GUIDE · AGE OF EMPIRES II REFERENCE
Age of Empires II upgrades
An overview of how Age of Empires II upgrades improve units, buildings, and the economy through research. Individual technologies and unit lines remain indexed as separate articles.

Overview
An overview of how Age of Empires II upgrades improve units, buildings, and the economy through research. Individual technologies and unit lines remain indexed as separate articles.
How this system affects decisions
Treat research as a sequence of choices: check its building, Age, prerequisite, cost, and the units or economy affected. An upgrade is most valuable when it arrives before the army needs it and improves enough of the units already in production; researching every available technology is rarely the best use of a limited stockpile.
How to use this reference
An overview of how Age of Empires II upgrades improve units, buildings, and the economy through research. Individual technologies and unit lines remain indexed as separate articles. The mechanic affects the pace at which resources can be gathered, exchanged, or spent. Compare its immediate cost with the production or research it delays, especially before an Age advance.
- Also known as
- Upgrade (Age of Empires II)
- Focus
- Upgrade reference
- Signature / category
- Game reference
- Release / context
- Age of Empires II
- Region
- Age of Empires II reference
- Classification
- Game systems