This is a game in which the gameboard contains a sequence of twelve or sixteen cards which have been shuffled and placed in random positions. Players must select the cards in the correct order. In selecting the cards, the player will become familiar with the sequence. Note that this activity requires players to work at speed. Selecting the cards slowly might mean that the player is just working out which is the next lowest card, but quick selection requires the player to be thinking about the sequence itself.
Players that know the sequence well might like to try the 'face-down' option for an extra challenge!