Go!games Mega Book of Sudoku: 365 Brain Puzzlers

Start off easy, with medium-level Sudoku, move on to the harder grids, and finally try your luck with the tear-your-hair-out very, very HARD conundrums. Even though you're filling in the boxes with numbers, there's no math skill required
just pure logic. The introduction provides basic strategies, explaining how to exclude possibilities and leading you through a sample puzzle in great detail. By the time you've made it through this collection, you'll have sharpened that gray matter and built those mental muscles.

Supercharge your brain and get yourself a year's worth of entertainment at a great price