Building Puzzle

Link to Japanese version
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  • Normal
  • Easy
Hint
Fix

[Rule]

Fill in all of the blank squares with digits 1-n (up to the board size) according to the following rules.

  1. Each column and each row must contain all of the digits from 1 to n.
  2. Each digit which is outside of the board shows the number of the buildings from which you can see. (You can see the higher building over the lower buildings but cannot see the lower buildings over the higher building.)

[Operation]

  1. "Back" -> 1 step back, "Restart" -> Restart from the scratch.
  2. "hint" -> Some of the erasable numbers turn red.