League of Legends dataset of 320M matches and 26M unique users

This dataset contains processed and anonymized records from 321,146,032 chronologically ordered 5-versus-5 League of Legends matches involving 26,093,819 unique players. It includes patch identifiers, champion selections, match outcomes, dataset-internal player indices, and scripts for reconstructing player match histories. The dataset supports research on player proficiency, team composition, role–champion assignments, and match outcomes. Original player and match identifiers have been removed. See the included README file for the complete schema and preparation instructions.