Game for
Science

I love this website!
It's a virtual world of online gaming, where you can explore
virtual islands with loads of games to choose from. You can control
a single-celled whale through the power of farts, rescue a missing
Whippersnapper Brother or lead the mission to rebuild the island of
Sayansi.
Flash Bang
Science

Packed with games and quizzes, Flash Bang Science is an action
packed introduction to science. Parts of the site are still under
construction, but it promises lots of new exciting games soon.
Zoom

Explore a virtual kitchen and carry out online experiments to
solve a puzzle and get a reward. Then, get out of the virtual world
into the real kitchen. Perform real life experiments and submit
your findings to get a reward!
Khan Academy

Stuck on your homework? The Khan Academy might be able to help.
With 2,600 free videos covering everything from algebra to
astronomy, it's a library of information at your fingertips.