Surround!

Surround! is played on any kind of grid; six example grids are provided including standard square, hexagonal, and triangular grids. On a turn a player colors in one grid space. The object is to completely surround any connected group of spaces of the opposing color (including just a single space) with your own spaces and/or the edge of the grid. Spaces do not connect at the corners. The game is stated to be intended as an introduction to Go.