Popo Modo
Popo Modo is a mode added in The Monthiversary Update, It can be enabled in the Dead Sea Scrolls options menu of Fiend Folio: Reheated.
While enabled, entering a new room has a chance to spawn 2 unique portals, which spawn IDPD enemies from the game Nuclear Throne before disappearing.
Enemies
IDPD Grunt
Runs around the room, shooting 2-4 lasers bolts at Isaac, occasionally rolling to dodge attacks or if the player comes too close. Rarely throws a grenade at Isaac that magnetises him and other enemies towards it, before exploding after a few seconds.
IDPD Inspector
Randomly runs around the room, firing a single, large laser bolt at the player. Will also occasionally create a magnetic effect, pulling the player towards itself.
IDPD Inspectors will only appear from portals from Chapter 2 onwards.
IDPD Shielder
Runs around the room, shooting a large array of laser bolts at the player. Occasionally upon taking damage, it will turn itself into a large metal block, where it will remain stationary and be unable to attack. Shooting at this block will deflect all the players tears back towards themselves. After a short moment, the Shielder will turn back to normal.
IDPD Shielders will only appear from portals from Chapter 3 onwards.
 Modes 
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| Gameplay Modes |  Super Easy Mode -  Mern Mode -  Stable Mode -  Popo Modo
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| Character Modes |  Classic Tears Mode -  Imp Baby Mode -  Pica Golem
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| Other Modes |  Women Identifier -  Secret Mode
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