[harimau777]

In my experience, the 50% most difficult part of a problem is often the most boring. E.g. writing tests, tracking down obscure bugs, trying to understand API or library documentation, etc. It's often stuff that is very difficult but doesn't take all that much creativity.

[JimDabell]

I disagree with all of those. Tracking down obscure bugs is interesting, and all the other examples are easy.