What are the best-selling games in America, Japan, and Europe (UK) this week according to Amazon? Mario Kart Wii keeps finishing first on the Wii chart. Assassin's Creed returns on the top of the Xbox 360 chart after a discount to $24. PS3 exclusive Metal Gear Solid 4 remains at #1. The Diablo Battle Chest rises from hell to claim the PC top spot.