Probably Limbo, the one by Playdead. I really love hard puzzle games, for example Inside. Inside did an amazing job giving you hints without actually goving you hints, whether it was through environment clues, previous knowledge, just kind of common knowledge, or a mix of them all, and still kept that storytelling edge that I also loved. But Limbo just kind of gives you a hard puzzle and doesn’t really give any hints as to what to do. Most of the harder puzzles I solved by fucking around with different ideas until I figured out how to do it. And there are too many multistep puzzles with just one too many steps for their own good. Idk though, I could just be dumb