A research that is not yet available is indicated by a grey circle around the icon.Once the circle is full, the research is completed. A research in progress has its circle filling up in blue.You can even upgrade lower level units on the map to the highest completed level. When you produce new units of this type, they will automatically spawn with the highest completed research level. Completed research projects are indicated by a blue circle around the icon. Tap on it to open the research info screen, where you can also start researching it.
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