In chapter 23, what does Wade have to do to complete the text adventure game Zork?

Ernest Cline's novel, Ready Player One, gained popularity this year due to the release of the film version directed by Steven Spielberg. The novel takes place in the year 2044, partially in a real world and partially in an alternate worldwide virtual reality game called the "Oasis." The purpose of the game is to find an Easter egg in order to win the fortune of the man who created the game, James Halliday. To find this egg, three keys must be found.
Wade Watts is in a race against an avatar named Art3mis and two Japanese gunters. Gunters are "egg-hunters." Wade also has the help of his virtual friend, Aech, who is also hunting for the keys.
In chapter 23, Wade Watts, who goes by the name Parzival while in the Oasis, must compete in a text adventure game, Zork, in order to find the second key, the jade key. This chapter starts out with Wade or his avatar, Parzival, having to teleport from the planet Frobozz. Wade has already found the first key, which was hidden in the same virtual reality as his own high school. Wade had played this game in an original format previously and could easily beat the game by using the clues he had written down in a special notebook.
While playing the game that takes place in Halliday's childhood home, Wade must collect a variety of trophies and place these in a trophy case in a house. Wade must also battle a troll, a cyclops, and a thief. After these obstacles have been cleared, Wade is able to look in a Cap'n Crunch cereal box and finds a whistle. When Wade blows the whistle, he discovers that it is really a foil-wrapped key that delivers to him the next riddle he must solve to find the third key.

In Ready Player One by Ernest Cline, Wade, known as Parzival in the OASIS, must solve a series of games and puzzles in an attempt to collect three keys. To obtain the jade key, which is the second key, he must complete the game Zork. Fortunately for Wade, he played the game previously in its original text adventure format, which requires the player to enter simple commands. While he played, he took notes in what he refers to as his "grail diary." These notes allow Wade to successfully maneuver in the game.
The game begins outside an old white house. Wade must collect a series of nineteen different "trophies" which must then be placed inside a trophy case located in the house. Along the way, he must battle "a troll, a Cyclops, and a really annoying thief." Once this is accomplished, Wade must then blow a whistle found inside a box of Cap'n Crunch cereal. After receiving the key, he is able to move on to the next adventure.