Group building games that don't require props

Hide and seek.

The origin of hide-and-seek:

Hide-and-seek, also known as "hide and seek", is a traditional game in China. It uses a towel to wrap the eyes, which makes each other elusive. Another person closes their eyes and looks at others in a designated area. The person who is not found and returns to the starting point without being spotted by the searcher will not participate in the second round of guessing and will become the hider. The game can be repeated.