For the basics, I have had a lot of fun playing with the online circuit simulator at everycircuit.com. I just received an email from them yesterday that they ha

For the basics, I have had a lot of fun playing with the online circuit simulator at everycircuit.com. I just received an email from them yesterday that they have an Android game Circuit Jam for electronics puzzles. I haven't tried it so I can't yet comment on how good it is, but I intend to check it out with my kids.