Solution Puzzle Lab Mirror: Three Odd Yetis - Test Subject (8/8), Hearthstone Boomsday [UPDATED] - YouTube
Mirror Puzzle - Hearthstone Wiki
The Boomsday Project Adventure - Hearthstone | Battle.net
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Hearthstone Puzzle Lab: Puzzle solutions and answers walkthrough | Rock Paper Shotgun
Hearthstone Puzzle Lab: Test Subject Mirror puzzle solutions | Rock Paper Shotgun
Dr. Boom Puzzle Lab Solutions Guide - Dr. Boom Puzzles List, Answers, & Tips - Hearthstone Top Decks