I don't really understand what one does with a Bingo Card created by this software. Is this an American teaching method that's common?
Then start calling things like "This center of the cell is where the chromosomes are stored". Kids mark "nucleus" on their bingo card. Repeat a few times -- somebody wins, the rest of the class comes close to winning (this is the diabolically brilliant thing about bingo), everybody is happy and most don't realize they've just reviewed some vocabulary.
Yes, this is a quite common activity in America. You'll find it in almost any book of teacher activities from elementary school through high school.
Bingo has a few features which make it particularly good from the teacher's perspective, incidentally. It scales to any number of kids with one teacher (not true of all games), it performs excellent crowd control since all students are forced to proceed at the same pace (very not true of all games), it doesn't pit students directly against one another (many American teachers do not believe that is wise), it is very difficult to be bad at bingo (in a way it is not difficult to be bad at e.g. spelling bees), there is an element of luck involved so the winner will almost certainly not be the strongest student in the class (some teachers believe this is wise), etc etc.
[I'm in Australia, a close relative was a secondary school teacher, and I've never heard of it. But sounds like a great idea, and you have a great pitch for selling it]
very minor nit: nice to distinguish in some way the final month (May) in the chart as incomplete (or not show it).
The audience of biology teachers is much, much wider than the audience of "people looking for biology bingo", and it being more diffuse makes it harder to address via scalable marketing methods like SEO and AdWords. They're also much harder to convert, because I have to sell them on a) biology bingo, b) Bingo Card Creator, and b) paying $30 for it, whereas if I just try for folks who typed [biology bingo cards] into Google I get (a) for free.
I want to be someone's first bingo game about as much as Apple wants to make someone's first cell phone.
P.S. The game many Australians think of when they think of bingo is not the game on my website. Yay, internationalization.
So many sites assume the reader already knows what they're selling. Still, I can see that your customer acquisition costs must be much lower for those who already know, and your site speaks precisely to those people; and there seems to be enormous growth left in that segment.
I mainly mentioned it because it would be a beneficial thing to do for the world - a connotation of "evangelize".
Study this month confirms this and goes further: "near misses were most rewarding for the pathological gamblers, who experienced them as being almost as rewarding as a win."