The aim of this modcomp is to upgrade units with hammers instead of gold.
Instead of just clicking on a unit and paying some gold to upgrade it, things are now a little more complicated. To upgrade a unit (say an archer) to another unit (a longbowman for example) you must move the archer to a city which is building a longbowman, then click on the upgrade button. The archer will disappear and 75% of the hammer cost of the archer will be reinvested into the longbowman, reducing the build time. When the longbowman is finished it will have all of the promotions of the archer and all of its experience.
Instead of just clicking on a unit and paying some gold to upgrade it, things are now a little more complicated. To upgrade a unit (say an archer) to another unit (a longbowman for example) you must move the archer to a city which is building a longbowman, then click on the upgrade button. The archer will disappear and 75% of the hammer cost of the archer will be reinvested into the longbowman, reducing the build time. When the longbowman is finished it will have all of the promotions of the archer and all of its experience.
