Here's a gameplay of two full co-op rounds in WaW first zombies map just to give you guys an idea how long they last. As you may know in solo rounds are much shorter having only 24 zombies each round. In World at War Zombies co-op high rounds are harder compared to both: solo and Black Ops Zombies. We were mostly using Ray Guns, Thompson and Flamethrower. Teammates channel: / matomaster21 My main channel: / therelaxingend Call of Duty World at War Nazi Zombies 2 Player High Round Strategy.