There are a number of free bingo games like Bingo Blitz, that are free to play with no deposit required. That's right! You can just play bingo for free.
Play one scorecard (or more) of 25 squares, with random numbers. Each time a number is announced, daub it on your scorecard/s. The winner is the player who reaches either 5 consecutive numbered daubed, or the entire scorecard. The winner shouts 'Bingo' and has their scorecard checked.
When a player has a BINGO (5 in a row, column, or diagonal), he or she calls out BINGO. The game pauses while the card is verified. If indeed a winner, the game stops and a new game begins.