There is no such thing as a free number in bingo. Every number has a corresponding bingo card, and each card has a certain number of squares that must be filled in for the number to be considered as a win.
Bonus cash is a term used to describe the additional money that a player can receive when they win a bingo game. It is often referred to as “free” money, as players do not need to participate in bonus rounds in order to receive it. Bonus cash is generally awarded in the form of a check or electronic transfer.