Mae'n riw serth iawn!
3 Ebrill 2017 Diweddarwyd 16:29 BST
People living on a road in New Zealand's Dunedin described this week what life is like on the "steepest residential street in the world".
At its steepest, Baldwin Street has a gradient of 35%, but Wales has some steep streets of its own.
Swansea's Constitution Hill, which features in the 1990s film Twin Town, has a gradient of 20%.