Your brain is a muscle. You need to exercise it regularly.
You can use 'Fun With Puzzles' APP for excercising your mind by solving any kind of puzzles. These puzzles includes Picture Puzzles, Mathematical Puzzles, Logical Brain Teasers, Rebus, Sudoku Puzzles, Brain IQ Tests, English Word Brain Teasers, Kids Puzzles, Odd One Out Puzzles, Visual Puzzles, Observational Puzzles, Mystery Puzzles, Next in the Series Puzzles, Out of Box Thinking Puzzles, Lateral Thinking Puzzles, Interview Puzzles, Missing Number Puzzles, Tough Brain Teasers, Hard Puzzles, Easy Puzzles, Finding the Mistake Puzzles, Spot the Difference Picture Puzzles Hidden Object Puzzles, Riddles, Logical Printable Puzzles, Optical Illusions, Stereograms, Puzzles, Brain Teasers, Visual Brain Teasers, Mind Twisters, Observation Test, IQ Test, Mind Puzzles, Eye Test, Brain Test, Mind Questions, Mind Teasing Puzzles, Brain Twisting Puzzles, Challenge your Mind, Tricky Brain Teasers, Easy Brain Teasers, Kids Brain Teasers, Teens Brain Teasers, Adults Brain Teasers, Find the Difference Puzzles, Find the Different Puzzles, Observation Skill Test, Odd Picture Out, Mind Boosters, Find Odd One Out, Visual Riddles, Questions, Tickle your mind, Feed your brain, River crossing problems, rack your brain, Crack Logic problems: Math problems and puzzles, mental exercises, memory, visual thinking, & trivia games, mind jammers, mind-boggling brain game teaser for all ages, chess Puzzles etc.
It also contains listing of Sudoku and Puzzle Events across the world.
You can learn about solving many of these puzzles types by going through the Puzzle Tutorials.
You can access Puzzle and Brain Teasers related videos and images.
At last you can also enjoy Optical Illusions and Stereo-grams.