Jumbo Wasgij Mystery puzzle Bingo blunder 1000 pieces

Bingo Cheats! The bingo hall is packed and all players are sitting with their eyes glued to their cards and pins in hand, ready to collect the jackpot! At the front table someone shouts 'BINGO!', and the partying can begin… Or is it too good to be true? Were the winners lucky or did they get a helping hand filling in all the numbers? That's the picture you puzzle. Age from 12 years