The colors are present to create individual regions. In each region all the letters are the same. Two adjacent regions have different letters; non-adjacent regions may or may not have the same letter regardless of same or different color.
Clues for the words in the four middle rows (rows 2-5), in random order, are:
- hot dog topping
- VCR's "go back to start" button
- language of Warsaw
From Mensa Puzzle Calendar 2019 by Fraser Simpson, Workman Publishing, New York. Puzzle for June 14.