Sliding puzzle benchmark instances for automated heuristic design experiments (10×10, 20×20, 30×30)

Nine JSON files containing 900 sliding puzzle instances generated from solved 10×10, 20×20, and 30×30 boards with 100, 200, or 300 random blank moves and seeds 0–99. Each record includes the board, seed, scramble length, reversed generation moves, and misplaced-tile count. The archive preserves the original instance JSON files and README.md documents the format. The stored move must be negated for replay to the goal. The scramble length is not an optimal solution cost.