"I did not change anything."

Translation: Nie zmieniłem niczego.

[LestonBuell]

It didn't accept "Niczego nie zmieniłem." Would that also be correct?

[Jellei]

Yes. Good for a situation when someone accuses you of changing some settings. I'm gonna report it.

[Stewart288923]

Yes, I put niczego first and had it rejected. I had assumed an accusation.

[Hot-Doggy]

I can't understand the comments made. "Niczego nie zmieniłem" is NOT capable of being selected, simply because the option to select it does not exist!! Am I missing something, or was the option to select "Niczego nie zmieniłem" previously available?

[Jellei]

I guess LestonBuell just tried putting this answer typing on a keyboard.

[MarjanvanK]

I wrote : < nic nie zmieniłem > and they accept it. So, when you put it in front , the genitive is not necessary ????

[alik1989]

The case distinction between nic and niczego applies only after prepositions. As direct objects they are both (almost) interchangeable genitive forms.