Could also be an unlockable? Something you earn over time. I also like how the Digimon Pendulum handles the concept: if you ace a minigame, it gives you max hearts.
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Unlockables is something I had in my list from the beginning but just couldn’t figure out how I’d work it in while maintaining the old school look and feel. I opted that I would have unlockables in my next pet game.
Doing the mini game perfectly maxing hearts I really really love. That may be what I do. I only had the digimin 20th anniversary and X. That’s a cool feature.