Specification and evaluation of an assessment engine for educational games: Integrating learning analytics and providing an assessment authoring tool

•An innovative tool for assessment integration in educational games (EngAGe)•EngAGe is used by developers for guidelines on assessment and learning analytics.•EngAGe is used by educators to modify games and visualise learning analytics.•The engine’s usability and usefulness was evaluated quantitatively by 36 developers.•Findings confirm that EngAGe can be used effectively by educational games developers.