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A strike is worth 10 points plus the number of pins knocked down by the player during their next two tries. If players do not score a strike but knock down all remaining on their second try, the frame is scored as a spare. A spare is worth 10 points plus the number of pins knocked down on the next try.
Thus, the bowler who rolls three strikes in a row in the first three frames gets credit for 30 points in the first frame. Bowling's perfect score, a 300 game, represents 12 strikes in a row--a total of 120 pins knocked down.