The following nouns take the ending -en everywhere, except the nominative singular in -e and the genitive singular in -ens. Can you find them all?
Source: Wiktionary
Because of their rarity, most exhibit a variation with a more regular declension. They are all of the masculine gender, except for the word for heart, neuter, which doesn't exhibit any ending at the nominative and accusative forms of the singular.
You will be shown 10 random numbers between 1 and 100 without knowing what's next. Your task is to put them in order! But beware, if a number cannot be placed, the quiz ends...