Someone call a doctor!

When you're fighting against an enemy, it is imperative that you know how much life you have left, especially if you have the ability to heal yourself during a high-intensity shoot-out, or when you're the last man standing defending your team's title! In gamified applications, health can also be a way to provide players with a limited number of opportunities to fail, before having a cool down period and resuming the experience or prompting them to start again. In either case, health can be displayed in many different ways. You can have a series of hearts, a green bar, or you might have something such as a percentage next to an icon. For the purpose of this chapter, we will create a health counter like the one in the following ...

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