Seeking an intellectual challenge, looking to prevent brain fog, or just wanting to try somenew brain games? Test your mind with this challenge: 90 days of logic puzzles that progress from easy to hard. The wide variety of word-based, number-based, and visual logic puzzles means you won't be bored. And with bonus puzzles to keep your good habit going, you'll be amazed at the improvement in your concentration, deduction, and critical thinking skills in just three short months. Six types of logic puzzles, all crafted by an expert. Including logic grid puzzles, sudoku, calcudoku, battleship, kakuro, and masyu. Helpful guidance for each kind of puzzle. Expand your puzzling capabilities and master new logic puzzles with our expert's top tips.