<Li> A Singleplayer mode allows players to play without intrusion from human players, working through the Campaign stages with three computer - controlled Survivor allies . </Li> <Li> Versus: up to four other human players take control of various Special Infected to try and prevent the Survivors from completing a stage . Special Infected are randomly assigned to Infected players; they cannot control the Witch or any Common Infected . Occasionally, as determined by the AI Director, certain players will become the Tank . The two teams swap sides once per stage, and are scored based on their stage progress as Survivors . If both teams make it to the saferoom with all four Survivors, a 25 - point tiebreaker is awarded to the team that dealt the most combined damage as Special Infected . </Li> <Li> Survival: a timed challenge where the Survivors are trapped in a section of the campaign maps, and try to survive as long as possible against an unending onslaught of Infected . </Li> <Li> Scavenge: a new 4 - on - 4 mode that requires the Survivor players to collect and use as many fuel cans scattered about a level to fill up a power generator, while the Infected players attempt to stop them . </Li>

When does the new left for dead come out