From the box:
Can you rack up the highest score?
It's a numbers race that takes a bit of strategy - and a bit of luck. As they're dealt, place your RACK-O cards in your card rack, one by one, and search for a pattern of lows to highs. As you draw new cards - or pick up good discards - replace the cards in your rack that "break" the sequence. The first player to get all 10 in perfect order - from low at the front to high at the back - wins.