the apocalypse has started, you are the one of Survivior that's armed, get ready...choose difficulty

Easy Mode:MalBot Species Can appear.

Medium Mode:MalBot And Happy96 Species Can Appear.

Hard Mode:MalBot, Happy96 And Utierror Species Can Appear.

Insane Mode:All Abnormal And Normal Species can appear, None of Utierror is friendly.

DLC Version:Add More Locations And Entities.