Logic Masters Deutschland e.V.

This Sudoku pack is themed around the three constraints Sandwich, Skyscrapers and X-Sums. Two Sudokus in a regular grid, two in a regular grid where additional constraints cross the grid border, and two Chaos Constructions.

Rules and links can be found below.

The difficulty increases, not neccessarily from puzzle to puzzle, but the first three are defenitely easier than puzzles 4-6. I estimated a 3/5 as the average.

Puzzle 3 (Hot Sandwich) is inspired by Hot Court by ICHTUES.
Puzzle 6 (Chaotic Sandwich) is inspired by Chaosandwich by grkles.





Rules

(1) Skyscraper Sums
Normal 6x6 Sudoku rules. Digits in the grid represent skyscrapers of that height. Higher skyscrapers obscure smaller ones. A clue outside the grid shows the sum of all visible skyscrapers in the corresponding row/column from the clue's direction of view.

(2) Little Killer X-Sums
Normal 6x6 Sudoku rules. A clue outside the grid is both a Little Killer clue and an X-Sum clue:
- it shows the sum of the digits along the indicated diagonal, which can include repeats if allowed by the other rules
- it shows the sum of the first X cells in that clue's row/column, where X is the digit in the cell nearest to the clue

(3) Hot Sandwich
Normal Sudoku rules apply to the 6x6 grid. Digits along a Thermometer increase from the bulb. Clues outside the 6x6 grid show the sum (up to 14) of the digits sandwiched between the 1 and the 6 in the corresponding row/column.

(4) Renban Skyscrapers
Normal Sudoku rules apply to the 6x6 grid. Each purple line contains a sequence of non-repeating consecutive digits, which can be in any order. Digits in the 6x6 grid represent skyscrapers of that height. Higher skyscrapers obscure smaller ones. Clues outside the 6x6 grid show the number of visible skyscrapers in the corresponding row/column from the clue's direction of view.

(5) Chaotic X-Sums
Irregular 6x6 Sudoku rules apply and the regions must be determined. A region is an orthogonally connected group of 6 cells that contains the digits 1-6. Clues outside the grid show the sum of the first X cells in the corresponding row/column, where X is the digit in the cell nearest to the clue. In addition, the first X cells in this row/column are in the same region, and the X+1th cell is in a different region.

(6) Chaotic Sandwich
Irregular 6x6 Sudoku rules apply and the regions must be determined. A region is an orthogonally connected group of 6 cells that contains the digits 1-6. A clue outside the grid gives the sum of the digits sandwiched between the nearest and the farthest region border in that row/column. A row/column with a clue must therefore contain at least two region borders. The edge of the grid does not count as a region border. (The above-linked "Chaosandwich" by grkles contains a 4x4 example.)


Links

f-puzzles
Skyscraper Sums -- Little Killer X-Sums -- Hot Sandwich -- Renban Skyscrapers -- Chaotic X-Sums -- Chaotic Sandwich

ctc-app
Skyscraper Sums -- Little Killer X-Sums -- Hot Sandwich -- Renban Skyscrapers -- Chaotic X-Sums -- Chaotic Sandwich

penpa+
Skyscraper Sums -- Little Killer X-Sums -- Hot Sandwich -- Renban Skyscrapers -- Chaotic X-Sums -- Chaotic Sandwich

I recommend penpa+ for puzzles 3 and 4. Answer check is for numbers inside and outside the grid. (And for puzzles 5 and 6 also on edges.)

In the ctc-app, make sure to turn off the conflict checker for puzzles 3-6.

Have fun solving!