Gokigen Naname

Gokigen Naname, also known as Slant,[1] is a binary-determination logic puzzle published by Nikoli.

[2] Gokigen Naname is played on a rectangular grid in which numbers in circles appear at some of the intersections on the grid.

The object is to draw diagonal lines in each cell of the grid, such that the number in each circle equals the number of lines extending from that circle.

Additionally, it is forbidden for the diagonal lines to form an enclosed loop.

Unlike many of Nikoli's similar puzzles, such as Hashiwokakero, a single network of lines is not required.

A solved Gokigen Naname puzzle
A solved Gokigen Naname puzzle
Easy to spot patterns: middle 4, corners 0 or 1, edges 0 or 2.
Easy to spot: middle 4, corners 0 or 1, edges 0 or 2.
Gokigen naname solving technique for single numbers.
Deduction from a single number. Red and blue patterns imply each other.
Gokigen naname solving techniques for 2 numbers.
Deductions for two numbers.
Gokigen naname, combining solving techniques.
Combining solving techniques.
Gokigen naname tchniques: deductions avoiding to close a path.
Deductions avoiding to close a path.