Tigris & Euphrates

Standard setup and turns: use the gold-bordered board with ten temple-and-treasure spaces. Each player has six hand tiles and two catastrophes. Take up to two actions per turn, repeating if desired: position or withdraw a leader, place a civilization tile, play a catastrophe, or replace up to six hand tiles. At turn end affected players refill to six. Connections use shared edges, not diagonals.

Placement: leaders require an empty non-river space adjacent to a temple and cannot unite kingdoms. A leader losing its last adjacent temple is withdrawn. Blue farms go only on rivers; the other colors go only on land. One tile cannot unite more than two kingdoms.

Ordinary scoring: a placed tile gives one point of its color to the owner of the matching leader in its kingdom. If that leader is absent, the black king may collect it instead. No placement point is awarded without an eligible leader, outside a kingdom, or for the tile joining two kingdoms.

Internal revolt: placing a leader into a kingdom containing another of the same color starts a revolt. Count only red temples adjacent to each competing leader. The attacker, then defender, may each commit red hand tiles once. Higher strength wins; ties favor the defender. Withdraw the losing leader, award the winner exactly one red point, and remove committed hand tiles from the game.

External war: joining kingdoms containing matching leaders creates wars in those colors. Count connected matching tiles on each leader’s original side, then let attacker and defender each commit matching hand tiles once, in that order; ties favor the defender. Remove the losing leader and that side’s matching supporters, awarding one matching point per leader or tile actually removed, never for committed hand tiles. In red wars protect temples holding treasure or adjacent to other-colored leaders. The active player chooses conflict order; a split kingdom can cancel later wars.

Monuments: when your tile completes a same-color 2×2 square, you may immediately flip the four tiles and build an available monument containing that color, after resolving any war. Facedown tiles still connect the kingdom but no longer support conflicts or count as temples. At your turn end each of your matching leaders scores one point per matching monument in its kingdom. A king cannot substitute for other colors here.

Treasure and catastrophe: if a kingdom has multiple treasures at action end, its green trader takes all but one, prioritizing special-border spaces. Without a trader they stay. Each treasure becomes one point of any chosen color at game end. Catastrophes permanently block connections and may cover ordinary tiles or empty spaces, but never leaders, treasures or monuments.

Ending and victory: end when only one or two treasures remain at turn end, or when a required tile draw cannot be fulfilled because the bag is empty. Allocate treasures, then compare each player’s four color totals from lowest upward. Highest lowest total wins; ties compare the next-lowest totals in turn. Identical totals in all four colors share victory.