Jamiforme specimen
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Ordinal
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Unclassified
Catalogue record pending
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Jamdoku at a glance
Familiar logic. Far more freedom.
Jamdoku is a family of grid-based logic puzzles. If you know Sudoku, you already know the essential idea: each value appears once in every row, column and region (or “cob”). Jamdoku lets almost everything else change.
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More than one grid.
Explore distinct shapes, scales and structures rather than one permanently fixed layout.
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A fresh point of view.
Grids can turn or reorient, inviting you to see familiar relationships differently. A fresh perspective, not a penalty.
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Play one, or follow a chain.
Choose a single curiosity or a sequence shaped around the time you have available.
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Find the forms you enjoy.
Every grid has measurable structural character, allowing the catalogue to be compared, explored and curated.
One new word
Rows. Columns. Cobs.
Jamdoku calls the third family of groups : each cob contains every value once, just as every row and column does. A cob need not be a neat box.
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The Jamiforme Taxonomy
The catalogue itself
Pseudoku was only one form.
The familiar ordinal-nine grid occupies the centre of Plumridge’s taxonomy—not its boundary.
Across the wider catalogue, rows, columns and preserve their own uniqueness while shapes change, scale changes and new relationships emerge. The logic remains exact.
Fig. 12 — Reduction of the Klausüberwunder
From Plumridge’s notebooks
“Klaus paid dearly for the beauteous thirty-six-by-thirty-six tableau that bears his name: the pursuit of the Klausüberwunder cost him his reason.
I resolved, therefore, to halve the cob in each dimension—from six cells to three—thereby keeping my undertaking within the compass of my own sanity, and that of humankind. What emerged was smaller, yet no less beauteous: a regular schema of the ninth ordinal, which I named the Pseudo-K.U., in allusion to my lost friend’s fateful creation. In his honour, I enter it in the Jamiforme Taxonomy, numbering some two score schemata.
Thus was Pseudoku born.”
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Featured schema
Selected from the catalogue
A form worth examining.
Each featured schema is rendered directly from its canonical definition. Its four measures describe structural character—not difficulty—and are comparable across the catalogue.
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Ways to play
Choose an undertaking
Time well misspent.
A / Principal cabinet
Ambition Cabinet
Tell Jamdoku how much time you have. The cabinet assembles a varied sequence of compatible challenges intended to fit the interval—from a short wait to an hour’s journey.
20min
40min
60min
B / Daily cabinet
Pickle-du-Jour
A free daily selection: something fresh, curious and sufficiently preserved to await your attention.
C / Legacy cabinet
Sudo-ku-saurus
Pseudoku in its familiar nine-by-nine habitat, without disorientation and offered at a range of difficulties.
D / Graduated cabinet
Progression
A curated course that moves between easier and harder forms, allowing capability to grow through experiment rather than ordeal.
𓃭𓋹
𓆣
𓆣𓈖
𓋹𓅓𓂀
𓆣𓂀
𓇳𓅓𓆣
𓂀𓇳
Fifteen glyphs survive. Thirty-four absences. No surviving glyph repeats in any row or column.
The Plumridge papers
The puzzle has another history.
In the 1850s, Fitzwilliam L. Plumridge encountered a seven-by-seven tableau: fifteen hieroglyphs set among thirty-four absences. His attempt to restore it led from rows and columns to cobs, from collaboration to obsession, and finally to a taxonomy filed a century too late.
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The Cairo TableauAn absence becomes a problem.
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Too peculiarThe Society declines Plumridge’s first paper.
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The KlausüberwunderA manuscript burns; a mathematician disappears.
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The Jamiforme TaxonomySubmitted once. Opened one hundred years late.
Present-day notice
Jamdoku is in private testing for Android.
The catalogue is being opened deliberately. Release and store information will be published here when public play begins.