Also I think you should group and rename some things so it isn't misleading. Under Single Player - Campaign - Survival (FreePlay) - Pocket Dimension (SCP-106) Under Multiplayer - Cooperative - Versus The Versus and Coop seems like an interesting idea, however for Versus I think it should be max of 8...

For Multiplayer COOP you should place all players in different locations and they have to find each other. Would make sense and still have the "alone & scared" factor kind of.