Rack-O is a Milton Bradley sequential-matching card game with the objective of obtaining 10 numbers, in numerical order, in one's hand.

[2] Rack-O was released in 1956 and is currently produced by Winning Moves Games USA.

The goal of each hand is to create a sequence of numbers in ascending order, starting at slot #1.

Other players receive 5 points for each card they have in ascending order, starting at slot #1 and ending when the sequence breaks.

An optional scoring system is "Bonus Rack-O", which awards extra points to the winner of the hand for having a sequence of consecutive numbers (such as 7, 8, 9).