What's a lotto game number field? A number field is the set of numbers from which a lottery draws its winning numbers. Example: Florida lotto is a pick-6 from 53 numbers. 53 is the game's number field because there are 53 balls used in the machine, of which you choose 6 (the pick-size of the game). The lower the number field, generally the lower the odds of the game, so it is a good idea to pick a game to play with a smaller number field, especially when the pick size is also smaller, like 5/35 instead of 6/53.