For those of you unfamiliar with the concept, Nethack is a "rougealike": the game is played entirely in text-mode (although there is a version with tiles available), the dungeons are generated randomly on each playthrough, and the game is ridiculously difficult.
Its the last bit that leads me to how Nethack is a microcosm of the modern world. When you begin, just about everything hates you. Your only friend is a loyal pet, and if you're not careful, they can turn on you, or worse, die on you. In the early game, just like a child, you are vulnerable. A single misstep to the "DYWYPI" (Do you want your possessions identified?) screen.
Like in the real world, when everything works together, its a sight to behold. That nice big meal means you can travel farther without having to scrounge for food, both in-game and out. If you're lucky (and skillful enough) to charm an enemy, they can quickly become a friend.
So, Nethack. For a game that uses glyphs, its more realistic than anything on the market today.