Your free brain training begins here.  Choose from among popular online sources for brain exercises, mind games, teasers and more.

NeuroNation

"The Free Brain Training Community."  No sign-up necessary.

They offer simple and enjoyable brain exercises at no cost.  For a more personalized experience you can create an account (the process is quick and easy) and no credit card is required - just your email.  

A few of my favorite categories are:

• Language
• Logic
• Memory

Brain Pages

"Your One Stop Destination For All Things Brain"

The site purports to get 1.5 million site visitors annually; definitely worth checking out.

My favorites:

• Word scrambles designed by the site's creator, Erin Matlock
• Brain Games
• Optical Illusions

Scientific Psychic

"Puzzles and brain teasers to expand your mind"

The nav bar offers options for puzzles, fitness, illusions, etc.  You can spend hours on the puzzles which, definitley my favorite on the site.