Logic Masters Deutschland e.V.

“One Fish Two Fish Red Fish Blue Fish” is a children’s book written by Theodor Seuss Geisel, who wrote under the pseudonym “Dr. Seuss.”

THE RULES: Ordinary sudoku rules apply. Place Digits 1 to 9 in each row, column, and 3x3 box.

White kropki dot rule applies. White dots separate consecutive adjacent digits. Not all possible white dots are necessarily shown.

Seussdoku: "One Fish Two Fish Red Fish Blue Fish." Each fish is a line of 5 cells. Digits on the fish lines follow the rules associated with the colors.

Some fish have exhaled colored bubbles. The bubble columns are vertical lines that are extensions of the fish lines and digits in the lines do not repeat in the circle bubbles of the same color.

Purple Renban fish: the cells on the purple fish line contain a set of consecutive digits.

Green Whisper fish: adjacent cells on the green lines and in green bubbles differ by at least 5. For clarity, each green line crosses itself so that r1c8 is adjacent to r2c9 and r2c8 is adjacent to r1c9.

Whisper fish are clones. Green fish contain the same 5 digits in the same position in relation to each other.

Red Parity fish: digits in adjacent cells on the red line and in adjacent red bubbles alternate odd/even parity. For clarity, the column of red bubbles "intersects" with the red line across the white dot.

Blue region sum fish: the 5 digits in blue fish cells sum to the same total as do the digits in the 2 blue bubble cells.

Sven Neumann’s Sudokupad