Play Today's Numbergrids Daily Puzzle

How to Play Numbergrids

Modes: Classic · Daily

Each row and each column must contain the numbers 1 to N exactly once.

There are no boxes — the row and column rules are all you need.

Tap a cell and choose a number from the pad; use the eraser to change it.

Fill every cell to complete the grid.

Rules

No number repeats in any row or column.

Every row and column uses all numbers 1 to N once.

Conflicting duplicates are highlighted in red.

Scoring

History & Origins of Numbergrids

A Latin square is a grid in which every row and every column holds each symbol exactly once — a deceptively simple rule with a surprisingly long history. Early examples are scattered through medieval manuscripts, and the eighteenth-century mathematician Leonhard Euler, who wrestled with them in his "36 officers" problem, is the one who gave them the Latin-flavored name we still use today.

Cross-number and number-placement grids have filled the puzzle pages of newspapers and magazines for decades, but the Sudoku boom of the early 2000s turned plain row-and-column logic into a worldwide habit. Numbergrids descends from that craze’s stripped-back cousins: take away the 3-by-3 boxes and what remains is the pure Latin-square core that Sudoku quietly depends on — logic-only deduction, with no arithmetic and no guesswork.

ThinkyPlay’s Numbergrids brings that clean idea to the browser. Every puzzle is generated on the spot and verified to have exactly one solution, so you can always reason your way through rather than gamble. Difficulty is set by board size — from a gentle 4-by-4 up to a demanding 6-by-6 — and the Daily Numbergrids hands every player on the planet the same grid to race against the clock.

Common Mistakes to Avoid

• You fill a row, call it done and move on — but each number must also be unique down its column. Cross-check the crossing cell before you leave.
• Blue-tinted givens are locked — tapping one never selects it. Don’t waste clicks trying to overwrite a given you suspect is wrong; only white cells accept your numbers.
• There is no pencil-mark notes mode — numbers are entered directly and a new tap overwrites the old one. On 6×6, keep your candidate reasoning tidy.
• Only the newest of two duplicates turns red; the earlier copy stays unmarked. Scan the whole row and column for its twin before erasing.
• Hint only fills cells whose correct value is safe to place right now. Wrong guesses blocking everything bring "No safe hint" — clear the conflict first, then ask again.

Tips & Strategy

Rows with only one gap are instant wins.

When a number fits only one spot in a column, place it.

Cross-check each candidate against its whole row and column.

Frequently Asked Questions

Is Numbergrids free to play?

Yes — Numbergrids on ThinkyPlay is free, with no download and no sign-up.

What are the rules?

Fill each row and each column with 1 to N exactly once — a Latin square, like Sudoku without the boxes.

Is there a daily game?

Yes — the Daily Numbergrids gives everyone the same puzzle each day.

How do the Easy, Medium and Hard levels differ?

Each difficulty is a different board size: Easy is 4×4, Medium is 5×5 and Hard is 6×6. The rule never changes — only the grid grows, so every row and column must hold more numbers and each deduction you make has more places to go.

Is every Numbergrid guaranteed to have just one solution?

Yes. The generator removes one starting cell at a time and keeps the removal only while the puzzle still has exactly one solution. That means every board can always be finished by logic alone — no guessing required.

Is Numbergrids an arithmetic puzzle like Kakuro or KenKen?

No — there are no sums, cages or calculations anywhere. Numbergrids is a pure placement puzzle: every row and every column must contain the numbers 1 to N exactly once, so all your reasoning is about positions and duplicates, never arithmetic.

Why does the Hint button sometimes refuse to help?

Hint only acts when it can place a correct number without creating a conflict. If your guesses block every empty cell’s safe spot, it shows "No safe hint — clear a conflicting value first". Erase the red duplicate, then the hint works.