Played on mobile for 4+ years. While most functions have not been an issue; persistent connectivity problems and the assortment of bugs that randomly occur make this unplayable for competitive players. Including serious Battlegrounds, Duels, ranked Hearthstone, and Arena, which all use rank systems are effected. There's never been a proper fix for disconnects and even worse is that reconnecting to games is no longer possible. Great PC game but the app is trash.