These days, we can do just about anything online. Work, catch up with friends, buy gifts and household items, read the news and play games. Playing games may sound frivolous, but one study found that video games may help maintain brain health in seniors.

Not into video games? You can still challenge your brain online with countless websites featuring brain teasers, logic puzzles and riddles. Here are five of our favorites:

• Puzzles.com http://www.puzzles.com

• Brain Games (National Geographic) http://braingames.nationalgeographic.com/episode/20/

• AARP http://www.aarp.org/health/brain-health/brain_games.html

• Sharp Brains http://sharpbrains.com/brainteasers/brain-games-and-teasers-top-50/

• Forbes http://www.forbes.com/sites/work-in-progress/2012/05/15/10-brainteasers-to-test-your-mental-sharpness/

Do you have a favorite website for challenging your brain? Share it in the comments!