,Reebok Easytone

Every day on NYTimes.com you can solve a new sudoku puzzle that matches your level of expertise. Select easy, medium or difficult. For information on how to play, .

MEDIUM

How to Play:

- Fill the grid with numbers so that every row, every column and every 3-by-3 box contains the digits 1 to 9, without repeating.

- Type a number directly into a square or drag it in from the right.

- If you have narrowed down the possible numbers for a box, enter multiple numbers in small type. Hold the Alt key on a PC or the Control key on a Mac while typing the numbers. To remove the number, repeat the step.

Features:

TIMER: Track your time by clicking "Start."

UNDO: Click to re...