Reusable Hangman - Spell It Or He'll Swing!
Magical toy for playing Hangman; one of Weasleys’ Wizard Wheezes (HBP6)
A toy for playing Hangman - not on paper, but with a tiny wooden man and a real set of gallows to scale, where apparently the little man will march up the gallows steps as the game progresses.
The game Hangman is also called Gallows. Its origins are unknown, but it was mentioned in a book on games in the Victorian era, according to Wikipedia.
The fact that it's reusable is stressed in this version of Hangman.