This booster pack for Skittykitts includes ten (10) extra character cards. To use one (1) of these characters in the game, simply remove of the the four (4) core characters from the base Skittykitts deck, as well as the core characters "cannot win the game" card. Replace those with the special card card you want to use as well as the "special character cannot win the game" card. Be warned: These special characters are play test characters and some may be over-powered and some may be under-powered. Try them out and have fun!