Printable Evil Sudoku — 4 Per Page

Four freshly generated evil sudoku puzzles on one A4 or US Letter sheet — the hardest tier we generate, packed into a four-up layout for advanced solvers who want a multi-week ration. Evil grids ship at or near the proven 17-given theoretical floor, take ninety minutes to several hours to solve, and reward only the most thorough candidate-notation workflows. Four puzzles per sheet is therefore six to twelve hours of solving on a single printed page.

The four-per-page layout is a deliberate trade-off at this difficulty. Cell widths print at roughly seven to eight millimetres on the long edge, which is the lower bound for the full nine-candidate notation evil puzzles demand. If your handwriting is small and precise, you will find the cell space adequate; if you prefer roomier pencil marks, the one-per-page layout gives you a fifteen-to-seventeen-millimetre cell at the cost of one puzzle per sheet of paper. There is no wrong choice — the puzzles themselves are identical regardless of layout.

What does change between layouts is the rhythm of solving. A four-per-page evil sheet is intentionally a long-form commitment. Many solvers print one on a Friday and chip away at it across two or three weekends. The folded sheet survives backpacks, briefcases, and back pockets without losing the candidate marks you have already written. Each puzzle prints with its ID number and a QR code in the corner; scan the code to open that specific puzzle in the on-screen solver if you want to verify a partial solution or take a screenshot of where you have left off.

The four puzzles on a single sheet are independent, drawn from four different seeds, with four different solving paths through the same evil difficulty. Refresh the page and you receive four new puzzles at the same tier. Evil puzzles regularly require X-wings, swordfish, XY-wings, XYZ-wings, simple colouring, and the occasional forcing chain — none of which can be skipped without breaking the unique-solvability guarantee. Every grid here is solvable by logic alone; no guessing is required at any step, however deep into a chain you find yourself.

Four-per-page printable evil sudoku is free, with no account gate, no per-day generation limit, and no watermark on the sheet. The license permits free non-commercial reproduction in any setting you find useful — personal, classroom, care home, religious, community. If you want the densest possible batch on a single sheet, switch to six-per-page; if you prefer the largest cell width for dense candidate notation, switch to one-per-page.