From the game developer website: "Killer Snails creates games that inspire a love of science. The mission of Killer Snails is to create the next generation of changemakers and to bring science out of the laboratory and into the hands of learners globally. "
Not free to play, but game prices vary from 1.99 to 24.99 and are designed to teach children about science. Some of the games are digital, and others are card games that you order for use.