Pokémon Go is a year old, and while Niantic is celebrating the smash mobile game’s first birthday with hat-wearing Pikachu sightings in the game and this July’s Pokémon Go Fest in Chicago, there’s also a big functional addition to the game: Raid Battles and the totally rebuilt Gym system.

Just rolled out over the last couple weeks, the Raid Battles hatch powerful Pokémon at Gyms throughout the game for limited-time showdowns—and up to 20 players can take them on at the same time, working together towards a big bounty. Meanwhile, the Gyms themselves have changed in structure, not only in the way they’re managed by teams and players but also in the way they parcel out rewards for staying put. 

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