The world's 200 hardest brain teasers : mind-boggling puzzles, problems, and curious questions to sharpen your brain /
The world's 200 hardest brain teasers : mind-boggling puzzles, problems, and curious questions to sharpen your brain / The world's two hundred hardest brain teasers : mind-boggling puzzles, problems, and curious questions to sharpen your brain / - xiv, 188 pages : illustration ; 20 cm
9789833832170 (paperback)
Logic puzzles.
Logic puzzles.
Word games
GV1493 / G38