Logic Masters Deutschland e.V.

Normal Sudoku rules apply in the main 9x9 grid.

Cells one chess knight's move apart in the main 9x9 grid may not contain the same digit.

Digits do not repeat in a cage.

All lines are palindromes and read the same forwards and backwards. The different shades are for clarity.

Clues outside the grid are skyscraper clues. Digits in the grid represent skyscrapers of that height. Higher skyscrapers obscure smaller ones. Clues outside the grid show the number of visible skyscrapers in that row/column from the clue's direction of view.

Note: for solution check to work, input 0s into all non-palindrome cells outside the grid.

SudokuPad