The story is a parody of horror B-movies. You control teenager Dave Miller and two of his friends. You are on a mission to rescue Dave's girlfriend, Sandy, who has been kidnapped to the mansion of Dr.Fred, a mad scientist.
Dr.Fred is under the influence of a purple evil meteor which landed near his mansion twenty years ago and has controlled his life ever since. Dr.Fred now wants to dominate the world, and, for some unclear reason, needs the fresh brains of teenagers to do this.
It is up to you to infiltrate his mansion, avoid getting caught by Dr.Fred's family, gain entrance to the secret lab and save Sandy!
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Originally released in 1987, Maniac Mansion was a groundbreaking game in many respects.
Back then, most computer adventure games used a parser to let the player type on the keyboard what he wanted his character to do. This often resulted in a frustrating experience in which the player had to struggle to figure out what the program wanted to see (for example, phrases like "open door with key" or "use key in door" wouldn't work if the computer only wanted "unlock door with key", even though all of these phrases describe the same action).
When budding game programmer Ron Gilbert was hired by Lucasfilm Games (now LucasArts) and got the green light to create his own adventure game, he didn't want the player to struggle with the parser anymore. He created a tool to allow the player, using a mouse, to choose from a set of common verbs displayed at the bottom of the screen, and combine them with the items and characters displayed in the game. This allowed the player to easily build sentences that the computer would always understand. He named this tool SCUMM (Script Creation Utility for Maniac Mansion) which Lucasfilm would keep using for ten more years.
Maniac Mansion was also one of the very first games featuring "cut-scenes", scenes that cut away from the action to let you know what's going on in a different part of the game, providing background information or clues. Nowadays this feature has become a staple of adventure games and RPGs.
Last but not least, Maniac Mansion featured different playable characters with different abilities, different ways to solve the game, and different endings. While this (unfortunately) didn't really catch on in later adventure games, it is definitely part of what made Maniac Mansion special.
