Anchor

Anchor is played on a hexagonally tessellated, three dimensional surface. A filled board always produces exactly one winner. Anchor 2D is a variation of Anchor. The rules for the 3D version are exactly the same as for the 2D version. The 2D board and the 3D board are isomorphic. If you take one of the three holes in the 3D board and stretch it outward, the hole's perimeter becomes the perimeter of the 2D board. Going the other way, if you cinch the perimeter of the 2D board, the board perimeter becomes the perimeter of a hole in the 3D board.