Riot Games, developer of insanely successful online battle arena game League of Legends, has created a new game as a love letter to its fans. Titled Blitzcrank’s Poro Roundup, the side-scrolling game is available for Android, iOS and as a web app.

Blitzcrank’s Poro Roundup is an arcade-style side-scroller featuring the grabby-hands champion from League of Legends. It’s part of a big content pack for the MOBA game, and — like Fallout Shelter — is a way to extend the reach of a triple-A title into the mobile arena.

Unlike Fallout Shelter, Blitzcrank’s Poro Roundup will not have any in-app purchases or other money-making features; it’s purely a fun little game for fans of League of Legends.

You’ll play as Blitzcrank across 11 different story levels, fighting unique bosses pulled from the League of Legends roster, while collecting as many cute and fluffy little poros as you can. Are they sheep? Rams? We don’t know.

You can grab the game for free in the iOS App Store or Google Play, or you can play it right in your Flash-enabled web browser. Have at it, but act fast because you’ll only be able to get this game on your mobile devices until September 21.