Hearts are your sub-weapon ammunition, and managing them effectively is crucial. Don't waste hearts on trivial enemies if your whip can handle them. Save your sub-weapons for tougher foes, mini-bosses, and especially main bosses. Always try to have a good supply of hearts before entering a boss room. If you have a powerful sub-weapon like Holy Water or Axe, prioritize collecting hearts to maximize its usage. If you find a Double or Triple Shot, be extra mindful of your heart count, as these power-ups make sub-weapons incredibly potent but also consume hearts faster. Sometimes, it's better to skip a sub-weapon you don't need to ensure you have enough hearts for the one you prefer later on. Strategic heart collection and sub-weapon usage are hallmarks of a skilled Castlevania player.
