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Game Instructions & Description
How to Play Sudoku Grid
Sudoku Grid is a 9x9 number puzzle made by the CrazyArcade team. Your goal is to fill every empty cell so that each row, each column and each of the nine 3x3 boxes contains the numbers 1 to 9 exactly once. Each puzzle is built in your browser when you press Play, and a solver checks it so there is always exactly one correct answer. Pick Easy, Medium or Hard before you start. Easy puzzles begin with about 40 numbers already placed, Medium with about 30, and Hard removes as many numbers as possible while keeping the answer unique, which usually leaves 22 to 26. Select a cell and enter a number with the keyboard or the on-screen number pad. Notes mode lets you write small pencil marks for the numbers a cell could hold. The selected cell's row, column and box are shaded, and every cell with the same number is highlighted. If you enter a number that does not match the solution, it turns red and your mistake counter goes up by one. Repeats in the same row, column or box are shaded red too. There is no mistake limit, so you can erase and try again. The Hint button fills in one correct cell and adds to your hint count. The timer runs while you play, and your fastest finish on each difficulty is saved as your best time.
Controls & Interaction
Mouse / Tap: select a cell 1-9: place a number (or a note in notes mode) Shift + 1-9: add or remove a pencil note Arrow keys: move the selection Backspace / Delete / 0: erase the cell N: toggle notes mode H: use a hint
Pro Tips to Win
- Tap a given number to light up every copy of it on the board, then look for rows, columns and boxes that are still missing that number.
- The small number in the corner of each number pad key shows how many of that digit are still left to place, and a key fades out once all nine are placed correctly.
- Placing a correct number automatically removes that digit from the pencil notes in the same row, column and box, so keep notes on hard puzzles and let them clean themselves up.
Frequently Asked Questions
Q: Does every puzzle have only one solution?
A: Yes. While building a puzzle, the game removes numbers one at a time and runs a solver after each removal, keeping only removals that leave exactly one valid answer.
Q: Do mistakes or hints stop my best time from saving?
A: No. Your fastest finish on each difficulty is saved in your browser no matter how many mistakes or hints you used, and both counts are shown on the finish screen.
