Free for teaching
Sudoku, Calcudoku, Colodoku: explore the rules, boards and tools to play at your own pace.
A single engine solves and builds every grid, and it knows nothing of a row or a column: it is given groups of cells that must all differ. Changing the mode means changing what a cell contains.
A cell holds a digit — a letter beyond nine cells a side — or whatever you type yourself: letters, syllables, words. All the deduction comes from the groups: rows, columns, regions… and, on the other boards, three-direction rows or zones. It is played on all five shapes, from 2×2 to 26×26.
The grid is cut into cages that each announce a calculation: 20+, 32×, 3−, 3:. No blocks, ever. You choose the operations — addition alone, then + −, + − ×, all four — as well as the numbers, the fractions and the cage size, independently of the sudoku difficulty.
A cell holds a colour, a cage announces a colour, and the only operation is mixing. CMY — black target, like ink — or RGB — white target, like light: a complete row makes exactly the target. From three to eight colours.
Experimental — in development
A cage is no longer a sum but a recipe: place the right pieces and they compose the thing asked for. Science — Chemdoku, Phydoku, Biodoku, Astrodoku. Kids — Pictoku, Whodoku and Geodoku, playable before knowing how to count.
The sixteen themed sets are experimental — in development. That forbids nothing, everything can be played. It only means that these sets are not locked yet: pieces and recipes may still change, and a grid started today may not replay identically tomorrow. Sudoku, Calcudoku and Colodoku are stable.
Changing the shape means declaring other groups to the engine. That is why a hexagon, a triangle or a completely irregular tiling are not three different games — and why, when in doubt, you only need to touch a cell: everything linked to it lights up.
From a four-cell toy to a 676-cell marathon. Blocks follow the size — 2×3 at 6×6, 4×4 at 16×16; a prime side gives a Latin square. Beyond nine, Sudoku switches to letters.
19, 37 or 61 cells, and lines in three directions — no regions at all, because those numbers are prime. A Latin square with three families of lines.
The densest board in the game: regions of nine triangles, rows in three directions, and two triangles that touch always carry different symbols. Colodoku, for its part, plays on the Latin triangle, side 5 to 7.
A triangle where some rosettes of six cells melt into a hexagon — the most constrained cell on the board. Regular layout, or a “Surprise” one drawn from the seed.
No hidden lattice: the tiling is drawn from the seed, and no two games ever share a board. Families of zones replace rows and columns; square, hexagonal, octagonal or triangular outline.
The grids overlap on a single board, each with its own coloured frame. Samurai, butterfly, windmill… rather than a catalogue, the layout is drawn from the seed: every game is a new map, and resuming rebuilds exactly the same one.
Extra all-different groups, shaded on the board: there too, never the same value twice. Diagonals, windows, block centres, asterisk, girandola — the pattern is drawn at random for every game.
The pencil, the torch and the colours know nothing: they tidy your reasoning, they don't do it for you. The light bulb does know the answer — and says only as much of it as you ask for.
To discover the game, prepare to use it in class or discuss a project, talk with Jacques Lovi.
When booking, mention InZeDoku and the purpose of your meeting.
