Ultimate Cube: variants and edges in 3D
The Ultimate Cube: six variants linked by their edges
The Ultimate Cube brings the other two cubes together: the six variants of the Variant Cube, in the same places, on a cube with shared edges like the Classic Cube. Each face has its own rule (Sudoku X, Hyper, even-odd, jigsaw, greater than, Killer), and a border cell belongs to two faces, so to two rules at once.
On the border between the even-odd face and the Killer face, for example, a digit must have the right parity and fit the sum of its cage. The Killer and greater than faces start with few digits, or none at all: their edges fill in as you make progress on their neighbours. A face filled in without errors turns gold; six gold faces, and the cube is won.
A tip if you have never played the variants: get to know them first, one at a time, on the site's variant pages. There, their 💡 Hint button opens a step-by-step guide that explains every deduction specific to the variant, whereas in the cube a hint only reveals a digit. Without that groundwork, the Ultimate Cube may prove very hard.
It is the most demanding of the three cubes: plan for a long game, autosave will keep it for you. Sudoku-Land offers it in 3 levels (easy, medium, hard), with 100 different cubes per level: the game first gives you a cube you have never started. You get notes mode, six hints for the whole cube, a dark theme and the ⚙️ Settings menu. Every cube has a single solution and can be solved by logic alone, without ever guessing. The other two cubes are on the three sudoku cubes page.
Ultimate Cube rules
- Each face has its variant — Sudoku X on face 1, Hyper Sudoku on face 2, even-odd on face 3, jigsaw on face 4, greater than on the top and Killer on the bottom. The rule of the flat face is shown above the number pad.
- The edges are shared — a cell on the border of a face is also on the border of the neighbouring face: its digit shows on both faces and must follow both rules. A corner cell belongs to three faces.
- One face alone is not enough — you fill in its edges by making progress on its neighbours; the Killer and greater than faces start with few digits, or none at all.
- Six gold faces, cube won — a face filled in without errors turns gold and locks, along with the cells it shares with its neighbours.
Tips for solving the Ultimate Cube
- Start with the fullest faces — then use their edges to tackle the almost empty faces, like the Killer and the greater than.
- Think of both rules on border cells — on an edge, a digit must suit both faces: the parity on one side can decide between two cage combinations on the other.
- When a face gets stuck, move to its neighbour — the arrows on the edges of the flat face, or Shift + arrow on the keyboard, bring up the face next to it.
- Pencil in candidates — with notes mode (Space, right-click or long press), or with the auto notes of the face in play, which you can turn on in the ⚙️ Settings menu: they follow its variant and the cells shared with the neighbouring faces.
Other cubes and puzzles
Frequently asked questions
What is the Ultimate Cube?
It is the most demanding of Sudoku-Land's three sudoku cubes: six 9×9 grids on the faces of a 3D cube, each with its own variant (X, Hyper, even-odd, jigsaw, greater than, Killer), and faces linked by their edges. The cube is won when all six faces are filled in.
What happens on an edge cell?
It belongs to two faces, so to two variants: the digit you place there must follow both rules at once. On the border between the even-odd face and the Killer face, it must have the right parity and fit the sum of its cage. A corner cell even follows three rules.
Which cube should you start with?
If the variants are new to you, start with their puzzles on Sudoku-Land, one at a time: there, the Hint button explains each deduction step by step. Then move on to the Variant Cube, where each face can be solved on its own, and to the Classic Cube for shared edges. The Ultimate Cube combines the two: it is best enjoyed once you have mastered the other two.
How many cubes are there?
100 different cubes per level, 300 in all. The game first gives you a cube you have never started on your device; once you have started them all, the list starts over.
How many hints do you get per cube?
Six for the whole cube, to use on the face of your choice. A hint reveals the digit of the selected cell. Auto notes, which you can turn on in the Settings menu, also cost a hint when you choose “Cleaned candidates”; “All candidates” stays free.