If you had to take a guess at what has been at or near the top-grossing spot in the U.S. iPad App Store for the past month without looking, I'd bet a bingo simulator wouldn't be high on your list. But
<a href="http://www.bitrhymes.com/">BitRhymes</a>, the San Francisco-gaming startup behind a bingo game that has attracted about 400,000 daily active users on Facebook, has raised $1 million in angel