15 cool and unique puzzles to pass the time and challenge your brain

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• Jigsaw puzzles are the age-old activity that all members of the family can enjoy.
• Here are 15 puzzles that will challenge and entertain you. You'll have a final product that looks good enough to hang up.
• See also: 19 activities to keep you busy when you're stuck at home

Have a few hours to kill? Of the many activities you can do to fill the time, doing a jigsaw puzzle is one of the more nostalgic and analog pastimes.

Not only are they stimulating, but puzzles, particularly those thousand-piece beasts, can be quite challenging or plain frustrating at times. Bill Gates is known to enjoy quality time with a perplexing puzzle. And many studies point to the benefits of puzzle-solving, including better spatial skills, memory retention, and cooperation with others.

So even if your main line of thought is "I'm bored and want to make something that looks nice," know that completing a puzzle is also productive for your brain.

Here are 15 cool and interesting puzzles to complete by yourself or with a partner.Read the original article on Business Insider