Boomsday Project Mirror Puzzle #8 Now unsolvable because of Holy Smite buff (more in comments) : r/hearthstone
Access Granted to The Puzzle Lab! — Hearthstone — Blizzard News
Celestalon on Twitter: "AND WE'RE OFF! 3 Mysterious Puzzles have been found, hidden in the latest Hearthstone patch! Can YOU help solve them?! The community is gathering here to try to solve
Review: Hearthstone: The Boomsday Project – Destructoid