Global top 5 of 2008 (U.S./Japan/U.K, NPD/GfK/Enterbrain)

2008* Top 5 Video Game Titles
Top Global Markets Report
Ranked By Units**

2008 Titles Publisher Total US Retail Japan Retail UK Retail
Mario Kart Wii Nintendo 8.94mil 5 mil 2mil 1.94mil
Wii Fit Nintendo 8.31mil 4.55mil 2.15mil 1.61mil
Grand Theft Auto IV Take 2 Interactive 7.29mil 5.18mil 256K 1.85mil
Super Smash Bros: Brawl Nintendo 6.32mil 4.17mil 1.75mil 404K
Call Of Duty: World At War Activision Blizzard 5.89mil 4.46mil 0 1.43mil

Source