Research Guide
Combat Research
Tier 1
- Recon
Tier 2
- Recruiting Speed
Tier 3
- Combat Drills
- Vehicular Manslaughter
- Demolitions Expert
Tier 4
- Armor Up
- Vehicle Defense
- Demolitions Defense
Tier 5
- Rifleman
- Armored Jeep
- Demolitions Expert
Tier 6
- Infected Among Us
- Runner
- Infected Defense
Tier 7
- Soldier
- Battle Bus
- Pyro
Tier 8
- Health Care
- Bloated
- Troop Defense
Tier 9
- Commando
- Zombie Dozer
- Boomer
Tier 10
- Elite
Trap Research
Tier 1
- Fortifications Expert
Tier 2
- Watch Tower
- Spike Strip
- Barbed Wire
Tier 3
- Defense Durability
- Defensive Power
Tier 4
- Trip Wire
- Barricades
- Razor Wire
Tier 5
- Sentry Turret
- Mortar
- Mines
Tier 6
- Sniper Nest
- RPG Nest
- Machine Gun Nest
Economic Research
Tier 1
- Improved Construction
Tier 2
- Oil Baron
- Plant Whisperer
- Heavy Metal
Tier 3
- Carrying Capacity
- Lumberjack
- Forced March
Tier 4
- Gathering Speed
