Darkest/Edgiest M-Canon title? (SEE DESCRIPTION)

According to the TV Tropes, five Mario games directly produced by Shigeru Miyamoto (or as I call it, the "M-Canon") qualify as being "Darker and Edgier".

Out of those five, which one do you find to be the darkest/edgiest? Feel free to opine in the comments below.

The five games are as follows:

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