What is that game called where you have to get the guys hat because it floated up and you have to answer questions to get up to the hat on bbc?

The game you're referring to is likely "The Hat," which was featured in the BBC children's show "Blue Peter." In this game, players answer questions to progress and ultimately retrieve a character's hat that has floated away. It combines elements of trivia and adventure, engaging viewers in a fun and interactive way.