LCD display and shape of machine,itis easy portable for anywhere what you want to take,such asoffice,travel,home,when you are boring .
machine inner battery:2*Ro3p 1212 UM1.5V (2x AAA battery included)
Sudoku doesn't require any special math skills or calculations. It is a simple and fun game of logic -- all that's needed is brains and concentration.
There is really only one rule to Sudoku: Fill in the game board so that the numbers 1 through 9 occur exactly once in each row, column, and 3x3 box. The numbers can appear in any order and diagonals are not considered. Your initial game board will consist of several numbers that are already placed. Those numbers cannot be changed. Your goal is to fill in the empty squares following the simple rule above.