The object is to score points. Each round, you replace cards in your rack so their numbers read in any numerical progression from a low number at the front to a high one at the back (the racks hold the cards behind each other); achieving this ends the round. The cards are numbered from 1 to 60; you initially place them in your rack in the order they're dealt. On your turn, you draw from the deck or the discard pile, swapping the card with one from your rack.
The original publisher was Milton Bradley.