From infancy on, play is an important part of a child’s life. For babies and toddlers, simple, playful interactions with adults help develop sturdy brain architecture, the foundations of lifelong health, and the building blocks of resilience. Through games and playful activities, children can practice and strengthen important executive function skills that will help them throughout their lives, including learning to focus their attention, strengthening their working memory, and developing basic self-control. The following handout series, developed with support from the LEGO Foundation, provides suggestions for games and play-based activities based on a child’s age. The activities for younger children are designed for adults to engage in with children. Activities for later ages allow the adults to step back, enabling children’s independence to blossom as they transition to playing more often with peers.