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The dataset contains difficulty ratings of Sudoku puzzles experienced by human players, intended for evaluating Sudoku difficulty‑rating algorithms. It is built from human gameplay time and success rate, providing two difficulty metrics: $D_{TO}$ (time‑only) and $D_{TR}$ (time and completion rate).

This dataset consists of Sudoku images captured with smartphone cameras from various newspapers. It includes 200 Sudoku pictures, divided into a training set of 160 images and a test set of 40 images.