Researching is an action that can be done by tapping the arrow icon that points up (if available) and tapping any research you want to do. Researching can usually allow you to train advanced units, unlock special abilities for units, increase the population limit or increase the strenght and defense for units. Several buildings don't have the research icon because there are no researches for that specific building or you have researched all of them.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.