Logic Masters Deutschland e.V.

This puzzle consists of four puzzles sharing the same grid layout. They appear visually identical; however, the outside clues have different meanings in each puzzle. The rules for these four puzzles are as follows:

Common Rules:

·Odd/Even Lines:

Digits along red lines alternate between odd and even.
·Inequality:

Inequality signs between two cells point toward the smaller digit.
·Shared Cells:

Shaded cells must contain the same digit in all four puzzles. All shared cells are given.

Variant-Specific Rules:

·Skyscrapers (top-left):

A clue X outside the grid indicates the number of buildings visible from that side in that direction.
Taller buildings block the view of shorter ones behind them.
·Sandwich (top-right):

A clue X outside the grid indicates that the digits between 1 and 9 in that direction sum to X.
·X-Triplet Average (bottom-left):

A clue X outside the grid indicates that the (X−1)-th cell, the X-th cell, and the (X+1)-th cell in that direction have an average of X.
·Numbered Room (bottom-right):

A clue X outside the grid indicates that X appears in the N-th cell in that direction, where N is the digit in the cell immediately adjacent to the clue.

You may solve the combined puzzle or the four puzzles individually using the links below:

The difficulty is estimated at 4–5 stars. Enjoy solving!