What determines Roman Numeral sequel-counting?

[Aladuf]

hmm Turok II or Turok 2?

So, this is why you're heading to the office today?!

[Dyne]

No, not at Propaganda yet. Just website stuff for now.

And it spurred when I saw "Ninja Gaiden II", actually. Seriously, do they think Ninja Gaiden is mature?

[Typhoid]

Using a numbers usually only caters to little kids games - because they won't really know how to read numerals.

Who knows.