Vagabondo (1979)

This game, from the makers of Mastermind, challenges players to place pentomino-style tiles of various sizes and shapes onto a grid in such a way that they always touch pieces of an opposing color but do not touch pieces of their own color. There are different rules for the two-player/four-player partnership game and the three-to-six-player game, allowing for more players than usual for an abstract strategy game to play.