Put your brain to the test with a brand a new sudoku puzzle here on Stylist every day. Welcome to Stylist’s daily sudoku challenge: the game that promotes critical thinking and problem solving.

But even the most dedicated Sudoku-solver might have never spotted this secret pattern. Mathematicians have uncovered a powerful pattern known as the 'Phistomefel Ring' - and it's hidden in every ...

Play our daily hard sudoku here. Plus, you can let us know what you think of the puzzles by emailing at [email protected]. We look forward to hearing from you.