Crossword puzzle clue "minnesota's state fish and a hint to all 12 border answers in this puzzle"

Minnesota's state fish, and a hint to all 12 border answers in this puzzle

Border area, which contains a hint to solving this puzzle's 12 border answers

Landmark that, in a way, is a border feature of this puzzle and a hint to what's missing from 10 answers

Home theater feature, and a hint to this puzzle's 10 border answers

Classic letter puzzle -- or, when parsed differently, a hint to three Down answers in this puzzle

Illinois, Indiana, Iowa, Michigan, Michigan State, Minnesota, Northwestern, Ohio State, Penn State, Purdue and Wisconsin

Went all out on stage ... or a hint to the four other longest puzzle answers

Mexicali and Calexico, and a hint to this puzzle's perimeter answers