About PencilGrid

PencilGrid is a free puzzle site. We serve daily Sudoku and Nonogram puzzles you can solve in your browser. No account, no paywall, no ads interrupting the grid.

Progress is saved locally in IndexedDB. Come back anytime, your puzzle state persists. Puzzles are pre-generated offline, delivered as static JSON, so they load fast.

We built this because we wanted a clean, fast puzzle experience. Warm paper colors, tabular numerals, keyboard shortcuts, and printable PDFs. The design is editorial—meant to feel like a printed puzzle book, not a gamified app.

Why Free?

Sudoku and Nonogram are traditional puzzles. Algorithms to generate them are well-known. We're not doing anything novel—we're packaging existing logic in a clean interface.

Ads appear above or below the puzzle, never mid-solve. If you use an ad blocker, the site still works. Your browser handles persistence; we don't run a backend for user data.

How Puzzles Are Made

Sudoku puzzles are generated with a backtracking solver. Nonogram puzzles use a constraint-based generator that ensures unique solutions. Both are run offline in batch, then deployed as static files.

Daily puzzles update at midnight UTC. Practice puzzles cycle through a pool so you get variety without seeing the same one twice in a session.