Released: 1993, DOS, Mac OS Classic
Maniac Mansion: Day of the Tentacle is a graphical adventure game originally released in 1993, developed and published by LucasArts. Like other LucasArts adventure games of the time, it runs on the SCUMM engine. It was released simultaneously on floppy disk and CD-ROM.
The game, a loose sequel to Maniac Mansion, follows Bernard Bernoulli and his friends Hoagie and Laverne as they attempt to stop the evil Purple Tentacle—a sentient, disembodied tentacle—from taking over the world. The game utilizes time travel and the effects of changing history as part of the many puzzles to be solved in the game.
Despite seemingly having a relatively smooth development, the game is actually packed with a surprising amount of unused content including tons of dialogue, an unusually expansive debug mode (for LucasArts games of the time), many graphics and animations, remnants of several inventory items and much more.