Hollow Knight is pretty light on Easter eggs, but there are a few vague connections we can make between it and the games and media that influenced Team Cherry. But like anything in Hollow Knight, it's hard to truly know how intentional these connections might be.
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Video Chapters:
00:00 Introduction
01:06 Metroid
02:02 Castlevania
02:56 Backer areas
03:30 Dark Souls
04:07 Faxanadu
04:53 Undertale
05:25 Cornifer's Hum
06:31 Midwife/No Face
07:24 Angel's Egg
08:49 Dune
10:53 Dung Defender
11:04 Outro