Price cuts on Mario & Luigi: Dream Team Bros., Super Mario Bros., and New Super Luigi U.
Microsoft's consoles remains the best-selling in the US, but sales are down 50% year-on-year.
Nintendo fails in its bid to claim its first Wii U number 1.
No other single format game has held the No.1 spot for six weeks in succession.
But is only showing off the games already available – no sign of Super Mario 3D World, Pikmin or Mario Kart 8.
Mario and Luigi: Dream Team is new at No.3.