200 Kakuro (or Cross Sums) puzzles, ranging in size and difficulty from easy 3x3 puzzles to monster 29x37 puzzles. Comes with answers and solving tips.

Two cavemen invent EVERYTHING! But will they be happy? Inch and Grub are cavemen. Grub's cave is bigger, and he says that makes him the best. So Inch adds a wat

The phenomenal New York Times bestseller that “explores the upstairs-downstairs goings-on of a posh Parisian apartment building” (Publishers Weekly). In an

This book is brimming with memory, word and number workouts, codes, battleships and mind-bending spot the differences, as well as Japanese puzzles including han

Cryptograms are substitution codes: every letter in the code is replaced by another. Some hints: Start with the shortest words. Break down long words into prefi