How much paper does the 4-per-page format save?

These 100 hard puzzles fit on 25 sheets; printed one per page they would need 100. Including the cover and solutions, the whole pack is 43 pages.

Do individual grids still show their clue counts?

Yes — every grid carries a small label with its puzzle number and exact clue count, the same quotable mechanic as the full-page packs.

Is 16pt type readable for long solving sessions?

It is comparable to a printed puzzle book. For tired eyes or low vision, the 36pt and 43pt one-per-page packs are the better fit.

Are the hard puzzles here easier than the hard large print set?

No — hard means the same thing across the site’s four calibrated levels; only the page layout differs between the two packs.

100 Hard Sudoku Puzzles, 4 Per Page — Printable PDF

100 hard sudoku puzzles in a paper-saving four-per-page layout: 25 sheets of 9×9 grids with 16-point digits, followed by every answer key, six to a page. Each grid notes its exact clue count, and hard is the third of the site’s four calibrated levels. One free PDF sized for Letter and A4 — no signup, nothing watermarked.

Hard Sudoku 1 — Clues: 25

		7				4
				4
8		1	3
		8	9		7		3
	9			8				1
2							8
5	2			1
3				6			7
	7	6			2	8

16pt · 9×9 grid · clue count printed on each puzzle · answer keys included · 4 per page

Download 100 hard sudoku, 4 per page (free PDF)

What you get

Puzzles in set	100
Grid size	9×9
Clues per puzzle	23–28, stated above each grid
Font size	16pt digits in the 4-per-page layout
Puzzles per printed page	4
Answer keys	Included for all 100, six per page
Paper	Letter and A4 compatible at 100% scale
File size	about 152 KB (43 pages)

What's in the set

Hard Sudoku 1 — Clues: 25

		7				4
				4
8		1	3
		8	9		7		3
	9			8				1
2							8
5	2			1
3				6			7
	7	6			2	8

Hard Sudoku 2 — Clues: 23

	3		2		5		9
	5	1
	9	7			6
	6			3	8
7		2			9

4		8			2
6			1			8
						5	1

Hard Sudoku 3 — Clues: 28

Hard Sudoku 4 — Clues: 23

Hard Sudoku 5 — Clues: 28

Hard Sudoku 6 — Clues: 28

Hard Sudoku 7 — Clues: 25

Hard Sudoku 8 — Clues: 28

Hard Sudoku 9 — Clues: 23

Hard Sudoku 10 — Clues: 28

Hard Sudoku 11 — Clues: 23

Hard Sudoku 12 — Clues: 25

Hard Sudoku 13 — Clues: 25

Hard Sudoku 14 — Clues: 23

Hard Sudoku 15 — Clues: 28

Hard Sudoku 16 — Clues: 23

Hard Sudoku 17 — Clues: 28

Hard Sudoku 18 — Clues: 28

Hard Sudoku 19 — Clues: 25

Hard Sudoku 20 — Clues: 28

Hard Sudoku 21 — Clues: 25

Hard Sudoku 22 — Clues: 28

Hard Sudoku 23 — Clues: 25

Hard Sudoku 24 — Clues: 23

Hard Sudoku 25 — Clues: 28

Hard Sudoku 26 — Clues: 28

Hard Sudoku 27 — Clues: 23

Hard Sudoku 28 — Clues: 25

Hard Sudoku 29 — Clues: 28

Hard Sudoku 30 — Clues: 28

Hard Sudoku 31 — Clues: 28

Hard Sudoku 32 — Clues: 25

Hard Sudoku 33 — Clues: 23

Hard Sudoku 34 — Clues: 28

Hard Sudoku 35 — Clues: 28

Hard Sudoku 36 — Clues: 25

Hard Sudoku 37 — Clues: 23

Hard Sudoku 38 — Clues: 23

Hard Sudoku 39 — Clues: 23

Hard Sudoku 40 — Clues: 25

Hard Sudoku 41 — Clues: 25

Hard Sudoku 42 — Clues: 25

Hard Sudoku 43 — Clues: 28

Hard Sudoku 44 — Clues: 23

Hard Sudoku 45 — Clues: 23

Hard Sudoku 46 — Clues: 25

Hard Sudoku 47 — Clues: 25

Hard Sudoku 48 — Clues: 28

Hard Sudoku 49 — Clues: 28

Hard Sudoku 50 — Clues: 28

Hard Sudoku 51 — Clues: 25

Hard Sudoku 52 — Clues: 23

Hard Sudoku 53 — Clues: 23

Hard Sudoku 54 — Clues: 28

Hard Sudoku 55 — Clues: 23

Hard Sudoku 56 — Clues: 23

Hard Sudoku 57 — Clues: 28

Hard Sudoku 58 — Clues: 25

Hard Sudoku 59 — Clues: 25

Hard Sudoku 60 — Clues: 28

Hard Sudoku 61 — Clues: 25

Hard Sudoku 62 — Clues: 25

Hard Sudoku 63 — Clues: 23

Hard Sudoku 64 — Clues: 28

Hard Sudoku 65 — Clues: 23

Hard Sudoku 66 — Clues: 25

Hard Sudoku 67 — Clues: 25

Hard Sudoku 68 — Clues: 23

Hard Sudoku 69 — Clues: 23

Hard Sudoku 70 — Clues: 28

Hard Sudoku 71 — Clues: 25

Hard Sudoku 72 — Clues: 28

Hard Sudoku 73 — Clues: 25

Hard Sudoku 74 — Clues: 28

Hard Sudoku 75 — Clues: 25

Hard Sudoku 76 — Clues: 28

Hard Sudoku 77 — Clues: 25

Hard Sudoku 78 — Clues: 25

Hard Sudoku 79 — Clues: 28

Hard Sudoku 80 — Clues: 28

Hard Sudoku 81 — Clues: 23

Hard Sudoku 82 — Clues: 25

Hard Sudoku 83 — Clues: 28

Hard Sudoku 84 — Clues: 28

Hard Sudoku 85 — Clues: 28

Hard Sudoku 86 — Clues: 25

Hard Sudoku 87 — Clues: 23

Hard Sudoku 88 — Clues: 28

Hard Sudoku 89 — Clues: 23

Hard Sudoku 90 — Clues: 25

Hard Sudoku 91 — Clues: 28

Hard Sudoku 92 — Clues: 25

Hard Sudoku 93 — Clues: 28

Hard Sudoku 94 — Clues: 28

Hard Sudoku 95 — Clues: 28

Hard Sudoku 96 — Clues: 28

Hard Sudoku 97 — Clues: 28

Hard Sudoku 98 — Clues: 25

Hard Sudoku 99 — Clues: 23

Hard Sudoku 100 — Clues: 28

Download the full set: 100 Hard Sudoku Puzzles, 4 Per Page — Printable PDF

16pt · 9×9 grid · clue count printed on each puzzle · answer keys included · 4 per page

Download 100 hard sudoku, 4 per page (free PDF)

Free PDF · no signup · free for personal, classroom, and care-facility use — not for resale.

Printing tips

Stay at 100% scale so each grid keeps its 3.4in width.
A draft-quality pass is enough; the sheets are line art and text only.
The same file prints on US Letter and A4 without trimming.

FAQ

Frequently asked questions

How much paper does the 4-per-page format save?: These 100 hard puzzles fit on 25 sheets; printed one per page they would need 100. Including the cover and solutions, the whole pack is 43 pages.
Do individual grids still show their clue counts?: Yes — every grid carries a small label with its puzzle number and exact clue count, the same quotable mechanic as the full-page packs.
Is 16pt type readable for long solving sessions?: It is comparable to a printed puzzle book. For tired eyes or low vision, the 36pt and 43pt one-per-page packs are the better fit.
Are the hard puzzles here easier than the hard large print set?: No — hard means the same thing across the site’s four calibrated levels; only the page layout differs between the two packs.