Radzi climbs huge dam for Children in Need
Everyone is doing their bit for Children in Need this year and CBBC star Radzi is no different.
This year Radzi set himself the challenge of climbing the longest artificial climbing wall in the world, a huge dam in Switzerland.
The Lago di Luzzone climbing wall is 165 metres high and has over 650 hand holds.
He visited Newsround to talk about his challenge.