The 4th installment of everyones favorite 2D arcade shooter, Metal Slug is available via Xbox Live Arcade this morning. Due to the recent Live problems some are reporting that they have been unable to even access the Marketplace today. Looks like there are still a few lingering issues that MS needs to work out.

If you are one of the lucky ones who can actually get into the Marketplace, Metal Slug 3 will set you back 800 Microsoft Points.