After retirement, Qin Xiaosi sought entertainment activities to enrich his life. He came upon a traditional Chinese toy called Klotski, a sliding block puzzle that uses long-term strategies to move a specific block to a predetermined position. 

Let's see how these 10 blocks changed a 78-year-old's life.

Scriptwriter: Shi Chan

Video editor: Shi Chan

Camera: Liu Hangjian, Shi Chan

Cover photo designer: Jia Jieqiong

Chief editor: Qin Xiaohu

Producer: Li Tianfu

Executive producer: Wen Yaru

Supervisor: Zhang Shilei