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Official Mutations for all modes

NOTE: Melee unlock is required for Four Swordsman Survival/Versus and The Last Samurai to function properly

These select official Left 4 Dead 2 mutations can now be played in all co-op, versus, survival and solo modes. This includes:

Bleed Out (Survival and Solo)
Chainsaw Massacre (Versus, Survival and Solo)
Confogl (Co-op, Survival and Solo)
Death's Door (Versus, Survival and Solo)
Flu Season (Versus, Survival and Solo)
Four Swordsmen (Versus and Survival)
Gib Fest (Versus, Survival and Solo)
Hard Eight (Versus, Survival and Solo)
Headshot! (Versus, Survival and Solo)
Healing Gnome (Versus, Survival and Solo)
Healthpackalypse (Co-op, Survival and Solo)
Hunting Party (Versus, Survival and Solo)
Iron Man (Solo)
L4D1 (Solo)
Nightmare (Co-op, Versus and Solo)
Riding my Survivor (Co-op, Survival and Solo)
Special Delivery (Versus, Survival and Solo)

Also includes bonus mutations such as:

The Last Samurai (A cut LMOE mutation featuring the Katana)
Four Gunmen (Lone Gunman with 4 players. Co-op, Versus and Survival)
Solo Survivor and Solo Survival (A completely vanilla experience other than reviving from incap and special infected instantly removing your health upon catching you)