Editing Tigris and Euphrates (section)

==Gameplay==
The game can be played by two, three, or four people. Play offers both [[military tactics|tactical]] and [[strategy|strategic]] objectives. As with many games, short-term objectives gain prominence when more players participate, as players have fewer chances to follow up on previous moves. Luck plays a role, as players draw [[Tile-based game|tiles]] from a bag, but it is seldom decisive. Players may selectively discard and redraw their tiles at the cost of one "action point", of which each player has two per turn. The game does not use [[dice]].

The board is a map of the two rivers, marked with a square grid.  There are four types of tiles with corresponding leaders: temples and priests (red), farms and farmers (blue), markets and merchants (green), and settlements and kings (black). The game starts with ten isolated temple tiles already placed on the board. Players play tiles and leaders onto the board, creating and expanding regions and kingdoms.  Monuments may be built on the board when four tiles of the same color are played into a square pattern.

Two leaders of the same type cannot coexist in the same kingdom.  Internal conflicts are caused by players adding a second leader of a type to a kingdom.  External conflicts are caused by players playing tiles to merge two existing kingdoms.

During the game, players [[Score (game)|collect points]] in each of the four colors as a result of playing tiles, resolving conflicts and controlling monuments. After the final round each player sorts his or her points by color, including any "treasures" which they have acquired, which count as any color the player wishes. In order to limit specialization the player with the most points in their weakest category wins.

For example:
*Alice has 6 black, 8 red, 12 green, and 12 blue points; thus has a score of 6.
*Bob has 9 black, 10 red, 7 green, and 15 blue points; thus has a score of 7.
*Charlie has 14 black, 14 red, 5 green, and 20 blue points; thus has a score of 5.

Players must balance their scoring and avoid overspecializing.  Knizia later used this mechanism as the basis for [[Ingenious (board game)|Ingenious]].