Croteam has chosen the path of comedy to sponsor Serious Sam 3. It was in fact released a new hilarious video in which the coach Rich Knuckles explains, with its rather bizarre ways, as it is fun to play co-op with Serious Sam 3. Between a joke and the other in the movie we can see some part of the gameplay on its own co-op between four players. Enjoy!

Serious Sam 3 - Episode II Help Line | HD version