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Interact."],"published-print":{"date-parts":[[2025,10,5]]},"abstract":"<jats:p>Despite the growing exploration of body games for social interaction, current approaches predominantly focus on physical mimicry while overlooking the critical emotional dimension of bodily expression. We address this gap by investigating emotion mimicry as a novel game mechanic for enhancing social presence and interpersonal connection. This paper introduces EmoEcho, a two-player 2D side-scrolling game that integrates emotion mimicry into its core mechanics. In EmoEcho, one player's facial expressions trigger game events while the second player must mimic these expressions to interact with game elements. Through a controlled comparative study (N=24, 12 pairs) contrasting emotion-based input against conventional keyboard controls, we demonstrate that emotion mimicry significantly enhanced social presence and overall game experience. Qualitative interviews further suggest that emotion mimicry enriched player experience via intriguing emotion-based embodied interaction, collaborative emotion co-creation, and development of shared emotional experiences. Our findings extend the understanding of social body games beyond physical mimicry to the emotional domain and provide actionable design implications for creating emotional social games. This work opens new space for game designers to leverage face-to-face emotional expressions as a powerful interface for creating meaningful social play experiences.<\/jats:p>","DOI":"10.1145\/3748605","type":"journal-article","created":{"date-parts":[[2025,10,5]],"date-time":"2025-10-05T21:01:11Z","timestamp":1759698071000},"page":"277-303","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["EmoEcho: Towards Understanding the Design of Emotion Mimicry in Digital Social Games"],"prefix":"10.1145","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5474-6949","authenticated-orcid":false,"given":"Zhuying","family":"Li","sequence":"first","affiliation":[{"name":"Southeast University, Nanjing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-9673-1485","authenticated-orcid":false,"given":"Jiaming","family":"Sun","sequence":"additional","affiliation":[{"name":"Southeast University, Nanjing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9240-8510","authenticated-orcid":false,"given":"Xiaolan","family":"Peng","sequence":"additional","affiliation":[{"name":"Institute of Software Chinese Academy of Sciences, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2025,10,5]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1145\/1054972.1055040"},{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","unstructured":"Van Baaren Rick B. 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