I would say that, at least in Pure Mathematics, the most challenging field in the past few years it's a sort of mathematical grand unification project, that goes by the name of "Langlands Program"; this has generated a fair amount of Fields medals in recent years, and aims to unify Number Theory, Algebraic Geometry, Arithmetic Geometry, Group Representations and a few more subjects under a common framework.
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more difficult, most difficult
More difficult and most difficult. With a word that long we don't generally add the -er or -est suffixes.
For the word "difficult, the comparative is more difficult and the superlative is most difficult
Answer this question…Before he proposed his heliocentric theory, most Europeans believed that the sun revolved around Earth.
comparative - more difficult superlative - most difficult