes
Paddle Ball = one of the minigames in 'Pyokotan no Dai Meiro (J).nes', some graphics changes
Bulls-Eye = Archery in 'Track & Field (U).nes', status bar moved to the bottom

We can't identify the chips on that pcb unless you scrape off that black mess (common thing in pirate boards) ;p