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.

A husband and wife work together against a pair of siblings; a newly engaged couple think they have what it takes to win.

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 married couple takes on a father-son duo; Nigerian siblings work together to beat two epidemiologists.

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.

A pair of brothers take on a team of best friends; a new couple attempts to avoid striking out against a married couple.

Two cheerleaders compete against a married couple; childhood friends take on two social media influencers.

In round one, siblings compete against a couple and take on the sports stack; in round two, a husband and wife take on family members.

A pair of best friends tries to defeat two competitive brothers; a couple takes on a pair of musical theater classmates.