"The Platonic Permutation" received mixed reviews from critics. Critics praised Sheldon and Amy's storyline but were critical of the other two subplots. IGN 's Jesse Schedeen said of Sheldon and Amy's storyline saved the episode from "total mediocrity". Caroline Preece of Den of Geek praised Sheldon and Amy's storyline as well, saying the other two subplots resolution's had "left something to be desired". Digital Spy 's Tom Eames said of "The Platonic Permutation": "Aside from a couple of sweet scenes with Sheldon and Amy, this was one of those episodes where you'd have a better time if you just looked at the photos and caught up on the synopsis on Wikipedia".