This is my first Sudoku-based puzzle ever. It& #39;s based on the "first hidden skyscraper" rule set: The numbers in the grid tell you the height of a building in that square, and the numbers outside tell you the first skyscraper you *can& #39;t* see. ABCD are variables. #puzzlesetting

I& #39;m not 100% positive this has a unique solution; my desktop is crunching that right now. I& #39;ll update this thread if it ends up being bad. If you want to see a similar problem solve: https://www.youtube.com/watch?v=_Q9E_AUdzN0">https://www.youtube.com/watch...