We just bought a new cat tree about a week ago and Oscar is kinding warming up to in a sense that he will play around and sit on the second shelf. But he wont go any higher than that. It has another step up that is a round shelf with a hole in it to crawl up to get to it. Is there anyway to I guess get him up there. I've triend using treats and things like that and he will go up there for those but wont go up to the top any other time. Any help would be appreciated.