The original text back to life Legends o f Zork

Here's one for the Wikigamers (the fearless gamesblog readers who boldly created our own Spaceship! game last year) - and anyone else who loves text adventures: the classic, epic Zork has been transformed into Legends of Zork, a browser-based adventure game inspired by the original classic. For those who've played through Spaceship!, you may recognise at least a few nods in the direction of this game.

And it is pretty true. One piece of advice: beware the evil grues.
More of this ilk for fun and free is the majestic Kingdom of Loathing.

Source : www.guardian.co.uk/technology/gamesblog/2009/apr/09/legends-of-zork-text-adventure-wikigame-spaceship-gamesblog-king