Exercise Your Brain! Just like your body, your mind needs a regular workout as well. Think about why we do weights at the gym; we work muscles that are not active during our day-to-day lives. Similarly, challenging your brain with mental activities keeps you sharp.
Learn more about "What is Brain Fitness" and "Criteria for Effective Brain Fitness Activities"
Sudoku: Test yourself at different levels.
Word Riddles: See how many riddles you can solve.