What are you talking about? I don't even use Metal Mario, nor the Red Monster wheels or Dasher kart. What kind of expert is that?
Finding the ghosts in Luigi's Mansion 2 multiplayer is just luck of the draw that they appear.
Actually, NOPE! I checked the chart in Tri Force Heroes and there are 6 challenges left for me. All in world 8. By that time the game was about dead and it was tough to find someone competent enough to complete those. Or just someone not a troll. I also don't yet have the costume for completing the challenge gauntlet, the name of which escapes me at this time. It was added in a later update and the online community died quickly, so once again I couldn't find people patient enough to complete it. I also had just 26 single player medals, I gave it a good try but felt it was too boring.
I don't think completing a game is enough to make one an expert.
I s'pose I should probably just accept it as a compliment, hee hee. But sometimes I wonder if you've seen a real expert, then you'd see just how n00by I am at games.