"Of course, jumping straight to a full sized Sudoku grid of 9x9, filled with the numbers 1 to 9 (nine times each) is going to be a daunting prospect (but one that some will appreciate). Rotoku will start you off with an easier level made up of a 4x4 grid, with the numbers 1 to 4 in the grid. Easier, of course, being a relative term, but this is a good size, providing a challenge for beginners and leaving you time to work on moves and sequences that will be of benefit when you move up to larger grids, working towards the ultimate challenge of the 9x9."
