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.
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