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Objective

Fill the grid with numbers so that all rules are satisfied:

• Each row contains every number exactly once.
• Each column contains every number exactly once.
• Each chain contains every number exactly once.

Some numbers are already given. Use logic to complete the grid.

Grid and Numbers

• Board sizes range from 4x4 to 9x9.
• In an N x N grid, you use the numbers 1 to N.
• The position of numbers is not ordered - only the rules matter.

Rows and Columns

• Every row must contain all numbers from 1 to N.
• Every column must contain all numbers from 1 to N.

Chains

• The grid is divided into chains - groups of connected cells.
• Each chain contains exactly N cells.
• In each chain, all numbers from 1 to N must appear once.
• Chains can have any shape, as long as cells touch by edges.

Given Numbers

• Some cells are prefilled and cannot be changed.
• These numbers serve as clues to help you solve the puzzle.

Progress

Start with smaller boards like 4x4 to learn the rules and patterns.
As you advance, move on to 5x5, 6x6, and larger grids for a greater challenge.

Features

• 4200+ logic puzzles
• Grid sizes from 4x4 to 9x9
• Bonus levels for advanced players
• Day and night mode
• Cell notes for tracking possibilities
• Hints when you are stuck
• Undo moves at any time
• Highlighting of errors

Train your logic, enjoy the chains, and have fun solving every puzzle in Chainlink.