Logic Masters Deutschland e.V.

• Play on f-puzzles
• Play on CTC

If you're not sure about the rule set, try [159] Echo.
It's very easy and works well as a tutorial.

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Normal sudoku rules apply.

The gray lines are palindromes.

Cells along the thermometer must increase from the bulb end.

The two cells with a circle in them contain odd digits.

The digit in the 1 position of a box indexes the 1's location in that box.
The digit in the 5 position of a box indexes the 5's location in that box.
The digit in the 9 position of a box indexes the 9's location in that box.

The positions within a box being:

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If you enjoyed this puzzle, here are a few custom searches for [159] puzzles.

• Full [159] Series by W1DEMAN
• [159] German Whispers Collection by W1DEMAN
• All [159] Puzzles any author

If you are inspired by any of my [159] puzzles, I invite you to set a puzzle featuring the ruleset. You can do so with or without the, "[159]" moniker.