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The Jar is an activated item in Rebirth that collects and stores red hearts for later use. If you pick up a red heart while your heart containers are all full, The Jar will collect it.
- The Jar can hold up to 4 hearts
- Activating The Jar releases all the hearts contained within (and resets the contents of The Jar to empty)
- The Jar has no cooldown, so it can be used multiple times in a single room, as long as it contains hearts