Mathematical Brain Benders by Barr, Stephen

Tangrams: 330 Puzzles (Dover Recreational Math) - Paperback - GOOD

Mathematical Brain-Benders : Second Miscellany of Puzzles Stephen

Tangrams: 330 Puzzles (Dover Recreational Math) - Paperback - VERY GOOD

My Best Mathematical and Logic Puzzles (Dover Recreational Math) - GOOD

Kakuro for Beginners (Dover Recreational Math) - Paperback - VERY GOOD