Mission Mode, the big one, includes 25 self-contained survival stages that feature trials not found in the normal single-player story.

Karma Attack missions challenge you to obtain the highest score, while Survival missions dish out a single weapon and then throw enemies at you until you kick the ninja bucket. Sounds decent enough to grab our attention, but a co-op patch would be lovely...

While we're at it, 30 free videos (in three convenient packs) reveal the locations of the hidden in-game skulls, and are up on Marketplace now. Have a look, you dirty cheaters.