Sudozen (Sudoku 12x12) Solver

A Sudozen is a variation of Sudoku on a 12x12 grid (dozen = twelve). The basic rules of Sudoku still apply: each symbol must appear exactly once per row, per column, and per block. The blocks are not square; the most common configuration for a 12x12 grid is 3x4 (or 4x3) rectangular blocks.

If the grid has an irregular shape or a different format, use dCode's irregular sudoku solver.

Import the grid by copying and pasting or entering the values one by one (nothing or a space for blanks).

Use exactly 12 distinct symbols (Numbers or Letters accepted - wordoku variant). Common conventions are: 1..9 then A, B, C (or 0..9 then A, B). Do not enter 10, 11, or 12 as the grid does not accept two-character numbers; use unique symbols (e.g., A for 10, B for 11, C for 12) to ensure unambiguous entry.

The solver first applies logical techniques similar to those a human would use: analyzing rows, columns, and blocks to identify single cells, candidate pairs/triples, etc.

Each step is detailed to explain why a value is placed. If logical techniques are insufficient, the solver resorts to backtracking: choosing a candidate, propagating the consequences, and backtracking in case of contradiction. This approach is not random; it is a search that is first probabilistic and then systematic, allowing all options to be explored and the solution returned.

The solver calculates all the solutions and displays them if there are several (but all of them if there are too many), so if it only displays one then the solution is unique.