Metal Gear Solid: Peace Walker Had A Very Impressive First Week On The Japanese Software Charts.

To be precise, the game shifted 425,000 units. DS game Dragon Quest Monsters Joker 2 outsold it by some 200,000 units - but it's still a staggering performance for the PSP's sneak 'em up.

Super Street Fighter IV came in at the third on the Japanese software charts, shifting 81,000 copies on the PS3. You can get the full charts through the link.