Trefl is a quality European Puzzle brand using high quality blue-board for durability and years of enjoyment. Puzzle solving sharpens your creative thinking and problem-solving skills and improves memory. Challenge yourself, family or friends. High Quality Puzzle Blue Board Precision cut interlocking pieces ensure a finished product with a smooth, even surface. Exclusively and proudly produced in Europe since 1985 Trefl creates challenging puzzles for adults and children in cooperation with amazing artists that captivate, educate and inspire