Classic
Original rules of the base game.
Logic / 20 modes
Sudoku
Nine digits. Clear logic. Discover the unique solution.
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One game. Several approaches.
Diagonals
Digits must also be distinct on both long diagonals.
Hyper regions
Four extra 3×3 windows also contain digits 1–9 without repetition.
Killer sums
Digits in each marked cage are distinct and add to its displayed sum.
Odd / even
O permits only odd digits; E permits only even digits.
Jigsaw
Nine connected regions R1–R9 replace the 3×3 boxes; each contains digits 1–9 without repeats.
Thermometers
Digits strictly increase along each T path, from position 1 to its end.
Arrows
The digit in AΣ equals the sum along its corresponding A path.
Kropki
○ means a difference of 1; ● means a 1:2 ratio. Missing markers impose no restriction.
V / X sums
V between neighbors means a sum of 5; X means a sum of 10. Unmarked neighbors are unrestricted.
Anti-knight
Equal digits cannot be a chess knight move apart.
Anti-king
Equal digits cannot touch diagonally, including across box boundaries.
Sandwich
Exterior row and column clues sum the digits strictly between 1 and 9, excluding 1 and 9 themselves.
Palindromes
Digits along each P path read the same from both ends.
Renban
Each R path contains distinct consecutive digits in any order.
German whispers
Adjacent digits along each W path differ by at least 5.
Twin grids
Two 9×9 grids share a box. Each shared cell participates in both grids simultaneously.
Samurai
Five 9×9 grids share boxes with the center grid. Shared cells are outlined.
Linked faces
Three unfolded planes: the first shares a row with the second and a column with the third. Shared values must satisfy every adjoining grid.
Deductive fog
Some corner clues are hidden. Correct digits reveal cells within two orthogonal steps. Generation verifies progress using visible clues only; undo does not hide revealed information.