Mind Games Host Jordan Schwartz bring you this site that contains psychology mind games and puzzles. These are not terribly complex and don't take a lot of time. Middle schoolers should find them interesting. Mr. J's Real Math Page Mr J is Jack Julian, a physics and math teacher at a rural junior and senior high school in Pennsylvania. These fun interactive math puzzles allow students to submit their answers online and find out if they are right.
Difficulty levels range from easy to medium to hard.
Online hints are provided. This site contains a number of interesting puzzles. I had to get the answers on the first try in order to understand the rules for some of the puzzle types, but after that I found this site to be fun. The puzzles are updated weekly. The puzzle page contains several puzzles of varying difficulty, most can be done by middle schoolers.