I saw this on Pinterest months ago: giving your kids broken toys and a screwdriver. We had a garage sale a bit ago, and we cleaned out the house for old toys and nonworking. I tried putting new batteries in this ABC game, and nothing. I declared it toast, and gave it to Ty and Za to "fix." They were thrilled.
Ty really thought he could fix it. He was very methodical in taking it apart, and separated the pieces.
He tried to reassemble, but never could figure out why the toy stopped working. I couldn't either - nothing was too obvious.
They spent the large part of an afternoon working on it and then threw it in the trash. It was broken, so I consider this a free project!
Note: I suggest spreading a tarp or old blanket down for the kids to work on. We spent lots of time finding tiny screws and pieces of plastic.