How to Play Suguru
Basic Rules
- 1.The grid is divided into regions (also called cages or blocks), marked by thick borders.
- 2.Each region of size N must contain the digits 1 to N. For example, a 3-cell region contains digits 1, 2, and 3.
- 3.No two adjacent cells can contain the same digit. This includes cells that are horizontally, vertically, or diagonally adjacent.
- 4.Some cells start with digits already filled in as clues. These cannot be changed.
The 8-Way Adjacency Rule
Unlike Sudoku where you only check rows and columns, Suguru uses 8-directional adjacency. A cell at position (r, c) cannot share its value with any of these 8 neighbors:
Cell X cannot have the same value as any red-highlighted neighbor
Solving Strategies
1. Start with Small Regions
Regions with 1 or 2 cells are the easiest to solve. A single-cell region always contains 1. A two-cell region contains 1 and 2.
2. Elimination by Adjacency
Look at cells with given digits. Any cell adjacent to a given digit cannot contain that same digit. This quickly eliminates possibilities.
3. Use Pencil Marks
For each empty cell, note down which digits are still possible. As you solve other cells, eliminate candidates from the pencil marks.
4. Hidden Singles
If a digit can only go in one cell within a region (based on adjacency constraints), then it must go there even if that cell has other candidates.
5. Chain Deduction
Sometimes you need to follow a chain of implications. If cell A is X, then cell B must be Y, which means cell C must be Z, etc.
Controls
- Click a cell to select it, then use the number pad or keyboard to enter a digit
- Number keys (1-5) to enter a digit in the selected cell
- Backspace/Delete to clear the selected cell
- P key or Pencil button to toggle pencil mode for noting candidates
- Ctrl+Z / Cmd+Z to undo your last move
- Ctrl+Shift+Z / Cmd+Shift+Z to redo