Logic Masters Deutschland e.V.

This is my entry from round 7 of season 1 of the Skunkworks League, hosted by damasosos92.

In this round, the prompt was to create a 2 or 3 star difficulty quattroquadri using one instance each of at least eight different standard local constraints.

Don't forget to check out the other puzzles from the round. Those that are published here should all have [TSL] and [S1T7] in the title.

Quattroquadri: Place a digit from 1-9 in each cell such that digits do not repeat in any row, column, or 3x3 box.

Little Killer: Digits along a marked diagonal must sum to the given total.

Lockout lines: Digits along a lockout line must not have values between or equal to those of the digits in the two diamonds at the ends of the line. The digits in the diamonds must differ by at least 4.

Look-and-Say cages: The clue in the top left of a blue cage, when read digit by digit, specifies the number of times some digits appear in the cage. For instance, a clue of 1622 reads as "One 6, two 2s."

Killer cages: Digits in a black cage may not repeat and must sum to the total given in the top left.

Numbered Rooms: A red clue outside the grid indicates the digit that must be placed in the Nth cell in the corresponding direction, where N is the digit in the cell adjacent to the clue.

Parity lines: Along a red line digits must alternate in (odd/even) parity.

Renban: The digits along a pink line must form a non-repeating consecutive set, but may appear in any order.

Sandwich: A green clue outside the grid indicates the sum of the digits sandwiched between the highest and lowest digits appearing in that row or column.

Skyscrapers: Each digit in the grid represents the height of a building in its cell. Taller buildings obstruct the view of shorter ones behind them. A blue clue outside the grid gives the number of buildings visible from that vantage point in the clue's row or column.

Thermo: Digits along a grey thermometer must strictly increase starting at the bulb end.

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