metadata

task_categories:
  - question-answering

Hardest Sudoku Puzzle Dataset V2

This dataset contains a mixture of easy and very hard Sudoku puzzles collected from the Sudoku community.

Dataset Composition

Sources

Easy Puzzles (1.1M)

puzzles0_kaggle
puzzles1_unbiased
puzzles2_17_clue

Hard Puzzles (3.1M)

puzzles3_magictour_top1465
puzzles4_forum_hardest_1905
puzzles6_forum_hardest_1106
ph_2010/01_file1.txt

Dataset Characteristics

All puzzles have been exact-deduped and randomly permuted by row, column, box, and digit.
Each puzzle is guaranteed to have a unique solution.
Puzzles in the train set are mathematically inequivalent to those in the test set.

Dataset Structure

Train set: train.csv (3.8M examples)
Test set: test.csv (423k examples)

Puzzles and solutions are flattened in row-major order. Rating is evaluated by number of backtracks needed by tdoku solver required to solve the puzzle (higher is harder).

Usage Guidelines

Train models using only the train set.
Evaluate models on the test set using exact accuracy (all numbers must be correct).