Failed fudge

I wanted to make fudge with the girls. They said it was boring to stand there the whole time stirring. They went out to play and I was trapped in the hot kitchen. Sigh!
When the fudge had cooled only the centre was fudge and the rest was sugary somethingorother. How does that happen? I ate the fudge bit and cut the rest up into block, took it to work and they loved it. All gone in 20 minutes although there was a health warning attached: 99% sugar. No one seemed to care.