Logic Masters Deutschland e.V.

THE RULES

• Normal 4X4 Sudoku rules apply: The grid must be filled with the numbers 1-4, such that every digit appears exactly once in every row, column, and box.

• Cells touched by Vertical Lines are Column Indexers: In that cell, let its digit be x and its column be y; in the cell's row, in column x sits digit y. Not every Column Indexer is necessarily given.

Example: The given digit 1 is in R1C2. Imagine it is a Column Indexer. In the same row, the digit in column 1 would be the digit that represents the column in which the initial 1 was placed. If the given 1 is a Column Indexer, R1C1 is the digit 2.

• Cells touched by nearly Horizontal Lines are Row Indexers: In that cell, let its digit be x and its row be y; in the cell's column, in row x sits digit y. Not every Row Indexer is necessarily given.

Play it at Sven's SudokuPad here

I welcome each and every comment or suggestion.