Dominoes 2 uses playing cards instead of tiles. Allowing the cards to be stacked on top of each other inside a three by three tray. Rather than placing two identical numbers end to end. Players in Dominoes 2 must match two numbers directly on top of the identical numbers in the tray. The playing cards are held securely in place with pegs, allowing for many layers of cards to placed on top of one another. - BoardGameGeek