The Z-code file for the text adventure is here. For best results, you probably want to download a client; we recommend:
If you're just having a taste, or if those clients don't seem to work for you, you can try this applet. Be warned, however, that it's a little less pleasant to use, and we've had issues with it properly displaying text at startup.
Those of you not downloading the meta may wish to start on Round 1:
Amethyst
Diamond
Emerald
Ivory
Jade
Obsidian
Ruby
Sapphire
Here is a puzzle list of all puzzles from both rounds. Please note, though, that if you want to solve the entire Hunt as presented to teams, you should not look at the puzzle list page - part of text adventure involves finding the Round 2 puzzles.
Here is information about the runaround which teams were sent on after completing the game.