The first G called in the game will dictate the number of calls Bingo has to be won in in order to win the G Ball Progressive Jackpot. For instance if the first ball called is G46, then it must be won within 46 calls.
In the event that it is not won, then it is simply 'rolled over' to the next playing slot. Cards cost only 10p and JP starts of at £25 and grows by £5 each time it is not won!