Civ2civ3 is a ruleset shipped with Freeciv 2.5 and later, designed to be the new default ruleset later. The ruleset is based on earlier modpacks for 2.4 (civ2civ3) and 2.3 (civ2-3). The former default ruleset was renamed to classic. The ruleset supports three additional governments tribal, fundamentalism, and federation. It uses the same values for [effect_empire_size_base_…] and [effect_empire_size_step_…], i.e., the first citizen unhappy about an empire with many cities appears at the same rate as the next citizen unhappy about this issue.