The Main City Tech Tree is a map in the game which shows which technologies need to be researched to unlock others, which level needs to be attained before research can begin, and how much this will cost (in real-time nd gold) prior to researching in the player's main city. It can be used to plan out a strategy and help players maximise revenue in Culture, Economics or Militia without having to research technology which would not directly benefit their city in the short term.

Mainland Tech Tree

Update 3-9-2011