Nintendo’s video game systems again increased their lead versus other platforms in May, according to the independent NPD Group, which tracks video game industry sales in the United States.

  

Four of the top 10 best-selling games of May play on Nintendo systems. These include Super Mario Galaxy™ 2 at No. 3 with more than 563,000 sold, New Super Mario Bros.™ Wii at No. 6 with more than 183,000 sold, Wii Fit Plus with the Wii Balance Board at No. 7 with more than 161,000 sold and Pokémon™ SoulSilver Version at No. 8 with more than 141,000 sold.