Not nethack, I was talking about a hypothetical clone of nethack where you can supposedly make a whole run without "surprises" that can randomly kill you, like floating eyes (or Jelly monsters in brogue). I think such a game would be very enjoyable first few times you play, but then since not challenging would be boring. Entirely different genre but Universal Paperclip might be a good example, extremely interesting story but the game is almost too easy after you learn to reliably win it. I think nethack is "boredom proof" because it's so challenging. I must be honest, I never finished brogue nor nethack (but I suck at video games because I play them once a year or so) but every game still gives the same rush of enjoyment every time. Still, though I don't keep playing it because the "demotivation" thing I was talking about earlier stops me from starting a new game (I'll lose anyway).