Sudoku
Sudoku that grades puzzles by the logic they need and explains each hint, with undo, pencil marks and a daily puzzle.
Sudoku for puzzle fans where every puzzle can be solved by logic alone, never by guessing. Ask for a hint and you get the technique and the reason, not just the number, so you learn as you play.
Where do I open Sudoku?
Open Sudoku at https://sudoku.nubosuite.tech or from the Apps tab in Nubo Home. You sign in once with your Nubo account for every app; see Create an account and sign in.
What can Sudoku do?
- Honest difficulty. Levels reflect the techniques a puzzle forces on you.
- Explained hints. Names the technique and highlights the cells.
- One solution. Uniqueness is checked for every puzzle.
- Daily puzzle. The same one for everyone each day.
Easy to Expert, measured by reasoning
Easy and Medium use singles, differing in how many clues you start with. Hard needs pointing pairs and naked pairs. Expert needs hidden subsets, X-Wings and Y-Wings.
Learn the deduction, not just the answer
A hint might say that a digit in a box can only sit in one row, so it can be removed elsewhere in that row. The cells involved are highlighted.
Total undo and redo
Try a line, back out of it, and carry on. Hint eliminations are kept apart from your own pencil marks so repeated hints keep moving forward.
What else is in Sudoku?
- No guessing. Puzzles the technique ladder cannot finish are rejected.
- Keypad counts. Shows how many of each digit remain.
- Keyboard play. An accessible grid you can drive from the keyboard.
- Records. Personal bests, merged so one can never be lost.
- Account copy. Optional second copy of your progress.
- Steady timer. Keeps counting correctly in a background tab.
Which apps does Sudoku work with?
Sudoku works with Solitaire, Chess, Checkers, Backgammon, Notes, Teams. Apps in one team share the same people and the same team drive; see Teams and sharing.
Common questions about Sudoku
Is every puzzle solvable without guessing?
Yes. Generation rejects any grid that the human-technique solver cannot finish.
Do I need an account?
No. Progress saves in your browser first. An account is an optional second copy.
Is the daily puzzle the same for everyone?
Yes. It uses a seeded generator, so everyone gets the same grid for the day.
Where can I read more?
The product page for Sudoku on the main site has screenshots and the current plan details: https://nubosuite.tech/en-in/products/sudoku/. For problems, see Troubleshooting or Support.