Well, can't forget playing-cards.
After all, they were the first type of cards. This seems like an ordinary deck (diamonds, clubs, spades, hearts etc) but the backs of each one have a Sonic theme. The pointing stock art is well colored, and placed over what looks like comic panels of a board game. However, no one knows if a board game of Sonic actually exists, or, if it does, why you would need an ordinary deck of playing cards to use it. The panels say things like "Go back 2 spaces" and other 'directions' with arrows.