Pipelayer

Pipelayer is a game played with two grids of dots that are slightly offset from one another. The long dimension should be one longer than the short dimension.

The players take turns moving by connecting two dots. A player can only connect dots that are adjacent horizontally or vertically and also only dots of his own color. No move may draw across another move. To win a player must make a continuous connection from one side of the board to the other in the long direction for his color of dots.

An animated example is available on the game's website.