JK Rowling has given Potter fans a sneaky glimpse of the sixth book - but they had to work hard for it!
JK led users of her website a merry dance by making them first play a game of online darts. If they did well enough, a safe was revealed.
If they cracked the code, the safe opened and there was a passage from Harry Potter and the Half-Blood Prince.
Several newspapers are carrying reports of the stunt, but the passage has now vanished from JK's site.