There was this very short game, it was just one small puzzle where you were given a calculator and you were placed in front of a gate guarded by two huge trolls. It was designed to settle an argument about the influence of context in the rating of difficulty of a game.
It’s one of those games that have a single purpose, like 9 15 or byzantine perspective, quite memorable.
I might have read it in an article about difficulty of an if wiki, so I’ll look over there as well.
Thanks!