A few nominees:
You could list any good chess games as difficult. Ask Gary Kasparov how hard it can be.
I've always thought the Myst series was way too hard.
"Rogue" is arguably one of the hardest, you can play for years and not win the amulet.
Finishing arcade games like Pac Man or Donkey Kong is crazy hard as shown in the documentary 'King of Kong'.
A puzzle game called "Heaven and Earth" got really hard with puzzales that are not cheap, just hard. I've never met anyone online who had played it though.
I'd think it's better to consider genres for this topic, like adventures and RTS and MMO's.
You could list any good chess games as difficult. Ask Gary Kasparov how hard it can be.
I've always thought the Myst series was way too hard.
"Rogue" is arguably one of the hardest, you can play for years and not win the amulet.
Finishing arcade games like Pac Man or Donkey Kong is crazy hard as shown in the documentary 'King of Kong'.
A puzzle game called "Heaven and Earth" got really hard with puzzales that are not cheap, just hard. I've never met anyone online who had played it though.
I'd think it's better to consider genres for this topic, like adventures and RTS and MMO's.