The most immediate new addition to Left 4 Dead 2 that The Passing DLC pack brings however, is are those which appear directly on the main menu. Along with the new Mutation mode heading up the mode select bar, and in game Blog appears with the options and Achievements menus, promising to be updated every Thursday with the details of the next Mutation commencing on Fridays. Mutation mode is a tweaked and manipulated version of the game rules that can apply in any game mode. "Realism Versus" is the first week's gameplay mode, offering the infected a very friendly advantage. In addition to the mutations updates, the blog will occasionally offer surveys and such, giving Valve a direct point of contact with their fanbase. Though only available to those with The Passing DLC, Mutation mode will be set across any, and possibly every map.