An eighteen-piece pro-tangram tiling game is composed of a board and eighteen pieces of various shapes tangrams while each piece of tangrams constituted by a plurality of isosceles right triangles. The board has a square surface whose length of each side is 6 times of that of one side of the above-mentioned isosceles right triangles. These eighteen pieces of tangrams are named after its shapes, such as A-shaped piece, B-shaped piece, C-shaped piece, D-shaped piece, F-shaped piece, G-shaped piece, H-shaped piece, I-shaped piece, J-shaped piece, K-shaped piece, M-shaped piece, Q-shaped piece, R-shaped piece, S-shaped piece, V-shaped piece, W-shaped piece, X-shaped piece, Z-shaped piece for the sake of easy memorizing solutions of puzzles. By the combination of the eighteen pieces of puzzles on the board, different shapes are formed with various kinds of solutions that are great fun and good for thinking.
日本 JAPAN 経済産業省特許庁 登録実用新案第３０７７９３１号
特許・実用新案を検索する １８コマ知恵パズル (2001/03/14)
德國 GERMANY Deutsches Patent und Markenamt 200 20 235.9 (2001/03/22)
中华人民共和国 CHINA 国家知识产权局 十八益智拼盘 ZL 00 2 52105.9 (2001/10/31)