Best friends-turned-business partners take on not only each other but roommates when they encounter a '50s diner-themed stack; siblings and a pair of cyclers confront a kids room-themed stack.
Two lovebirds battle it out against a mother-daughter duo on the supermarket stack; a married couple take on a tightknit pair of twins on the granny's attic stack.
A father-and-daughter duo fights to beat a pair of childhood friends; twin brothers take on a couple of best friends; the winners from each round face off for a chance to win the grand prize of $250,000.