The Walnut Heist: Engineer Builds EPIC Backyard Squirrel Maze [Video] Last year, Mark Rober built a super complex squirrel maze leading to a treasure trove of nuts. This year, Mark kicked his old project up a notch with an even more complex maze. Check it out! [Mark Rober] Sharing is Caring:FacebookTwitterEmailMorePinterestMastodon Geeks are Sexy needs YOUR help. Learn more about how YOU can support us here.