A throwback to the Red and Blue Back sets of 1951, the 33-cards in the 1968 Topps Game set, inserted into packs of regular '68 Topps cards or purchases as a complete boxed set, enable the owner to play a game of baseball based on the game situations on each card. Also on the 2-1/4" X 3-1/4" cards were a color photograph of a player and his facsimile autograph. One redeeming social value of the set (assuming you're not mesmerized by the game) is that it affords an inexpensive way to get big-name cards as the set is loaded with stars, but not at all popular with collectors. The Santo above is a NM-MT example - super.