The 30-Minute Brain Workout . Difficult Crossword Puzzle Books (with 50 puzzles to solve.) 12+

📒 You don't have to solve each puzzle in 30 minutes but at least spend that time daily working on some clues. As you practice, you will absorb new knowledge that might help you later on. Frequent exposure to these puzzles will also result to the birth of strategies that can be applied to make the task easier to do. Give it a try. Do crossword puzzles today!