Number Link
Connect matching numbers with paths that fill every cell. No crossings. No empty squares.
5×5
Easy · 3 pairs
20 puzzles
6×6
Medium · 4 pairs
20 puzzles
7×7
Hard · 5 pairs
20 puzzles
8×8
Expert · 6 pairs
20 puzzles
How to play
- Click (or tap) a number and drag to its matching number
- Paths travel horizontally or vertically — no diagonals
- Every cell must be filled — no empty squares allowed
- Paths cannot cross each other
What Is Number Link?
Number Link (also called Numberlink) is a logic puzzle played on a rectangular grid. Each puzzle contains pairs of matching numbers. Your goal: draw a continuous path connecting each pair of matching numbers, making sure the paths cover every single cell in the grid without crossing each other.
Number Link puzzles originated in Japanese puzzle magazines in the 1990s, published by Nikoli — the same company that popularized Sudoku.
How It Works
Each puzzle has a unique solution. Paths travel horizontally or vertically — never diagonally. The constraint that every cell must be filled is what makes Number Link genuinely challenging: you can't just connect the numbers the shortest way, you have to plan routes that use every square.
Frequently Asked Questions
How do you solve Number Link puzzles?
Start by identifying constrained pairs — numbers in corners or along edges have fewer possible paths. Work outward from these, then fill in regions that only one path can reach. The rule that every cell must be filled is your most powerful tool: if a pocket of cells can only be reached by one specific path, that path must go there.
What is the strategy for path puzzles?
Think in regions, not just routes. Divide the grid mentally into areas and ask: which path "owns" this area? Dead-end regions give you certainty. Also watch for the parity rule: in many puzzles, you can use a checkerboard-coloring argument to determine which direction paths must travel.
Are Number Link puzzles always solvable?
Every well-formed Number Link puzzle has exactly one valid solution. All 80 puzzles in this game have been hand-crafted and verified to have a unique solution where every cell is filled. If you get stuck, use the Hint button to reveal one complete path.