GungHo Online Entertainment America said today that its mobile game Puzzle & Dragons has surpassed 11 million downloads in North America since its release in 2012.

The title is also a big hit in Japan and the rest of the world, and it is now celebrating its fourth anniversary in North America. In honor of that, from now until November 13, fans will be able to enjoy special collectibles, bonuses, and other rewards in the game.

“GungHo Online Entertainment is proud of the massive success Puzzle & Dragons has achieved over the last four years, thanks to our dedicated fans,” said Jun Iwasaki, president and CEO of GungHo Online Entertainment America, in a statement. “We are fully committed to continue providing our players around the world innovative gameplay through new partnerships and engaging content for many more years to come.”

Puzzle & Dragons features an addictive combination of puzzle, dungeon-crawling, and monster-collecting gameplay. In the game, players capture, collect, and evolve thousands of elemental monsters while using quick thinking to chain combos and maximize the abilities and skills of their monsters. It is available on the iOS App Store, Google Play, and Amazon Appstore.

Sensor Tower estimates that Puzzle & Dragons revenues have exceeded $1 billion worldwide since 2012.