EITBON 3: Forgotten Shapes

(Published on 18. July 2025, 20:29 by Neokart)

Hi everyone. This is the 3rd part of the series inspired by The Carebear's album "Everywhere in the Beginning of Nowhere". I hope you like it.

Rules:

1. Normal sudoku rules apply: Each row, column and outlined 3x3 box contains each digit from 1 to 9 exactly once.
2. Thermometer: Digits on a thermometer increase from the bulb end.
3. Kropki Pairs: Digits joined by a white dot must be consecutive. Digits joined by a black dot (with a 3) must be in a 1:3 ratio (i.e. one is triple the other). Not all possible dots are necessarily given.
4. BYO Palindromes: A palindrome line is a non-branching line which digits on it read the same forwards and backwards. Draw three different palindrome lines, such that each line starts from one of the ends of the brown line (r1c3, r1c5, and r1c6) and moves along the brown line, visiting at least two cells.

A palindrome line cannot cross or touch itself (i.e., visit the same cell more than once).
The palindrome lines can cross or touch each other (i.e., share a cell). However, they cannot have overlapping segments (i.e., share a pair of cells that are adjacent along their paths).
Not all cells on the brown line are necessarily visited by any of the three palindrome lines.

Solve on SudokuPad

Note: Here's an example puzzle for the BYO Palindromes rule, taken from the puzzle Astronauta