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Place numbers 1 to 4, each once, in only white cells of each row and column. Numbers in gray cells are sum of orthogonally adjazent white cells.

Puzzle:

Fill the grid with the digits 1 to 6. The digits represent the height of the skyscraper in each cell. Each row and column has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from
that vantage point.

The difference between orthogonal adjazent cells is never 1.

Fill the grid with the digits 1 to 5 and with parks. The digits represent the height of the skyscraper in each cell. Each row and column has exactly one of each digit and one park. The clues along the edges tell you how many skyscrapers you can see from that vantage point.

Fill the grid with the digits 1 to 6. The digits represent the height of the skyscraper in each cell. Each row and column has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point and/or what the first number is that you can see.

Fill the grid with the digits 1 to 6. The digits represent the height of the skyscraper in each cell. Each row and column has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from
that vantage point.

The coloured points tell you whether the sum in the marked cage is odd (yellow point) or even (green point). In cages there can't be the same digit repeated.

Fill the grid with the digits 1 to 6. The digits represent the height of the skyscraper in each cell. Each row and column has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from
that vantage point.

Fill the grid with the digits 1 to 6. The digits represent the height of the skyscraper in each cell. Each row and column has exactly one of each digit. The number in the cells with arrows tell you how many skyscrapers you can see in direction of the arrow.

Hint: In diagonals it is allowed that heights are repeated.

Fill the grid with the digits 1 to 6. The digits represent the height of the skyscraper in each cell. Each row and column has exactly one of each digit. The clues along the edges tell you not how many skyscrapers you can see from
that vantage point.

Fill the grid with the numbers 1 to 6. The numbers represent the height of the skyscraper in each cell. Each row and column has exactly one of each digit. The clues along the edges tell you how many skyscrapers you can see from that vantage point. The sums of the numbers within each sub-region are equal to each other. In sub-regions there can't be the same number repeated.

Fill the grid with the digits 1 to 6. The digits represent the height of the skyscraper in each cell. Each row and column has exactly one of each digit. The clues along the edges tell you the sum of the skyscrapers you can see from
that vantage point.