That is a good question. But, lately, I enjoy taking the National Geographic Geo Bee Challenge. Everyday, there are 10 new questions from the National geography bee.
I usually get about 6 questions right. The most I have ever gotten correct is 8 and the least is 3.
If anyone has any online quizzes or thinkng games that they do on a regular basis, post it in the comments. I am interested in adding to my daily challenges.
Here's the address www.nationalgeographic.com/geobee