Surely when you were a kid, you had your fair share of fun with thumb wrestling, whether it was with your peers or with your siblings. Well, the next time you introduce this tradition to your little ones, you might want to spruce things up a bit with the Thumb Wars. We’re talking about the Sleeve of Doom, which is a sleek, shiny, and sensational instrument of combat. Your thumb will square off with another contender, while all your eight fingers are locked together for an epic battle. There is even a book included with the $9.99 purchase that will cover a wide range of topics, including classic challenges, strategies, and training exercises all the way to fake outs, battle cries, costume ideas, and never-before-played games.