We've seen mobile card-battling spinoffs come and go, but Hearthstone: Heroes of Warcraft is the real deal—just ask the millions upon millions of active players across Android, PC, and iOS. Hearthstone mines the rich setting of the Warcraft franchise to deliver a free collectible card game with plenty of character, heart, and strategy in tow.
And your phone is the perfect place for it, as you can hop on for a quick battle whether it's on the couch or in your cubicle. Hearthstone has a lot of opportunities to spend, and to be truly competitive against entrenched players, you'll either need money or a lot of time. But even for casual, free play, it's a very fun and addictive experience.
Hearthstone: Heroes of Warcraft (Free)