The answer to this meta are the 4 letters that go in the black boxes to make valid words. Letters in the solution are ordered left to right, top to bottom.* They are all 5-letter words, and none are the letter S.
A Boggle word is a word that starts on any cell, continues in any of 8 cardinal directions, does not skip over any cells, and does not revisit any cells. The cells then, in that order, form a word.
The answer to this meta are the 4 letters that go in the black boxes to make valid words. Letters in the solution are ordered left to right, top to bottom.* They are all simple 5-letter words.