There are over 100 free science games for kids at PBSkids.org. This massive online library of interactive games includes "Build-A-Bot", which teaches rudimentary engineering skills and "How to be an Inventor", a fun exercise showing children how curiosity leads to innovation. These games are perfect for kids ages 3-8.
Sid the Science Kid, Curious George and Oscar the Grouch are among several favorite PBS characters teaching kids basic science skills in these wonderful free games. Other games include "Robot Rover", "I Want to be a Scientist", "Inventor's Workshop", "Chickens in Space", and "Super Duper Antibodies." Kids will have a blast as they learn the building blocks necessary for future scientific endeavors.