This puzzle was invented by Jeff Widderich.
Puzzle and Goal
An unsolved puzzle is a square grid containing some number clues.
Number clues on black cells do not need to belong to a "staight".
The goal is to place numbers in all white cells according to the clues and the rules.
The solved grid must satisfy the following conditions:
No number appears twice in any rank.
Contiguous cells must contain consecutive numbers, although possibly not in order.