The Lunatic Variant changes a couple of things compared to the other variants, this mutation uses co-op rules:
- Incap health is halved (1.5 minutes of bleed out time compared to 3 minutes)
- Ledge Incap health is also halved
- You have one down
- Reviving your teammate takes 4 seconds (with adrenaline it still takes 2.5 seconds)
- Friendly fire is increased to 70% of your weapon's damage (Snipers will do 63 FF damage, pistols will do 18.2 FF damage, uzi will do 14 FF damage, etc.)
- Friendly fire applies on Easy, uses the above percentage.
- Rescue closets are disabled
- When revived via defib or from level transition, you will have 35 health (excluding loading into finale levels)
- The Tank does 1.5x more damage:

• Easy & Normal: 36 HP, 112.5 HP on downed survivors (One hit is survivable)
  
• Advanced: 49.5 HP, 150 HP on downed survivors (Instant death)
  
• Expert: 150 HP, 225 HP on downed survivors (Instant death)

- Shotguns do 2.5x Damage in close range (by default it does 5x), Witch cannot be crowned with one shot.

This may potentially be changed or an even harder variant may be added if there is enough demand.