If you play games and you've managed to not hear about the Assassin's Creed series, then you've done well. Arguably the biggest new IP to emerge from the last generation of consoles, Ubisoft has been busy expanding the narrative and offering more and more experiences for gamers to enjoy across multiple formats. This includes iOS, which got a maritime themed spin-off in Assassin's Creed: Pirates, a title that focused on the naval warfare made popular in bigger console brother, Assassin's Creed IV: Black Flag. The game is now officially free-to-play, which means the only thing you have to do to experience it for yourself, is click this link to the App Store.
It's not the only free Assassin's Creed experience on the App Store. More recently, Ubisoft released the collectible card game Assassin's Creed: Memories, which is also well worth a look.