And if that's not good enough, there's the one whose game basically opens with 'Losing is fun!': http://dwarffortresswiki.org/index.php/DF2014:Losing
Reach a point where all core problems are solved, and then create your own problems (and try to solve them).
Its just DF community that claimed it as their mantra, and their primary marketing of the game. But all sim games (d)evolve to this.
Kinda like Lucky Strike's "it's toasted!" slogan
Although I understand Souls doesn't have permadeath, therefore it's probably only half the fun of Nethack.
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But Original DnD is where my inspiration-knowledge stops