Engaging Science hosts several excellent interactive games, including ones on sound, space, and wetlands. They’re great for English Language Learners since the text is simple, audio support is provided, and the graphics are good.
I’ve placed the link on my Science page above the Planets and Space section. Please don’t confuse this Science page, which is for English Language Learners, with my other Science page, which is for native English speakers. One of these days I’ll make the differences clearer, and get around to categorizing the links….