You might not be able to do these!

Take the Sudoku challenge if you dare! Featuring five levels of difficulty, from very easy to very hard, these beautifully and logically constructed grids offer solvers just the right amount of difficulty, allowing them to stay focused and fully enjoy the experience. The creators, Sudoku master Anthony Immanuvel and puzzle guru Terry Stickels, know that if a puzzle becomes too stressful or frustrating, it's probably a flaw in the design—not the person doing it. Unlike lesser puzzles, these never have more than one possible answer, are pleasing to the eye, and involve no guesswork. They're a great way to keep the mind in tip-top shape! See if you can win this challenge match!

What they’re saying about Terry!

"Terry Stickels’ puzzles are perfect brain stimulators for young and old alike. They're fresh, varied, and well thought-out and they build problem-solving skills that are useful both academically and in everyday life." —Will Shortz, Crossword Editor, the New York Times

"Terry Stickels has joined the ranks of top popularizers of mathematical problems. His puzzle collections are highly recommended for their novel approaches and fresh ideas." —Martin Gardner,
Writer and Past Editor of Scientific American's Recreational Mathematics Column

"Terry Stickels is one of the most gifted puzzle writers, authors, and speakers it has been my pleasure to know. He has generously provided us with his time and talents in creating unique and challenging material, for our MENSA projects.” —Jim Blackmore, National Marketing Director, MENSA

Terry Stickels is well-known for his three internationally syndicated columns. FRAME GAMES, seen in USA WEEKEND magazine, is read by over 48,000,000 people in 600 newspapers weekly. He concurrently writes STICKELERS for King Features, appearing in over 200 newspapers daily, including the Washington Post, the Chicago Sun–Times, the Denver Post, and the Toronto Star. He also is the featured puzzle columnist for the Guardian, London’s largest newspaper. In addition, Terry finds time to write books for both adults and children, and do motivational speaking.