I think this is Begonia 'Tiger Kitten'

Can you confirm? Thanks!

Looks Tiger Kittenish to me. =º)

Thanks again, Lali!

Are the humidity requirements for this one the same as 'Soli Mutata'?

GH

My experience is that soli mutata wants more humidity than TK. But I live in a very hot dry area so your situation might be different.
soli mutata is high maintenance for me, TK is easy as pie.

Hey GH,

There are so many bowerae hybrids that it makes it hard to differentiate one from another. 'Tiger Kitten', 'Wee Paws', 'Tiger Paws', 'Robert Schatzer', and others look very similar.

If you grow it in a terrarium, the leaves will probably double in size and turn a darker, more solid color. It will grow like the proverbial weed in this environment, but then so do a lot of begonias. The downside of this is it becomes more susceptible to mildew and will resent being moved back out to "normal" air.