NPR had a show in 2008 about a simulator that you could use to try your hand at balancing the Federal Budget. I had a link to it on here, because I think it's a great idea, and a great way to learn how our tax dollars were spent.
Plus it was a game, and a fun one!
It seems Budget Hero was retired in August 2014,
I found another, but it's not the same. Probably more detailed, but the world has gotten more complex, so I guess it makes sense.
Stabilize the Debt: An Online Exercise in Hard Choices