Nuclear Weapons - Nuclear weapons are expensive at $200,000 and with each active nuclear weapon in your possession the price of nukes increases by 10%. In addition to the initial cost, nuclear weapons also have a starting cost of $5,000 a day to maintain (Upkeep cost is doubled if you do not have access to Uranium). This cost increases +10% for every nuclear weapon that you own. Your nation will need a technology level of 75 or greater, an infrastructure level of 500 or greater, access to uranium for nuclear weapon production, and be ranked within the top 5% nations in order to begin purchasing nuclear weapons (Or own the Manhattan Project wonder). A player can only purchase 1 nuclear weapon per day (2 with the Weapons Research Complex wonder).

Nuclear weapons are extremely devastating to nations being attacked by them. Nuclear weapons completely reduce the number of defending soldiers for a defending nation to zero (50% Survival if the defending nations has the Fallout Shelter System wonder), cause great amounts of cruise missile, tanks, land, technology, and infrastructure losses (35% each up to a base limit before the techbonus of 150 land, 150 infrastructure, and 50 technology), reduce defending aircraft and defending Corvettes, Landing Ships, Cruisers, and Frigates by 75%, and also cause population happiness to plummet for a period of 5 days after a nuclear attack. Nuclear weapons may not be launched until after 24 hours after declaring war.