Sudoku vs Suguru: Which Number Logic Puzzle Fits You

Sudoku builds logic from three overlapping unit types

Classic Sudoku uses a 9x9 grid divided into nine rows, nine columns, and nine 3x3 boxes. Every one of those units must contain the symbols 1 through 9 exactly once. The digits do not act as quantities, so arithmetic is unnecessary. You solve by asking where a missing symbol can still appear and by removing candidates that conflict with placements in the same row, column, or box. Easy puzzles may fall to scanning and singles, while harder ones introduce pairs, locked candidates, fish patterns, wings, and chains. Shapedoku keeps this exact structure but replaces the digits with nine glowing shapes: triangle, hexagon, circle, crystal, heart, diamond, square, crescent moon, and lotus flower. That makes the symbolic nature of Sudoku especially clear. A heart is not larger than a circle; it is simply one of nine distinct tokens. Sudoku suits players who enjoy a stable framework where the rules never change and increasingly subtle candidate relationships emerge inside it.

Suguru replaces rows and boxes with irregular regions and neighbors

Suguru, also known as Tectonic or Number Blocks, divides the grid into irregular regions. A region containing N cells must use the digits 1 through N exactly once. A three-cell region therefore contains 1, 2, and 3, while a five-cell region contains 1 through 5. The second rule reaches beyond the region borders: two identical digits may not touch horizontally, vertically, or diagonally. This creates an eight-cell exclusion zone around every placement. Unlike Sudoku, a row or column does not need to contain a particular complete set. The important structures are the region containing a cell and the neighboring cells surrounding it. If a 4 is placed, every touching cell loses 4 even when it belongs to another region. If a region still needs 2 and only one of its unsolved cells can use 2 after those neighbor exclusions, that cell is forced. Suguru therefore combines small set completion with very local spatial pressure.

Use the same candidate discipline in two different geometries

The strongest connection between the puzzles is candidate discipline. In Sudoku, a candidate survives only if its row, column, and box allow it. In Suguru, a candidate survives only if it belongs to the correct range for its region, is not already used in that region, and does not match any touching cell. Pairs and subsets can appear in both games. If two cells in one Suguru region are the only places for 2 and 4, those values are reserved there just as a Sudoku pair reserves two symbols inside a unit. The difference is what happens outside the set. Sudoku spreads information along whole rows, columns, and boxes, while Suguru often spreads information one cell outward in every direction. Choose Sudoku when you like long-range interactions and a deep library of named techniques. Choose Suguru when compact regions and neighborhood patterns feel more natural. Shapedoku is a calm way to explore the Sudoku side, with Easy through Extreme difficulties, Notes with smart cleanup, and Hints when a candidate pattern becomes difficult to see.

1. Choose Sudoku if you enjoy complete sets across rows, columns, and boxes.
2. Choose Suguru if you enjoy irregular regions and eight-direction adjacency restrictions.
3. In Sudoku, remove a symbol from cells that share a unit with its placement.
4. In Suguru, remove a digit from its region and from every touching cell.
5. Look for pairs and hidden placements inside a Suguru region just as you would inside a Sudoku unit.
6. Switch between the two when you want to practice the same careful elimination habit in a different geometry.