These can be activated on the game interface by clicking on a crown in the top right corner. In Empire Earth II, each civilization belongs to a particular world region, each having its own regional powers. However, when research is no longer used (at the highest epoch specified before starting a game), the garrisoned units will become idle. When the correct number of tech points are available, the tech tree button will light up and new technology to research can be chosen. Technologies are researched through the main interface (no longer through a building) by clicking the Technology Tree button. To get tech points, an appropriate number of citizens must be garrisoned in a university and/or an appropriate number of priests must be garrisoned in a temple.

Technologies can be researched by spending tech points. There are four technologies of each group for each epoch. The final group is Imperial, which provides benefits mostly to special units and increases the health of units and buildings. The next is Economic technologies, which increases resource gathering rate, decreases cost and building time for units and buildings and decreases tribute tax amount. The first is Military, which provides benefits mostly to military units. Technologies are divided into three groups. These special resources are tin-available until epoch 6, iron-first available in epoch 4 and is no longer used after epoch 9, saltpeter-first available in epoch 7 and is used until epoch 12, oil-first available in epoch 10, and uranium-first available epoch 13.Д®mpire Earth II has technologies to improve each player's civilization. The special resources are available in only some epochs. To collect resources, a citizen (or a band of citizens) is selected, and are directed to a resource. The main resources are available in all epochs and they are food, wood, gold, and stone. There are two kinds of resources: the main resources and special resources. The epochs are the Stone Age, Copper Age, Bronze Age, Iron Age, Dark Ages, Middle Ages, Renaissance, Imperial Age, Enlightenment Age, Industrial Age, Modern Age, Atomic Age, Digital Age, Genetic Age, Synthetic Age.Д«efore buildings and units can be made or created, resources must be gathered. Some of the epochs in Empire Earth II are identical to their counterparts in the original Empire Earth-one exception is that Empire Earth II does not allow players to expand their empires into space. As the player advances through the epochs, new and improved units and structures become available. There are 15 epochs in the game, each representing a part of history. There are eight different game modes in skirmish mode, which can also be played in Multiplayer. Unlike campaigns or scenarios, the winning conditions never change. The player can also play against other human players, however, the common EULA clause that each player needs his own copy of the game is actually enforced, even for LAN games. Weather, another new feature, changes over time on the map and affects the look of the map and performance of units and, in the case of airplanes in thunderstorms, hit points.Д«esides campaigns and special scenarios, there is also a skirmish mode where the player can play against a computer player. The crown system grants strategic bonuses to players who are first to master an epoch's military, economic, or imperial paths at the cost of losing a faster age progression. The War Planner is another new addition, which is a map of the game that the player can display and use to coordinate attacks with allies. The Citizen Manager can be configured to tell a citizen what to do if they have no set task, and the Diplomacy System allows the player to make tributes and manage alliances and wars with other players. Empire Earth II has several new gameplay features from the original gameplay of Empire Earth, such as the Picture-in-Picture window, a small window within the game interface which allows the player to control activities such as unit and building construction.

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