Bill Gates's Washington Home

As part of Microsoft's charitable giving campaign, founder Bill Gates is again auctioning off a tour of his Medina, WA, home. Last year the tour sold for $8,600, but this year the bidding has already reached $35,000. You have to be a Microsoft employee to bid in the auction (which reportedly also includes "the world's best bologna sandwich," selling for $500), with all the proceeds benefiting charity.

When you're Bill Gates, the sky is the limit when it comes to designing your home. See if you can guess the answers to a few questions about his pricey pad.