I've played most of the levels in Super Mario 3D World with Princess Peach and after I've got Rosalina, then with her. If I want to reach the golden stars for the levels, I have to play each level with all five characters: Mario, Luigi, Toad, Princess Peach, Rosalina.

But how can I see which character has already finished that level? Is there some hidden statistic that I haven't found yet? I don't want to waste time by replaying with a redundant character.