Specification and evaluation of an assessment engine for educational games: Empowering educators with an assessment editor and a learning analytics dashboard.

•Evaluation of an innovative tool for assessment in educational games (EngAGe)•Used by developers to build assessment and learning analytics into games.•Used by educators to modify educational games and visualise learning analytics.•The engine’s usability and usefulness was positively evaluated by 31 educators.•Findings suggest that EngAGe increases educators’ trust towards a game’s assessment.