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Puzzle Quarry

Printable Calcudoku

Pick a side, a level and how many, and print. Boards go on one set of pages and the finished squares on another, so a sheet cannot spoil itself.

6 puzzles ready to print, each proved to have exactly one solution.

The puzzles

  • Puzzle 1 — 6×6 medium
    single cell, 4cage adding to 6single cell, 1cage with a difference of 2cage multiplying to 60
    cage adding to 12
    cage adding to 14single cell, 4single cell, 1
    cage multiplying to 10cage adding to 13cage adding to 7cage adding to 12
    cage adding to 10single cell, 6
    cage adding to 7
  • Puzzle 2 — 6×6 medium
    single cell, 6single cell, 1cage adding to 8cage adding to 12single cell, 2
    cage adding to 12cage with a quotient of 3
    cage adding to 15cage adding to 10
    cage adding to 12cage adding to 13cage adding to 8
    cage adding to 6single cell, 2cage adding to 11
  • Puzzle 3 — 6×6 medium
    cage adding to 11cage adding to 13cage adding to 4
    single cell, 6cage adding to 3single cell, 5
    cage adding to 9cage multiplying to 40cage adding to 11
    cage adding to 8cage adding to 7
    cage adding to 9single cell, 5cage adding to 11
    cage adding to 13
  • Puzzle 4 — 6×6 medium
    single cell, 6cage adding to 10cage adding to 10
    cage adding to 7cage adding to 12cage multiplying to 36
    single cell, 4cage with a quotient of 2
    cage with a difference of 1cage with a difference of 2cage multiplying to 10
    cage with a difference of 5cage adding to 5cage with a difference of 1cage multiplying to 5
    cage adding to 7
  • Puzzle 5 — 6×6 medium
    cage adding to 8cage with a difference of 4cage adding to 8cage adding to 13
    cage adding to 11single cell, 5
    cage adding to 4cage adding to 9cage multiplying to 20
    cage multiplying to 18cage multiplying to 10
    cage adding to 10cage adding to 10cage adding to 10
    single cell, 3
  • Puzzle 6 — 6×6 medium
    single cell, 1cage adding to 12cage with a quotient of 3cage adding to 10
    cage adding to 15cage adding to 9
    single cell, 3single cell, 4cage adding to 10
    cage adding to 9single cell, 4cage adding to 9cage adding to 6
    cage adding to 11cage multiplying to 20
    single cell, 5

The answers

  • Puzzle 1 — 6×6 medium (answer)
    single cell, 44cage adding to 62single cell, 11cage with a difference of 253cage multiplying to 606
    31cage adding to 126245
    cage adding to 14653single cell, 44single cell, 112
    cage multiplying to 105cage adding to 136cage adding to 7412cage adding to 123
    13cage adding to 102single cell, 6654
    2453cage adding to 761
  • Puzzle 2 — 6×6 medium (answer)
    single cell, 66single cell, 11cage adding to 834cage adding to 125single cell, 22
    cage adding to 1234cage with a quotient of 36125
    cage adding to 15452cage adding to 10316
    56cage adding to 1242cage adding to 133cage adding to 81
    cage adding to 61single cell, 22cage adding to 115643
    231564
  • Puzzle 3 — 6×6 medium (answer)
    cage adding to 1143cage adding to 13526cage adding to 41
    single cell, 664cage adding to 321single cell, 553
    cage adding to 91cage multiplying to 4054cage adding to 11632
    52cage adding to 834cage adding to 716
    3cage adding to 961single cell, 55cage adding to 1124
    21cage adding to 136345
  • Puzzle 4 — 6×6 medium (answer)
    single cell, 66cage adding to 1023cage adding to 10514
    cage adding to 715cage adding to 1246cage multiplying to 3632
    512single cell, 446cage with a quotient of 23
    cage with a difference of 13cage with a difference of 24cage multiplying to 105126
    26cage with a difference of 51cage adding to 53cage with a difference of 14cage multiplying to 55
    cage adding to 7436251
  • Puzzle 5 — 6×6 medium (answer)
    cage adding to 85cage with a difference of 426cage adding to 814cage adding to 133
    21cage adding to 1143single cell, 556
    cage adding to 43cage adding to 962cage multiplying to 20514
    1354cage multiplying to 186cage multiplying to 102
    cage adding to 106cage adding to 1041cage adding to 10235
    45single cell, 33621
  • Puzzle 6 — 6×6 medium (answer)
    single cell, 11cage adding to 1243cage with a quotient of 326cage adding to 105
    cage adding to 1545cage adding to 91623
    5single cell, 332single cell, 44cage adding to 1016
    6cage adding to 91single cell, 44cage adding to 953cage adding to 62
    cage adding to 113261cage multiplying to 2054
    26single cell, 55341

What lands on the paper

Six squares to a batch by default, two across a page, at a scale that leaves room to write four small candidate digits into a cell and still read the cage target in its corner. That corner number is the reason these print larger than a sudoku of the same side would: a cage cue crammed against a cell border is unreadable at the size most people print at.

The answers follow on their own pages rather than sitting beside the boards. A sheet carrying a puzzle and its solution within eye-shot is not a printable puzzle, it is a spoiler with extra steps, and it makes the sheet useless for handing to somebody else.

Nothing on the page is an image. Every board is drawn as a real table by the same renderer that draws the one you play on, so it comes out at whatever resolution the printer runs at and stays crisp instead of turning into a grey approximation. On paper the cage outlines go to solid black rather than the screen’s softer line, because a cage boundary that reads as a shade darker on a monitor disappears entirely in economy mode.

Picking a side and a level for paper

For a classroom or a waiting room, 4×4 easy is almost always right. It fits eight to a double-sided sheet, takes two or three minutes each, and needs nothing beyond copying the printed cages in and filling the last gap in each line — which can be explained in about a minute, or handed over as the technique page if you would rather not do the explaining.

For a long journey, 6×6 or 7×7 at medium is the sweet spot. Large enough to take real time, small enough that the arithmetic stays comfortably mental, and singles-level difficulty keeps a board moving without demanding a full grid of candidate marks in every cell.

Print hard and expert at 6×6 or larger. A 4×4 expert exists and is generated honestly, but sixteen cells do not give the cage-interaction argument much to work with, and the result tends to be one sharp moment surrounded by ordinary filling-in. This puzzle rewards space in the way a crossword does.

A printed square is proved like any other

Printed boards come from the same generator as the ones on screen and are held to the same standard: exactly one grid satisfies the cages, and it is reachable by argument at the level printed beside it. There is no second, sloppier path for paper.

That matters more on paper than anywhere else, because paper has no undo. A printed board with two answers wastes an afternoon and gives you no way to discover that the board was at fault rather than you — and on this puzzle, unlike most, the wrong answer will satisfy every cage you check.

Common questions

Are the printable calcudoku free?

Yes, every side and every level, with no cap on how many you print and no account to make. The answer pages are included unless you switch them off.

How large are the printed squares?

Two to a page at every side, laid out for A4 and US Letter without being scaled down to fit, which is what keeps the cells big enough for pencil marks and the cage cues legible.

Can I hand out the squares without the answers?

They are already split: the squares come first and the answers follow on pages of their own, so handing over the front sheets and keeping the back ones is all it takes.

More Calcudoku pages