Appendix SQUARE: Identifying brethren of Colored Squares
If there are 4 of the 5 colors (Red, Yellow, Blue, Green, and Magenta) occurring exactly four times each with exactly 1 color missing:
If one color occurs fewer times than any other (no tie), and upon a successful press, the pressed button turns white:
If there are colors besides Red, Blue, Green, Yellow, and Magenta, and there are no duplicate colors:
If one color occurs fewer times than any other (no tie), and upon a successful press, the pressed button turns black: