NetHack is the oldest game I still play and probably the deepest. Released in 1987, still actively developed, still capable of killing you in ways you did not anticipate after hundreds of hours of play. There is nothing else quite like it.
What NetHack Is
It is a dungeon-crawling roguelike — ASCII graphics, procedurally generated levels, permanent death. You descend through levels of a dungeon searching for the Amulet of Yendor. You will die. You will die in embarrassing ways. You will learn from each death and die again differently.
The game is legendarily complex. Items are not identified on first encounter — you find potions and scrolls with names like “bubbly potion” and must determine through experiment or deduction what they actually do. Drinking an unidentified potion might restore your health or polymorph you into a monster. The learning curve is not a curve; it is a wall.
Why It Matters
NetHack is a game that rewards systematic thinking, careful observation, and the willingness to treat failure as information rather than punishment. The game remembers everything. The dungeon contains consistent rules that can be learned. Random elements exist but are bounded by a system that can be understood.
It is the closest thing I know in game form to the actual experience of learning a complex system from first principles. The satisfaction of finally understanding how a mechanism works — the food clock, the encumbrance system, the prayer mechanic — is real and hard-won. I commend it to anyone who wants a game that takes them seriously.