One Hundred Problems in Elementary Mathematics (Dover Math Games & Puzzles)

Paradoxes in Mathematics (Dover Math Games & Puzzles)

Challenging Math Problems (Dover Math Games & Puzzles)

Kakuro for Beginners (Dover Math Games & Puzzles)

Mathematics, Magic and Mystery (Dover Math Games & Puzzles)

The Bogotá Puzzles (Dover Math Games & Puzzles)

Riddles in Mathematics: A Book of Paradoxes (Dover Math Games & Puzzles)

Upper Elementary Grammar Games Grades 3-5: Grammar Games, Puzzles, Mazes