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Unlockables - Knack Guide - IGN
Knack - Road Map and Trophy Guide - PlayStationTrophies.org
Knack Mega Guide: Treasure Chests, Secret Rooms, Crystals
Characters in Knack - TV Tropes
Meet the unlockable characters in Knack - Polygon
Knack (video game) - Wikipedia
Trophies - Knack Guide - IGN
Knack Trophies for PlayStation 4 - GameFAQs
Knack PS4 tophies emerge, get the full list here - VG247
Amethyst Medal trophy in Knack - TrueTrophies