PrimePak - Four Card Games Master multiplication, division and factoring skills while having fun playing card games with this unique deck of 171 cards. In all four games players form factor sets. Because 80 = 8 x 10, the numbers 80, 8 and 10 form a factor set. Factor sets can have more than three numbers. For example, the set 42, 3, 2 and 7 is also a factor set. Prime wild cards are used for prime numbers only. Adapts to 6 levels. For 1 to 6 players. Ages 7 to adult. Prime Challenge - Players in turn form factor sets from a 12-card (or 10-card) foundation. Challenges are made by opponents when a player overlooks factor sets or makes a mistake. Prime Solitare - To win, a player must clear a foundation by forming factor sets. This must be done before going through the draw pile once, one card at a time. Factor Rummy - Holding a hand of 11 (or 10) cards, players try to be the first to fill their hand with factor sets. Prime Canasta - A sophisticated Factor Rummy game. For serious game players. SIX DECK LEVELS The PrimePak deck of 171 cards adapts to many levels by removing certain cards. Six deck levels are defined in the rules booklet. Players play with deck level 1 (then 2 and 3) until they have mastered the multiplication facts. They continue playing at level 3 until they learn to think of numbers in factored form. The rules booklet includes important divisibility rules and factoring strategies.