This two-volume set LNCS 12789 and 12790 constitutes the refereed proceedings of the Third International Conference on HCI in Games, HCI-Games 2021, held as part of the 23rd International Conference, HCI International 2021, which took place in July 2021.

Toward a Theory-Driven Model of Emotional Interaction Design in Mobile Games Research.- A Specific Measurable Model - How Can Test Results be Influenced by Interactive Prototypes and Design Manuscripts? .- HEROES: an Action Game enabling Players With and Without Disabilities to Play Together.- Gaze as a Navigation and Control Mechanism in Third-Person Shooter Video Games.- Foresthlon: Investigating Gender Experience through a Hybrid BCI Game.- Research on User Experience Optimization for Tutorial Design of Battle Royale Games Based on Grey AHP Theory.- Horror Ludens: Using Fear to Construct Meaning in Video Games.- Persuasive Technology in Games: A Brief Review and Reappraisa.- Analyzing and Prioritizing Usability Issues in Games.- The Design of Buttons in MMO Mobile Game's Battle Interface.- esearch on the Quantization of User Experience of Spectator Mode in Moba Games.- Computer-Aided Games-Based Learning for Children with Autism.- Analysis of the Competitiveness of Asymmetric Gamesin the Market.- A Systematic Review of the Effect of Gamification on Adherence across Disciplines.- An Exploration of the Fear of Attack Strategy in Chess and its Influence on Class-A Players of Different Chess Personalities: An Exploration Using Virtual Humans.- The Factorial Structure and Underlying Contributors of Parents’ Behavioral Involvement in Children’s Video Game Use.- In-Game Virtual Consumption and Online Video Game Addiction: A Conceptual Model.- Player Types and Game Element Preferences: Investigating the Relationship with the Gamification User Types HEXAD Scale.- The Foundations and Frontiers of Research on the Effect of Video Games on Child Development: A Scientometrics and Knowledge-Mapping Analysis Based on CiteSpace.- Using Neural-Network-Driven Image Recognition Software to Detect Emotional Reactions in the Face of a Player while Playing a Horror Video Game.- Exploratory and Confirmatory Factor Analysis of the Chinese Young Children’s Video-gaming Questionnaire.- Using Multiple Data Streams in Executive Function Training Games to Optimize Outcomes for Neurodiverse Populations.- Gameplay as Network: Understanding the Consequences of Automation on Play and Use.- Hitboxes: A Survey about Collision Detection in Video Games.- Adaptive Gamification and its Impact on Performance.- Designing Interactive Storytelling Games to Teach Computational Thinking.- In-Game Advertising: Brand Integration and Player Involvement as Key Influencing Factors on Brand Recall.- Detecting Real-Time Correlated Simultaneous Events in Microblogs: The case of Men's Olympic Football.- UNITY-Things: An Internet-of-Things Software Framework Integrating Arduino-Enabled Remote Devices with the UNITY Game Engine.- The Effects of Vibration on Assisting Game Play and Improving Player Engagement when Lacking Sound.- Investigating the Impact of Task Significance on Task Engagement and Enjoyment in Digital Games.

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