Play is an essential part of a child’s life from infancy. 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 activities, children can practice and strengthen critical 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, created with support from the LEGO Foundation, provides suggestions for games and play-based activities based on a child’s age. These activities are designed for adults to engage in with children.