I really like to have a challenge for myself and feel it helps me to keep sharp. I have been going to this site http://www.freerice.com/ for several years and it donates rice to United Nations World Food Program. It is a game where you select from several topics and then select the correct answer to a question. When you are right, rice is donated, when wrong, well, you try again!
It is for real, there is no gimmicks. There is, however, a small notice: WARNING: This game may make you smarter. It may improve your speaking, writing, thinking, grades, job performance... and, they are not kidding! I was thinking about simple algebra and could not remember if you . . . well, I could not remember simple algebra.
There are many subjects. You can improve your vocabulary because it asks about a word, and if you get it right, then on to the next word. If you get it wrong, it tells you what the right answer is and about 6 or 7 words later, it comes up again. Aha! It makes you remember!
It is a good cause - give it a try, you might get addicted.
Pat, The Avid Embroiderer
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