Logic Masters Deutschland e.V.

Rules:

1. Normal sudoku rules apply.

2. Region sum lines: for each line, digits on the line have an equal sum N within each box it passes through.

3. Little killers: the numbered arrows outside the grid indicate the sum of the digits in the corresponding diagonals.

4. Maximum cells: pink cells have to be greater than all of their orthogonal neighbors.

This puzzle is a tribute to a 'Snow Cub' award - a hiking achievement given by the Mount Club in Kyrgyzstan (and it parallels a serious mountaneering achievement 'Snow Leopard' which is much harder to come by). To become a Snow Cub you have to visit 5 hiking difficulty peaks in the National Park of Ala Archa. These peaks are associated with maximum cells in the grid. They are:

1. '30 let VLKSM' - 4217m

2. 'Elektro' - 4079m

3. 'Teacher' - 4530m

4. 'Boks' - 4293m

5. 'Adygene' - 4360m

Every mountain cell contains the greatest digit from its altitude. Other non-zero digits from its altitude have to appear at least once in the cells orthogonally adjacent to its "peak". To deduce the correspondence between peaks and maximum cells you will have to look at the map here:

Ala-Archa Map

Link to sudokupad