FremantleMedia Kids and Family Entertainment's Danger Mouse was projected onto the side of the BBC in Hull last week, where kids had to help the secret agent escape.
The game was part of CBBC Live and Digital, which is a weekend of events, live shows and digital activity in the city.
Children had to use codes to help Danger Mouse make his way across 24 metres of the building, where he had to avoid evil characters and get to the top in time to escape with his jet pack.
Meanwhile, the bunny Mim-Mim from pre-school show Kate and Mim-Mim and superhero Tree Fu Tom are heading across the Severn Bridge to Cardiff, where the two characters will be entertaining the crowds gathering for the CBeebies annual Christmas panto next weekend.
Tessa Moore, SVP of global brands at FremantleMedia Kids & Family Entertainment, said: “We are delighted that our hugely popular characters are out interacting with their many fans at such high-profile Children’s BBC events.”
The new series of Danger Mouse launched on CBBC in September and features the likes of Alexander Armstrong as Danger Mouse and Kevin Eldon as Penfold.