Tangram Duett (1986)

"Tangram Duett is a competitive game of tangrams, utilizing fifty puzzle cards and up to 4 sets of tans, each including two big triangles, one mid-size triangle, two small triangles, a parallelogram and a small square, all of which can be assembled in a square. A scoring system is provided based on the difficulty of each puzzle card, to allow for matches or tournaments to be played. This is not to be confused with Tangoes, which comes in a case of patented design and has a different selection of puzzle cards and rules. "