100% Free · No Download · No Sign-up

GridLogic

Pure logic, every move.

GridLogic delivers handcrafted Sudoku puzzles at every level. Fill the 9x9 grid so every row, column and 3x3 box contains digits 1 through 9 exactly once.

Play Now
Game preview will load here.
Puzzle★ 4.7Free to playHTML5

How to Play

  1. Click any empty cell to select it.
  2. Click a digit (1-9) to place it in that cell.
  3. Switch to notes mode to pencil in candidate numbers.
  4. Use the hint button if you get stuck — it highlights the next safe move.
  5. Complete every row, column and box without any conflicts to win.

Features

  • Easy, medium and hard difficulty levels
  • Notes (candidates) mode
  • Optional smart error checking
  • Hint and undo buttons
  • Timer and best-time tracking

Tips and Strategy

  • Scan for naked singles — cells that can only hold one number.
  • Eliminate candidates one row and one column at a time.
  • Look for hidden singles where a digit fits in only one cell of a box.
  • Trust logic — if you have to guess, you have probably missed a deduction.

About GridLogic

GridLogic respects your time. Every puzzle is unique, solvable by pure deduction, and tagged honestly by difficulty — no easy boards mislabeled hard to pad the catalog.

Beginners can lean on the candidate-notes mode and the smart hint button. Veterans can switch helpers off, set the timer running, and chase the leaderboard.

Privacy first

GridLogic respects your privacy. We do not require a sign-up to play, we minimize the data we collect, and we are transparent about cookies. See our Privacy Policy for the full details.