Futoshiki (meaning "not equal" in Japanese) is a logic puzzle. To solve it, no knowledge of mathematics is necessary beyond comparing numbers. All mysudoku.io Futoshiki puzzles are generated on the fly and guaranteed to have a unique solution.

Each Futoshiki puzzle is composed of a grid of NxN cells (easy grids are 4x4 while hard grids are 6x6). Between some adjacent cells, there are inequality signs (< and > for horizontal neighbors, ∧ and ∨ for vertical neighbors).

The goal is to fill in each cell with a number between 1 and N such that:

• Each row contains each number from 1 to N exactly once
• Each column contains each number from 1 to N exactly once
• All inequality constraints between adjacent cells are satisfied

The inequality signs always point towards the smaller number. For example, if you see 3 > 1, the sign opens towards 3 (the larger number) and points to 1 (the smaller).

Sudoku

Mythical game of Japanese origin, the goal of Sudoku is to fill a grid of numbers between 1 and 9. The difficulty comes from the fact that each row, column and sub-grid of 3x3 cells can contain each number only once. To access them, click here.

Skyscrapers

A puzzle derived from Sudoku where clues around the edge of the grid tell you how many skyscrapers are visible from that direction. To access them, click here.