The game appears to run on the honor system -- pick a category and an amount, then read the question. You can then ask to reveal the correct answer, and it's up to you whether you think you got it. If so, score yourself some points. Doing this, and then hitting continue, will blank that particular square from the board and require that you pick another one.
Cute idea. I could see it having some use in a classroom, perhaps as a study guide. Really, though, it's just a fancy way to do flashcards.
There's plenty more to be found at Jeopardy Labs.