Where are the grammar notes under class?? I feel like I'm missing something. Are they available for mobile version?
In the class Adj. 3, which covers comparatives and superlatives: https://www.duolingo.com/skill/dn/Comparative-and-Superlative
Those are only visible in the desktop version.
"DE TRAPPEN VAN VERGELIJKING
The "steps of comparison", as they are referred to in Dutch, are used to turn an adjective (good) into a comparative (better) or a superlative (best). These are formed by adding suffixes to the adjective, much like in English. This process is mostly regular, with a few important exceptions. (...)
Ok, thank you for your answer. But still, I can't understand this combination, "het zwaarste" with an "e" in the end. I thought the combination would be "het zwaarst"...
It's a specific situation where the gender is not considered. Reread the grammar notes under the class, it will explain you that.