But also, lists like that also implicitly often are euphemisms for “titles that are good, but cater to non-mainstream interests, and so never achieve vitality.” Hidden-object games get (probably unfairly and mostly self-perpetuatingly) classified as “girly games” — which leads to major game reviewers and journalists just completely ignoring them when they come out. So a good hidden-object game will almost always, inherently be a “hidden gem.”
Some games are so good that you may want to play them even if you're not the biggest fan of their genre. I guarantee you plenty of people played Undertale without being big JRPG fans.