What are the best Asynchronous Multiplayer games on Steam?

From the players cities and armies to the lush landscape, Civilization is quite a beautiful game for those with systems powerful enough to push the graphics to the limit. Even when on lower graphical settings the game looks lush and well animated.

It can be pretty difficult to win by diplomacy or culture which does add some challenge to the game but it can get tiresome if one keeps winning by only military or timed victories.

Civ 5 restricts you to having one unit per tile, but has an AI unable to handle that restriction well, and doesn't even have decent pathing for units. Late game becomes a slog of ordering each unit individually due to poor pathing.

You can watch your own games or multiplayer games of other people.

Frozen Synapse has deep tactical possibilities. You have to take into account your environment (there's even destructible terrain), strengths and weaknesses of each squad member, position and viewing angles of every man on the field while developing a coherent plan of action by setting waypoint...

The story in Frozen Synapse is generic sci-fi.

Players can take as long as they want to take a turn which means that there could be days that go by without anyone bothering to take their turn.

From tutorials to challenge levels their are many in game features to easily learn some of the finer intricacies of gameplay.

Being that the multiplayer is asynchronous, users can take their time for their turns as well as take on several matches at once.