Twelve Men's Morris

How to play

A larger cousin of Nine Men's Morris, adding four diagonal lines that join the board's outer corners and giving each side twelve pieces instead of nine. Place your pieces first, then slide them along the drawn lines — line up three in a row, on any line including the new diagonals, to form a mill and remove one of the AI's pieces.

Rules

  • Placing phase: tap any empty point to place one of your 12 pieces there.
  • Once all pieces are placed, tap one of your pieces then a highlighted adjacent point to slide it along a line.
  • Forming a mill — three of your pieces in a row along any drawn line — lets you remove one AI piece that isn't itself part of a mill (unless every AI piece is in one).
  • When you're down to exactly 3 pieces, you may "fly" to any empty point instead of just an adjacent one. Grind the AI down to 2 pieces, or leave it with no legal move, to win.

Tips

The diagonals make the four outer corners the strongest points on the board — each one sits on both a square side and a diagonal, so it can belong to more mills than any other point. Grab corners early, and watch for AI double-mill threats where one slide would close two mills at once.