It is possible to upgrade Opa-Opa's weapons, bombs and flying engine to increase speed, as well as get extra lives. Before that, the player must get money by defeating enemies, bases or bosses, and access a shop by touching a marked balloon. Each time a new item is bought, they become more expensive. When the player chooses to exit or the time runs up, another screen appears, in which he or she can select what upgrades Opa-Opa can use; only one engine, weapon and bomb can be equipped at a time.