Play free bingo online for fun--not for money?

Where can I find a site that will let you play bingo online for fun. Like you would play solitaire on your computer at home. My grandma wants to play for fun; she doesn't want to win prizes or chat with people. She just wants to play a 1-player game of bingo for fun. Thanks if you can help. And yes, I have checked online and no I'm not looking for anything like games.com etc.