3 spheres If a bowler knocks down all ten pins in the tenth frame, he or she is permitted to toss three balls in that frame. This allows for a maximum of 12 strikes in a single game and a maximum score of 300 points, equating to a perfect game. The number of balls allowed in an average game is usually between 6 and 9. If a player gets a strike on every ball he or she rolls, then the maximum number of frames he or she can play in an average game is 90. This does not include any extra frames used if more than 10 pins are knocked over in a single roll of the dice. In professional bowling, it is common practice for bowlers to use balls of different colors to indicate how many strikes they have achieved. For example, a red ball is used when the bowler has achieved 10 strikes, while a yellow ball is used when the bowler has achieved 11 strikes. When a bowler uses up his or her allotted number of balls, either by striking them all or because they are rolled into the gutter, he or she will often say "roll 'em" or "shoot 'em". The person who asked the question will then tell the bowler where to place the remaining balls in order to continue playing.