Day of the Tentacle by LucasArts
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Day of the Tentacle, also known as Maniac Mansion II: Day of the Tentacle, is a 1993 graphic adventure game developed and published by LucasArts. It is the sequel to the 1987 game Maniac Mansion. The game's plot 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 player takes control of the three and solves puzzles while using time travel to explore different periods of history.
Plays on Linux with the use of SCUMMVM or DOSBox. Both are free and easy-to-use.