Hearthstone’s latest expansion, The Boomsday Project, has been live for a bit now, but without its single-player campaign. But that’s all changed as of today now that The Puzzle Labs has been deployed. Players are given scenarios and cards to work through these puzzles, designed around four specific mechanics: Lethal, Mirror, Board Clear, and Survival. LETHAL –Classic puzzles that challenge intrepid interns to find a way to neutralize their opponents using only the cards in their hands. SURVIVAL – Restore your health and find a way to make it through these incredibly deadly puzzles in one piece. MIRROR – Create a board state that mimics the opponent’s—by any means necessary. BOARD CLEAR – Remove all minions from the board, including your own. Experimentation is encouraged, as there are often several possible solutions. To celebrate the release of The Puzzle Labs, Blizzard is giving away three free packs of The Boomsday Project cards just for logging in. You can learn more about The Puzzle Labs by visiting the Hearthstone site.