You can make a mill by placing
three pieces
of your own color in a row along a vertical or horizontal straight line (three pieces along a diagonal line does not count as a mill).

There are two ways to win:
Reduce the number
of your opponents pieces to two
Block all of your opponents pieces
so your opponent cannot move.
The game is
automatically drawn
, if the number of pieces does not change for 50 - 2x25 – moves.
When a player makes a mill, that player can
remove any opponents piece
that is not in a mill (if every piece is in a mill, then any of them can be removed).
To begin, tap any empty spot on the board to
place one of your pieces
. On each turn, try to form a mill by
lining up three of your pieces
horizontally or vertically, or prevent your opponent from doing the same. Whenever you form a mill, you may capture
one of your opponent’s pieces
by tapping it. You cannot capture a piece that is already part of a mill unless no other pieces are available. The placing phase continues until both players have placed all nine of their pieces. Until then, pieces cannot be moved.
After all nine pieces have been placed on the board, you must
move one of your pieces
to an empty adjacent spot. Try to make a mill and/or prevent your opponent from moving pieces. When a player is reduced to three pieces, that player can
jump a piece
to any open spot on the board.
Common Nine men's Morris as described above (this is the default setting).
There are
10 pieces
for each player, which can be moved right from the start.
There are
12 pieces
for each player, and
diagonals are added
to the board.

You can change your preferred variant in the "Chat and game settings" dialog of the game.