Logic Masters Deutschland e.V.

Japanese Sums Anti-Knight Samurai Windoku

Four standard 9x9 sudoku grids are given, with a fifth grid superimposed on the other four, sharing digits with each.

Outside the grid are colored clues. These indicate the sum of the contiguous region in that row or column that is shaded the color of the clue. There must be an unshaded cell between regions of the same color.

Furthermore, normal anti-knight rules apply, meaning digits a knight's move in chess apart cannot be the same digit.

Importantly, for the sake of the anti-knight rule, treat all five grids as one continuous grid. This means cells from one grid can see and affect a cell in another grid. Important note: the path taken must traverse actual cells the entire path, i.e. no jumping over whitespace.

See the image below for an example. It shows an invalid placement of 1s and a valid placement of 2s.

Do note this is a long puzzle and may take you more than session to complete. A great way to save your progress is to use the 'Clone' button in Penpa and saving that new URL.

Penpa+: https://tinyurl.com/yc3ao7s2