This passive robot by Nagoya Institute of Technology needs no power to walk. Instead, it prefers a slope so that the mechanism can work in harmony. It is using its own weight without any electrical or motor parts.
A push is what it needs to get it to walk. Strange that they design the legs to look like golf clubs. In a walking test, this robot walked 13 hours, taking 100,000 steps and going 15 km. And it has been listed in the Guinness World Record. Here is the video.
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(source)