This is a Nikoli original.
Puzzle and Goal
An unsolved puzzle consists of a rectangular grid. Some cells contain an arrow and a number clue.
The goal is to draw a single closed loop that satisfies the clues.
The solved grid must satisfy the following conditions:
All cells must contain a clue, contain a section of the loop, or be colored black.
No two black squares may be orthogonal neighbors.
Numbered clues indicate the number of black squares in the same rank in the direction of the arrow.
Arrow Ring; Straight and Arrow; Yalooniq