Bottle Caps

 were a limited-time currency available during the Springfield Games 2016 Event. Their only use was to be exchanged in groups of 30 for Springfield Games Pins the player haven't collected yet.

They only obtained as a reward by either Pin Collector Lisa's Play the Saxophone for Pins job, or tapping the roaming Fatov, and only if the pin awarded on either case was already owned by the player.

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