Kev and Ros were joined by Hollywood star Warwick Davis.
He's famed for appearing in Star Wars and Harry Potter - and did we mention he also lives in Peterborough?
Warwick's appearing in panto this Christmas but we would only let him promote it if he got a high enough score on our new game...
It's Behind You!
Ros rubbed a whole variety of objects against Warwick's back… but was he be able to work out what each object was?
Kev and Ros also re-enacted a famous Harry Potter moment with Warwick – who played Professor Flitwick and Griphook (a goblin in Gringotts Bank).