You play a different role in each of the three parts of the game.
This is the only Infocom title to utilize a real-time clock, which means that time passes and things happen even as the player thinks about what to do next.
[+] Users who have solved this game
[+] Users currently playing this game
I quite enjoyed the real-time gameplay, where things happen even if you don't make any moves. Also, the phrasebook supplied with the game is hilarious.