One of the best ways to keep your brain active and healthy is to regularly solve puzzles. Puzzles not only keep your mind fit by getting the brain cells working, they're lots of fun too and, as puzzle solvers all over the world have found, they can become very addictive. Aimed especially at people who want to exercise their minds, Keep Your Brain Fit contains hundreds of mind-boggling puzzles of various types. With teasers ranging from lateral thinking problems and spot the differences to sequential puzzles and number quizzes, there's sure to be something to suit everybody and an activity to stimulate each part of the brain, giving your mind a thorough and beneficial workout. But, as with all exercise, it's not good to do too much or you could pull something. We've therefore included all the solutions, so that you don't overdo it if you can't figure out an answer.