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3.
An ASCII "hack and slash" based game, of the genre "dungeon crawler". "Hack and slash" denotes oen of the game's requirements: Killing things (monsters, in this case) until you level up enough to continue.

The primary goal of this game is to retrieve the "amulet of Yendor" for your character's god, and after retrieving it (from the deepest level of an extremely large dungeon), carrying it all the way back up and through 5 planes.

The game has multiple thousand references to fantasy books and games, such as "Hack", another "hack and slash game", Lord of the Rings (a fantasy series by J.R.R Tolkein), and Dungeons and Dragons.

Many game completions ("ascensions") require over 12 hours of gameplay, and Nethack is known as one of the most difficult to beat games of all time.
Dave: "Dude! While you were out partying all weekend, I beat Nethack!"
Dude: "Oh my gosh, I've tried for years and have never been able to beat that game!"
by Xenarian September 05, 2009
 
1.
I)A highly detailed roguelike game with an almost infinite replayability factor, usually played by intelligent people(because morons would turn it down because of it's bad grafiks).

I)The best game ever made.
I've finally reached level 12 on Nethack! Sp00n4g3! 0wn4g3!
by HolsteinCow May 04, 2003
 
2.
a) AscII based rpg game.

b) One of the greatest rpg games ever made. Was in development for 15 years.

c) "Roguelike" game, meaning it is based on a very old ascII based game called rogue. This game launched it's own sub-genre.

d) Legendary game played by intelligent and clever people; will be dismissed and not enjoyed by casual gamers because of lack of sound and graphics.
Me: My level 15 knight was slain by an elf! Damn you nethack! Oh well, let's try samurai this time.
by Ballistyx May 07, 2005