Castle

Castle Level 4 -> Level 5

Requirements :

Iron: 1196 units

Uranium:1100 units

Oil:1151 units

Fermium:143 units

Power:30 units

Gold:195 units

Time: 27 minutes 32 seconds

Upgrading to level 4 bonus from Level 5 :

Build time : 14% -> 19% faster

Building Cost: 14% -> 19% cheaper

Citizen: 168 increased

Castle Level 6 -> Level 7

Requirements :

Iron: 2949 units

Uranium:2844 units

Oil:2909 units

Deuterium:352 units

Power:83 units

Gold:726 units

Time: 1 hr 28 minutes 43 seconds

Upgrading to level 7 bonus from Level 6 :

Build time : 23% -> 26% faster

Building Cost: 23% -> 26% cheaper

Citizen: 380 increased