Der Riese is the third Zombie Map, which is available to download with the third map pack.
According to callofduty.com:
The undead horde approaches! Fight for your life in "Der Riese" (Zombie Factory), an all-new Zombie map set in a secret Nazi research facility featuring the Pack A Punch Machine, a device capable of upgrading weapons at the touch of a button. Use the teleporters to escape the vicious Hell Hounds and pray that the Wunderwaffe will appear before it's too late. This map includes 10 new Achievements/Trophies.
Related ThreadsDer Riese buddiies? - last post by @ Dec 8, 2010
Clock In Der Riese - last post by @ Aug 1, 2010
Yet another glitch/update for Der Riese - last post by @ Jan 15, 2010
Music on Der Riese - last post by @ Sep 29, 2010
Anyone decent want to play der riese on black ops? Xbox 360 - last post by @ Mar 18, 2012
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