any games that give you the feeling of going down a rabbithole? like, not necessarily an ARG or an outright conspiracy thriller like MGS but where your understanding of the game's world or story suddenly expands and your stomach sinks and butthole clenches because you get that sensation that something 'isnt right', especially in a creepy way
example would be like in Inscryption when it goes from Act 1 to Act 2 and when you find the ID in the wizard tower
or subnautica where you come across the island
to a lesser extent something like undertale/deltarune before the genocide/snowgrave routes were widely known and talked about openly