Logic Masters Deutschland e.V.

Recently when I was watching the video about the solution path of another full rank puzzle, I came up with this idea -- 54-Full rank combining chaos construction and full rank. Later due to the 3rd dimension (region) it has been renamed to "3D Full rank"

Chaos Construction:

Divide the grid into 9 regions. All regions are one-cell wide and nine-cells long, orthogonally connected snakes. No T-shaped tetraomino (branch) or O-shaped tetraomino (2x2 area) may entirely be in a single region. Place the digits 1~9 once each in each row, column, and region. Region borders are partly given.

3D Full Rank:

All rows, columns and regions are regarded as 54 9-digit numbers in total read from both directions. All 9-digit numbers cannot repeat.

Ranking the 54 numbers from the lowest (1) to the highest (54), a clue outside the grid represent the ranking of the 9-digit number in that row/column read from the clued side to the other side. A clue in the top left corner of a cell in the grid indicates the ranking of the 9-digit number in that region read from clued end to the other end.

All cells with a clue, including '?', must be at an end of a region (ie. only 1 of 4 orthogonally neighboring cell is in the same region). To clarify, a '?' represents any number from 1 to 54, not necessarily be a single-digit number.

Play on CTC! (without draft area)

Play on CTC! (with 4x9 draft area)