Hearthstone is the latest game in the Warcraft series, preceded by its famous big brother, World of Warcraft. Developed and published by Blizzard Entertainment, Hearthstone is a collectible online card game that allows cross-platform play! This turn-based card game with 30 cards is usually played in one-on-one matches with a randomly assigned opponent. Players pick a hero and use mana crystals to activate abilities, summon minions and ultimately, destroy the other player’s hero.