The Times Samurai Su Doku 6: 100 Extreme Puzzles For The Fearless Sudoku WarriorThe Times Mind Games $14.95
The Fabulous Budapest Gambit New And Updated Edition: Much More Than Just A Sharp Surprise WeaponMoskalenko, Viktor $29.95
Can You Solve My Problems?: Ingenious, Perplexing, And Totally Satisfying Math And Logic PuzzlesBellos, Alex $15.95