Thanks to Heather Hurley and Kate Shoup for their valiant efforts to get this book into print after many delays and two versions of XNA! Thanks to Jim Perry, who is a Microsoft MVP and XNA forum contributor, for his excellent technical review and helpful critique. Thanks to my wife, Jennifer, and my kids, Jeremiah, Kayleigh, Kourtney, and Kaitlyn, for not just their love and support but also their feedback. Thanks go out to Mark Simpson (Prinz Eugn at Gamedev.net) for the artwork used in the multiplayer game featured in the last chapter.