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Standard Skyscrapers Rules: Insert digits 1-5 into the grid so that no digit repeats in any row or column. Also, each number in the grid represents the height of a building and the clues on the outside of the grid indicate how many buildings can be “seen” when looking from that direction. Taller buildings block the view of smaller buildings. For example, if a row contained the numbers 15342, then two buildings are seen from the left – 1 and 5 – and three buildings from the right – 2, 4, and 5 – with the other buildings blocked by taller buildings in front of them.

Also, some cells have been split into triangles, each of which must be filled with a number.

(The split cells are viewed in the order they are seen from a given direction, so the upper triangles are seen first from the left/top sides and the bottom triangles are seen first from the right/bottom sides.)

For automatic solution checking, the numbers must be entered in green, blue, or red, with large digits (Sudoku mode) in regular cells and small digits (Number candidates mode) in appropriate corners of split cells.
CTRL + z CTRL + y Erase elements that belongs to the selected mode Erase problem or solution grid

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