I've been playing Starkingdoms (text based web game, google it) for about 12 years. As I said it's text based, so there's no animation what so ever.
Basically you create a kingdom and grow it for the duration of the round (2 months) and compete against other people. You grow your kingdom by exploring/attacking for land, and build an army to defend your land.
People spend hours creating strategies on how to best start their round.
You can read up much more about it on wikipedia or visiting the website.