Well, that's the title for Wario Land 4 in Japan. So out of boredom's sake, which one do you prefer? Wario Land 4, as it's called in the rest of the world, or Wario Land Advance as it's known in Japan?
I'm English and I grew up English and I grew up with English Wario, so I like the title 'Wario land 4", it's easier just to say "I'm gonna play some Wario 4 " than "I'm gonna play some Wario Advanced."
Now that I think about it, not very many games that are the fourth installment in it's series tend to go by "4". Super Mario World and Donkey Kong 64 are good examples.