How to rotate world vertically...?

[Arisuka]

My mouse is dying, and does weird twitches and random clicks, so while I was building my world when it suddenly started to rotate oddly because of my mouse did something odd..
The world rotated so that I could see the sun and and all, but I can't rotate the view back to the original position because I have no idea how to rotate the world vertically!

In Camera Settings is that 'invert horizontal rotation' and 'invert vertical rotation', but I tried all kinds of stuff with that without better results..

So does anyone have advice how I could rotate the world view vertically, what buttons to hit and what magic words to mumble? :D

[Robodl95]

Well for me if I hold down both mouse buttons at the same time I can rotate the world freeform

[dramamine213]

The pitch that you're talking about, I was able to do what you were talking about by holding down the mouse wheel and moving the mouse. I hope this helps as I haven't figured out how to do it on the keyboard.

[rian90]

I can use Num Lock and then the up and down arrow keys on the right side of my keyboard.