Complete Bandai solar shell + solar shell small + extra Sakura game. 4 games out of 5 from each serial has a counterpart in the other serial:
Breakout Shark Island Nazono Pyramid Sub Attack
Nazono Chinbotsusen and Tengoku & Jigoku has no matching pair on the other series. Sakura: Space Shuttle is an extra, it has the same form factor as the small shells but it has a mirror in place of the usual solar panel and uses batteries for power source.