Harmony

Each player takes a set of 21 hexagon-shaped tiles with either black or white centers. Every tile has colored hexsides, two sides each of blue, red, and yellow. Players alternate playing tiles, matching colored hexsides. After the first two turns, each tile must be played to match two or more hexsides. The winner is the first player to either complete a straight line of 5 of his own pieces or fully enclose any one or more opponent pieces inside 6 or more of his own pieces. - BoardGameGeek