Printable Infinity Sudoku PDF (Record Puzzles)

Updated 6 October 2026

This booklet prints 16 of the hardest sudoku puzzles ever published, taken from Suuudokuuu’s Infinity tier: Arto Inkala’s Everest, AI Escargot, Platinum Blonde, Golden Nugget and other record grids, each with a published SE (Sudoku Explainer) rating between 10.4 and 11.9. Every one has exactly one solution, and the solved grids are at the back.

What is inside the booklet

The puzzles are printed exactly as they were published, with no reshuffling, so you can compare your grid with the originals discussed on the hardest sudoku puzzles page. They print 4 to a page with room for a full set of pencil marks, which you will need: at this level most solvers keep every candidate written in and test chains on a separate sheet. The final pages hold the completed grids, so you can check a long line of reasoning without having to finish it first.

How hard these puzzles are

Very. Every puzzle in the Infinity set has a published SE rating of at least 10.4, well past anything the generated tiers or the Hell corpus produce. Our own rater stops pricing the SE ladder at 8.5, so the figures quoted here come from independent raters, and our technique engine cannot finish any of these grids on its own. Expect to need long forcing chains and forcing nets, and expect a single puzzle to take far longer than anything else on this site.

Where to go next

Want to warm up first? The printable Hell sudoku booklet holds forcing-chain puzzles that are hard but still within reach of our technique ladder. Prefer a screen? Play the same record puzzles on the Infinity sudoku lander, where each game reshuffles the grid, or browse every booklet on the printable sudoku hub.