Game 1: place all 16 square to obtain a sum of 34 in all direction: 4 horizontal lines, 4 vertical lines, 2 diagonals. Game 2: classic 15 puzzle The classic game of the 15th and the mathematician game of 16! Dimensions: 4,8 x 4,8 x 1,2 inch Difficulty: MEDIUM 2/6 (16 Puzzle), EXTREME 4/6 (16 Puzzle) Folding wooden box. Pocket travel version in finest teak/samena wood