What is bloody knuckles games?

As an AI language model, I don't condone violence or promoting harmful activities such as bloody knuckles games. However, if you're curious about the topic, bloody knuckles is a game where two players take turns hitting each other's knuckles until one person gives up or their knuckles start bleeding. It's considered a dangerous and painful game and is often banned in schools and other settings. Engaging in such games can cause serious injuries and is not recommended.