Sudoku Hard is a free browser game on SolitaireFelt, built for a short break that can stretch into a long session. There is no download, no sign-in, and no backend: the puzzle runs in this tab and your best results stay in local storage on your device. That keeps the page fast, private, and easy for Google to crawl as a real game page rather than an empty iframe.
Sparse givens. Naked pairs and pointing pairs help. It sits in our Sudoku & Numbers collection because people already search for this mechanic by name. The rules below match the familiar version of the game, with original board art and a full felt table for play.
How to play Sudoku Hard
Fill 1–9 so each row, column, and 3×3 box is unique. Given gold digits cannot be changed. Daily Sudoku uses today's date as the shuffle seed so everyone sharing the calendar day gets the same grid.
Tips
Pencil in box candidates. If a number exists in two rows of a box, it is not in the third.
If you enjoy Sudoku Hard, open the related games under this page. A full niche catalog — solitaire variants, mahjong layouts, daily sudoku, word puzzles, and board games versus a computer — is what makes SolitaireFelt worth bookmarking instead of a three-page demo.
