Rules for Skyscrapers
Rules for Easy as ABC
This puzzle solves as a regular Skyscraper with digits 1-6. It's quite a tough puzzle.
This puzzle also solve as an Easy as ABC puzzle, but instead of letters you fill in the digits 1-4 in each row and column.
Easy as ABC Lookalike
This puzzle solves as a regular Easy as ABC puzzle, with letters A-D.
It also solves as a Cryptic Skyscrapers puzzle with digits 1-6. Each letter stands for a different number and all occurences of a particular letter are the same number. This one is also the harder of the 2 puzzles.