The recommended adult supervision level for a toy crane machine depends primarily on the child's age and the specific toy's design. For young children under 6 years old, direct and continuous adult supervision is essential. This is due to small parts, mechanical operation, and the need for guidance on safe use. For children aged 6 to 10, close adult supervision is recommended, meaning an adult should be actively present and attentive, ready to intervene if necessary. For older children and pre-teens, intermittent supervision may be sufficient, where an adult periodically checks on the play. Key factors influencing supervision include the toy's complexity, the presence of small detachable parts, the play environment, and the child's individual maturity and experience. Ultimately, the core principle is proactive engagement to prevent accidents, such as pinched fingers or misuse of parts, and to ensure the play experience remains fun and safe. Always prioritize the manufacturer's age guidelines and warnings on the toy packaging.