Easy
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Train your mind. Cultivate focus.
Simple to learn, infinite to master
The grid consists of 81 cells — 9 rows, 9 columns and 9 square 3×3 regions.
Fill every empty cell with a number from 1 to 9 until the grid is complete.
Every horizontal row must contain all numbers from 1 to 9 exactly once, without repetition.
Every vertical column must also contain all numbers from 1 to 9 exactly once.
Every region (3×3 square) must contain all numbers from 1 to 9 exactly once.
There is only one valid solution per grid. No luck — pure logic only.
Level up fast with these proven techniques
If a cell has only one possible candidate, that number must go there. Always start by identifying these cells — they often unlock the rest of the grid.
A number that can only go in one place within a row, column or box must be placed there — even if that cell appears to have multiple candidates.
Enable Notes mode and write all possible candidates in every empty cell. By eliminating impossible candidates step by step, the solution appears naturally.
If a number already exists in a row or column, it cannot appear again. Mentally cross it off all other cells in that row and column.
In a 3×3 box, if a number can only appear on one row or column, eliminate it from other boxes on that same row or column.
If two cells in the same unit contain only the same two candidates, those numbers are reserved for those cells and can be eliminated from all other cells in the unit.
Instead of guessing, eliminate impossibilities. Every certainty you place reduces the options for neighbouring cells — work methodically box by box.
Start with Easy to master basic techniques, then gradually move to Medium and Hard. Consistency is the key to progress.