Third idea

In my third idea I have designed a puzzle with farm animals.

It is a kind of cube with four square holes.

Inside of that holes you can see an animal´s pics.

Then you have four pieces with the same form of the holes. On top of them you can see a pic with the skin of the animals that are inside the holes.

So, the toy consist in put that pieces in the correct place.

If you do it well, the sound of the animal would sound it! If not... an annoying sound would sound!

All of that would be done on Java.