This video showcases how to find Paul in every single level, as well as unlocking him as a character.
Also, it is very important you beat every level after finding him, or else it won't save.
After finding all twelve Pauls, enter the room with the question mark at the hub and you will be able to play as him.
Chapters:
Boiler City 0:00
Slowroast Sewer 0:21
Cinnamon Springs 1:11
Bomb Candy Mines 1:31
The Big Bath 2:01
Concrete Jungle 3:09
Pinball Mire 3:35
The Mad Mall 4:01
Crimson Factory 5:16
The Mysterious Glasshouse 6:34
Devilled Gardens 7:56
Hell Manor 9:38
Unlocking Paul 11:26
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