Simple machines game Students control a small robot. They must use some basic machines to reach their objectives. They select the simple machine and see how much force is used to accomplish their goal as well. If you use to much force, robot gets tired and falls asleep.
Science Voc Hangman Select the area that you have covered. Word will be generated from those categories.
Sheppards Software Games (All Ages): This site provides a wealth of free games, puzzles, quizzes, and more. An impressive, rich resource of fun educational games and activities. No registration required. I have to say that I personally enjoyed this site quite a bit, partaking in quizzes, completing puzzles, and checking out the many resources there.
Sciencekids games by topic (scroll down the page past the ads)
CrickWeb- science interactive sites for various science topics