Boom. In brief: Mario at number one, reclaiming top spot. Valkyria 2 has strong start, Kingdom Hearts slipping to mid-table, Wii Sports Resort, MHP 2nd G, Wii Fit Plus, Tomodachi Collection rank in high. Full list below:

Rank / Title / Platform / Genre / Developer / Sale date (JP)
1. New Super Mario Bros. Wii - Wii - Action - Nintendo - 03/12/2009
2. Senshou no Valkyria 2 Gallia: Ouritsu Shikan Kakkou - PSP - RPG - SEGA - 21/02/2010
3. Mahou Shoujo Lyrical nanoha A's Portable: The Battle of Aces - PSP - Action - Bandai Namco Games - 21/02/2010
4. Tomodachi Collection - NDS - Other - Nintendo - 18/06/2009
5. Kingdom Hearts: Birth by Sleep - PSP - Action RPG - Square Enix - 09/01/2010
6. Wii Fit Plus - Wii - Other - Nintendo - 01/10/2009
7. Biohazard: Darkside Chronicles 0 Wii - Simulation - Capcom - 14/01/2010
8. Wii Sports Resort - Wii - Action - Nintendo - 25/06/2009
9. Monster Hunter Portable 2nd G (PSP The Best) - PSP - Action - Capcom - 24/12/2009
10. Pokémon Heart Gold/Soul Silver - NDS - RPG - Pokémon Company - 12/09/2009

[Source: Famitsu]

Famitsu Game Rankings are sales figures collected and compiled by Japanese magazine company; Famitsu. They are generally posted every Wednesday and reflect the sales of games from the past week. All sales dates are Japanese dates and may not reflect release dates from other regions. 50Hz Blogger transliterates these lists and places them on the blog every week. Check back every Wednesday for updates. (Sometimes there may be an unexpected delay, in which case readers may find them appear on a Thursday or Friday.)