About this game
Nexus Sudoku — logic on a 9×9 grid
Fill the grid so every row, column, and 3×3 box contains the digits 1–9 exactly once. Each puzzle has a unique solution. Difficulty tiers change how many clues you start with and how scoring rewards speed.
How to play
Select a cell and enter a digit, or use pencil marks for candidates. The board rejects moves that immediately contradict row, column, or box uniqueness when validation is enabled. Clear a difficulty to unlock harder sets.
Scoring
Faster completions and higher difficulties award more points. Mistakes or hints (if offered) typically reduce the score. Timers measure elapsed solve time for comparison across runs.
Strategy tips
Start with naked singles and hidden singles, then pairs and pointing pairs before guessing. Scan boxes that share a row or column to eliminate candidates systematically rather than trial-and-error.
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