Sudoku Free from genina.com is a great game to be played on your Android Phone. Simple minimalistic design, a clean interface and many many options, make it such a craze, that you will never look for a paper puzzle again.
It has 4 difficulty levels and the ability to carry on from where you were interrupted. So, if you get a phone call in between and you have to exit the game, when you get back, you will be sure to find the puzzle exactly where you left it.
With Auto-save, Undo and Redo, Pencil marks, online competitions and much more, this is a game which can engross you for hours of fun ! Enjoy while you travel or when you are idling !