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Why Adventure Games Suck (1989)
Ron Gilbert's often incoherent and bitter ramblings about the Game Industry
I played one game that required the player to drop a bubble gum wrapper in a room in order to get a trap door to open (object names have been changed to protect the guilty). When Indiana Jones rolled under the closing stone door and grabbed his hat just in time, it sent a chill and a cheer through everyone in the audience. If there is an object on the screen that looks like a box, but the parser is waiting for it to be called a mailbox, the player is going to spend a lot of time trying to get the game to do a task that should be transparent.
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