How to play Sudoku 2x3

There is really only one rule:

• Fill in the grid so that
• every row,
• every column, and
• every 2 x 3 box
• contains the digits 1 through 6.

What is Sudoku: rules, history and terminology

This Puzzlue Address: http://sudoku.oubk.com/puzzles/4319181225.html to a friend to play together