A grid-based logic puzzle where segments are the key
Segmento is a number puzzle played on a square grid (6×6 up to 12×12). The grid is divided into segments, which are groups of consecutive cells within each row and column. Your job is to fill every empty cell so that each segment contains the numbers 1 through N, where N is the length of that segment.
Each row is split into one or more segments, and each column is also split into one or more segments. Segments are shown by thick border lines inside the grid.
This row has two segments: one of length 2 (needs 1, 2) and one of length 3 (needs 1, 2, 3).
A segment of length 3 must contain exactly 1, 2, and 3. A segment of length 5 must contain exactly 1, 2, 3, 4, and 5.
Every cell belongs to both a row segment and a column segment. The value you place must satisfy both. This is where the logic comes from!
Some cells start pre-filled with red numbers. These are clues: fixed values you cannot change. Use them to deduce the rest of the grid.
Larger grids (10×10+) may include black cells: blocked squares that split segments in both directions. They act as walls. No number goes in a black cell, and they create shorter segments on either side.
When a cell has only one possible value (because all other numbers are eliminated by its row and column segments) that value must go there. This is the most common technique and the only one needed for Beginner puzzles.
When a number can only go in one cell within a segment, it must go there, even if that cell has other possibilities. Easy puzzles require this technique.
When two cells in a segment can only contain the same two values, those values are locked to those cells. Eliminate them from all other cells in the segment. Medium puzzles use this.
When two values can only appear in the same two cells within a segment, those cells are locked to those values. Eliminate all other possibilities from those cells. Hard puzzles require this.
Fills all empty cells with every valid candidate number. Updates automatically as you place values. Essential for spotting singles and pairs.
Two-stage hint system. First click highlights the target cell. Second click reveals the answer. Works with naked singles, hidden singles, and pairs.
Select a filled cell to highlight all matching numbers across the grid in teal. Helps track number distribution.
When a number is highlighted, marks cells where that number cannot go in orange. Also excludes numbers too large for a segment.
| Level | Techniques Required |
|---|---|
| Beginner | Naked Singles only |
| Easy | Naked + Hidden Singles |
| Medium | Singles + Naked Pairs |
| Hard | Singles + Naked + Hidden Pairs |
Start with Beginner puzzles to learn the mechanics, then work your way up!
🧩 Play Segmento