This is a fun game that can be used throughout the school year but would be great to use for some back to school fun during a center. Addition facts are on colored pencils game cards to be used all at once or differentiated depending on the need of the children playing the game. Pencil playing cards include addition facts to 5 and to 10 as well as fun card that have players move up or back on the board. Addition. RTI Game. Differentiated. Center Game.