what means "hydra seek"?

Answer 1

I am not sure what you are asking. If I may, I think you are asking about "Hide And Seek"? It is a children's game [ played by adults at times] One person [It] covers their eyes and counts [usually to 100 ] The others hide . The person who counted tries to find the hidden ones, if he can find them and touch them [ tag them ] then they become "it" and the whole thing starts again.

When adults play it, it can have sexual elements!

All in All a fun game.