Exercise your brain with 399 Games, Puzzles, & Trivia Challenges Specially Designed to Keep Your Brain Young! With the right program, you can keep your brain young, strong, agile, and adaptable. Organized on an increasing scale of difficulty from "Warm-up" to "Merciless," this book features 399 brain teasers and more that are fun and engaging to play and are expertly designed to give your brain a workout that stimulates neurogenesis, the process of rejuvenating the brain by growing new brain cells. Targets 6 key cognitive functions: 1. Long-term memory, 2. Working memory, 3. Executive functioning, 4. Attention to detail, 5. Multitasking, and 6. Processing speed.