There are 28 total suits to unlock in Spider-Man for PS4 as of launch day, some of which are very well hidden. Below you'll find a list, images, and video
Marvel's Spider-Man Side Mission Walkthrough - Tombstone: What's
Marvel's Spider-Man Side Mission Walkthrough - Tombstone: Let's
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All Marvel's Spider-Man 2 Suits - Marvel's Spider-Man 2 Guide - IGN
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The Mask - Marvel's Spider-Man Guide - IGN
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Marvel's Spider-Man Side Mission Walkthrough - Storming the Castle
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Marvel's Spider-Man 2 Suit List Leaked Online
Final Test - Marvel's Spider-Man: Miles Morales Guide - IGN