Trilogy consists of a square or rectangular grid with figures in some cells: squares, circles, triangles. The goal is to fill in each cell with figures. Three consecutive figures must not be all the same and must not be all different in any row, column or diagonal.
ThriftBooks sells millions of used books at the lowest everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $15. ThriftBooks.com. Read more. Spend less.