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README.md

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+---
+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
+
+- [tdoku benchmarks](https://github.com/t-dillon/tdoku/blob/master/benchmarks/README.md#benchmarked-data-sets)
+- [enjoysudoku](http://forum.enjoysudoku.com/the-hardest-sudokus-new-thread-t6539-600.html#p277835)
+
+### 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](http://sudopedia.enjoysudoku.com/Mathematically_equivalent.html) 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]((https://github.com/t-dillon/tdoku) required to solve the puzzle (higher is harder).
+
+## Usage Guidelines
+
+1. Train models using only the train set.
+2. Evaluate models on the test set using exact accuracy (all numbers must be correct).