Click a unit to select it, then click (or right-click) a tile to move or an enemy to attack. Settle cities with Settlers (B), choose what each city builds, and pick research (T). Attack with several units at once: every friendly unit around a target adds flanking strength, and artillery tears down city walls. Win by capturing every original capital, completing the space program, or having the highest score when time runs out. The game saves itself every turn.

Long-term planning and history: balance growth, science and defence, and see how technologies built on each other through the ages.