None of them really need it but I voted Zak McKracken. Only because it's a great game but suffers from poor interface and graphics, and I never actually finished it for those reasons. Maniac Mansion would be cool as well.
I fear if they did Day of the Tentacle they would ruin the beautiful graphics and characters, which are better represented by a few pixels than high resolution graphics. I feel your mind does most of the work in figuring out what they look like, and when they did Guybrush it wasn't how I imagined him in the original.
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