This study seeks to understand how children express themselves socially and emotionally in play negotiations in early childhood education and care (ECEC) settings. It addresses the following research questions: What strategies do children employ in play negotiations? How do these strategies manifest themselves socially and emotionally? The study was conducted in eight ECEC centers and one preschool located in Swedish-speaking regions of Finland. The target group consisted of children aged 3-6. Data were collected through video observations that captured children's social interactions and engagement with their peers during free play. A multimodal interaction analysis approach was employed to identify a prominent category termed "exclusion", which refers to how children employ strategies (e.g., fantasy and fiction) to limit the participation of other children in play negotiations. The results of this study contribute to our understanding of children's complex play negotiations and highlight the significance of addressing their social and emotional development in these contexts.