Being the connoisseur of education video games that I am, I was somewhat ecstatic to find Marketplace's Budget Hero game. The game play is extraordinary simple: budget options are presented in the form of cards which the player can choose to play. The simulator then shows what would happen under your modified budget.
Even I was surprised at how effective my "eliminate tax cuts and boost social program spending" technique worked. It was a bit disappointing that single payer health coverage wasn't an option though.