If I was only interested in the Wario content I wouldn't have played the DS game and the Wario challenges having to be unlocked is pretty obvious, with them being remix stages
No, what I meant was what you have to do to unlock them is extremely difficult. You might be setting yourself up for disappointment and putting your sanity on the line.
Alright then. I'm surprised enough that I made it to the hard section of the challenges myself. And yes, they're called "Wario...Where?", not RhythmWare. (Not there yet, but I heard it from someone who did make it there)