Topologik

Abstract game based on mathematical principles of topology.
Two players (or two teams) place pawns and try to form an unbroken chain, connecting the three coloured sides of the board.

One game of the Heyne series published in the mid 70s.

Rough translation from the back of the box:

Topologik is a game for two or four persons. It promotes planning and understanding of the opponents' strategy. The players set out posts on the playing field, that the develop into a unbroken chain. One of them must connect together the colored edges of the play area.