9 Million Sudoku Puzzles and Solutions

### Context
Classic Sudoku is the basic type of sudoku which requires you to fill in the digits 1-9 such that every digit appears exactly once in each row, column and 3x3 box. Each sudoku has a single unique solution.

### Content
Each row represents a sudoku puzzle and it's corresponding solution. The order of digits is left-to-right and top-to-bottom with 0's representing blank cells in the puzzle.

### Inspiration
Having created hand-crafted sudokus and its variants over the years, it would be interesting to see machine learning applications on analyzing, summarizing and solving sudokus.

### Why 9?
Sudoku is all about digits 1-9 and hence the dataset is themed on 9 with 9 million puzzles.

{'Context': '经典数独游戏为 Sudoku 的基本类型，玩家需填充数字 1-9，确保每行、每列及 3x3 宫格内每个数字仅出现一次。每个数独问题均具有唯一解。', 'Content': '每行代表一个数独谜题及其对应的解答。数字的排列顺序遵循从左至右、从上至下的原则，其中 0 表示谜题中的空白单元格。', 'Inspiration': '多年来，本人亲手制作了众多数独及其变体，因此观察机器学习在数独分析、总结及求解方面的应用将颇具趣味。', 'Why 9': '数独游戏的核心在于数字 1-9，因此本数据集以 9 为主题，包含 900 万个谜题。'}