Nine Men's Morris Online — Mill: Fortress Siege 7+

A knight faces cartoon monsters with his shield, keeping a child safe behind him

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Nine men's morris — also called Mill, Merrills or Merels — is one of the oldest strategy games on Earth: boards are carved into Roman rooftops and medieval cathedral seats. Each player has nine pieces; three in a row along a line is a mill, and every mill lets you remove an enemy piece.

Here the board is a ring of fortress walls: steel knights against a tusked orc horde. Warriors march onto the posts, a mill flashes and an attack is called, and the last army standing holds the fortress.

Three phases teach three different skills: placing (build threats), moving (open and close a mill — the 'running mill' trick), and flying with three pieces left (jump anywhere). No dice, no luck.

How to play

Tap a free post to place a warrior; once all nine are down, tap a warrior and then a linked post to move. Form three in a line — targets light up, pick which enemy to remove. Pieces inside an enemy mill are protected while others remain.

Voiced rules on the live board, a ladder of rivals that get stronger, and the choice of side: knights move first, the horde enters from the far wall.

What your child learns

Mill is a planning game in three acts. Children learn to build a double threat (two lines that share a post), to time a mill so it can open and close every other move, and to count pieces — when a rival drops to three, everything changes. It is chess-style thinking without the chess rulebook.

The science behind the games

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FAQ

What is a mill?

Three of your warriors in a straight line along the walls. Every new mill lets you remove one enemy warrior — that is how the game is won.

Why can't I take that piece?

Warriors standing in an enemy mill are protected as long as the enemy has other warriors outside a mill. The rule is voiced when it happens.

What happens with three pieces left?

A player down to three warriors may 'fly' — move to any free post. It is the last-chance rule of the classic game, and the tutorial shows it.

Is it luck or skill?

Pure skill: everything is visible, and the better plan wins.

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By Evgeny Arsentiev, PhD · Last updated: September 2026