My love of electronics and computers, which defined my career, can be traceback partially to having a electronic building block toy when I was very young. Back then, we do not have Snap Circuits. The toy/kit that I had was more powerful and less user friendly. You can only buy that kit as a specialty item in Japan now. It is part of the Otona No Kagaku series, meaning "science for adults". There is a website that you maybe able to order one. Mine is the old version of the EX-150. A similar Germany version is still available at Lectron Electronics.
Anyway, back to the easy way -- Snap Circuits. When I looked at the pictures I never thought it was any good. It definitely is on the simple side on the electronic circuits that it builds. I gave one of these as a Christmas present to someone and I got a chance to play with it. I was surprised that it was a pretty good kit. Very easy to "use". So it is well suitable for younger kids, as an introduction to basic circuits. You can find the manuals online to check out the kids.