Snail

Snail example
Rules: Fill some of the cells with a number from 1 to n (n is given in each puzzle, 1–3 in the example) such that each row and column contains every number from 1 to n exactly once (the rest of the cells will be left blank). Going clockwise around the snail, the numbers must be encountered in sequence such that the first number is 1, the second 2, and so on, and after n the sequence repeats again: 1, 2, …, n, 1, 2, …, n, …, 1, 2, …, n (1, 2, 3, 1, 2, 3, …, 1, 2, 3 in the example). Dot clues (•) mark empty cells.

Also known as Magic Spiral.

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