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Continue playing

A new version of Soodokoo is ready.

Choose your puzzle

Daily puzzle

Puzzle setup 3

Dimensions

2D 3D 4D 5D 6D

3D

Five layers.

The rows and columns continue through the stack.

Numbers

Difficulty

3D puzzle

More ···

Playing time 00:00

Layer changes keep the selected row and column in place.

Enter a number

One of each, in every direction.

Board view

Change board axes

Choose two dimensions for the board. The others become sliders. Your selected cell stays the same.

Hints & checks

Optional puzzle aids

This is a daily puzzle, so there is no answer to check against. Hints and fills stay available; using them ranks your result with other assisted solves.

Each line passes through your selected cell in a different dimension.

Aids for large boards

These use only your entries, never the answers. Undo reverses each one in a single step.

When I enter a number, remove it from pencil marks along its lines

Saved puzzles

Pick up any puzzle where you left off. Entries, pencil marks, and undo history stay with each attempt.

Puzzle details

Difficulty describes the techniques used to solve the starting puzzle. Every rated puzzle has a complete logical solution without guessing. Navigation is separate from the rating.

Ratings are an initial guide; we’re still calibrating how they feel to players. Earlier saved puzzles remain unrated.

Keyboard shortcuts

1–9: Enter a number or pencil mark
Arrow keys: Move between cells
N: Toggle pencil marks
Delete: Erase the selected cell
Page Up / Down: Change layer
Shift + Page Up / Down: Change world
Ctrl / ⌘ + Z: Undo
Ctrl / ⌘ + Shift + Z: Redo
Esc: Close a menu or dialog

Settings

Share anonymous solve times

When this is on, finishing or starting a puzzle sends its ID, your time, how many hints, fills and checks you used, and a random ID for this device. It never sends your entries. It helps us calibrate difficulty, and it is off unless you turn it on.

Finishing a daily puzzle sends your completed grid and time, so the server can check it and show how you compare. The same random ID counts one result per device.

Device ID

This copy of Soodokoo runs entirely on this device. Nothing is sent anywhere.

How to play

Each number belongs once in every line, along every dimension.

In 2D, solve the rows and columns on a single board. There are no Sudoku boxes.

In 3D, those rules extend through a stack of boards. Move the Layer slider to compare cells at the same row and column.

In 4D, a World contains a stack of layers. Change worlds to follow another direction through the puzzle.

In 5D, a third slider connects sets of worlds. All five directions follow the same rule.

Select an empty cell and enter a number. Use Pencil to add your own notes. The game doesn't add notes or flag mistakes automatically.

You can request a hint or check under More. Your puzzles save separately in this browser. Undo and Redo survive reloads for the most recent 2,000 edits in each attempt.