If problem-solving is how you wish to spend your day or if Olympiads & quizzes are what make you feel wonderful & happy then start off with Chat Arrowords. If you are a teacher in a primary school & are looking for puzzles that will test your class & keep them busy look up for some ideas. These are language puzzles that can help with vocabulary as well as cognition exercises. You can subscribe to Chat Arrowords magazine & get a taste of high quality puzzles & activities that challenge your thinking power. There are also prizes & competitions where cash gifts can be won so while it might require sustained amounts of working on the end result of satisfaction & (probably) prize money are fantastic incentives to keep your child on his toes.