Zork

Zork is a text-based adventure game based on the from 1979 and can be played on the computer terminal in Call of Duty: Black Ops and Call of Duty: Black Ops Cold War by typing zork into the blank text prompt. It was also prominently featured in the Pawn Takes Pawn ARG.
==Gameplay==
Being a text-based adventure game, Zork contains no graphics and only text to describe what happens. This can prove to be difficult in times of little description.
===Zork commands===
After starting the in-game text-based retro-game Zork, either through entering zork or hello sailor, these are the commands a player can type into the computer terminal's console to play the game. This is not an exhaustive list.
The start-up screen displays the following information:
ZORK I: The Great Underground Empire.
Copyright (c) 1981, 1982, 1983 Infocom, Inc. All rights reserved.
ZORK is a registered trademark of Infocom, Inc.
Revision 88 / Serial number 840726
...[spoiler]...
The ZORK game's command prompt (the symbol >) is different from the data server's system prompt (the symbol $).
====Game Menu====
restart - starts a new Zork adventure from the beginning.
save - saves all player progress in Zork. It actually creates a savegame file within the device the player had specified as save device for the main Black Ops game.
restore - restores a previously saved game.
quit - quits Zork. Don't forget to save your progress before quiting!
look - gives you a description of the location you are and the object in this location
brief - this tells Zork to give you the full description of a location and the objects in it only the first time you enter it. Thereafter, it only gives you the name of the location and the objects in it. (This is the default setting.)
verbose - this tells Zork to give you the full description of a location and the objects in it every time you enter it.
superbrief - this tells Zork to give you only the name of the location every time you enter it. It does not give the objects in it.
diagnose - gives a full medical report of your physical condition.
====Player Menu====
score - gives the player's score, statistics and rank name.
i(nventory) - views player's inventory. Displays a list of all objects, with descriptive information, the player has found, taken and put within the inventory.
====Player Movement====
n - go north.
s - go south.
e - go east.
w - go west.
u - go up.
d - go down.
ne - go northeast.
nw - go northwest.
se - go southeast.
sw - go southwest.
climb [object] - attempt to climb up the object.
climb through [object] - attempt to climb through the object.
enter [area] - enters a specified area.
jump - attempt to jump down from somewhere.
====Player Interactions====
take [object] - takes the object and places it into your inventory.
drop [object] - drops the object.
search [object] - search the object for anything useful.
what is [object] - get more information on the object.
where is [object] - get information on an object location.
open [object] - opens the object.
examine [object] - examines the object for anything unusual.
turn on [object] - attempt to turn the object on.
turn off [object] - attempt to turn the object off
read [object] - read any writings on the specified object.
put [object1] in [object2] - attempt to place object1 into container-object2.
roll up [object] - attempt to roll the object up.
wait - do nothing for a turn so that time will pass.
eat [object] - attempt to eat the specified object.
listen [object] - attempt to listen to the object.
break [object] - attempt to break the object.
break [object1] with [object2] - attempt to break object1 using object2.
again - repeats previously entered command
move [object] - attempts to move the specified object.
====Player Combat====
smash [object1] with [object2] - attempt to smash object1 using object2.
knock at [object] - knock at the object.
throw [object] - throw the object.
throw [object] at [target] - throw the object at specified target.
attack [target] - attacks the specified target.
taunt [target] - attempt to taunt the target, while avoiding attack.
kick [target] - attempt kicking a target.
block [object1] with [object2] - attempt to block / parry incoming object1 with object2.
hit [target] (with [object]) - attempt to hit the target using object.
kill [target] with [object] - finishing a preferably downed target using object.
====Other Actions====
win - displays "But of course!" or "Naturally!" but has no other effect.
lose - displays "Preposterous!" but has no other effect.
? - displays "I beg your pardon?".
hello - displays "Nice weather we've been having lately."
hello sailor - displays "Nothing happens here."
where is sailor - displays "You find it."
what is / look at sailor - displays "There's nothing special about the sailor."
what is / look at zork - displays "You can't see any zork here!."
what / where is [object] - when the object is in the same area close to the player, displays "It's right here! Are you blind or something?."
clean [object] - attempt to cleanse an object, displays: "If you wish, but heaven only knows why."
examine me - displays: "That's difficult unless your eyes are prehensile."
give me - displays: "What do you want to give the me to?"
yell - displays: "Aaaarrrrgggghhhh!"
zork - displays: "At your service!"