Both 6×6-sized puzzles are rather tough. You have been warned.
Regular Skyscrapers rules.
Regular Skyscrapers rules apply. However, the clues have been encrypted: different letters stand for different numbers, same letters stand for the same number. Determining which letter stands for which number is part of the puzzle.
This one is a hybrid of Skyscrapers and Easy As ABC (with numbers from 1 to 6, instead of A, B and C). Each clue is either a Skyscrapers clue or Easy as 123456 clue, but not both. This is the hardest of the bunch, in my opinion.