Binding of Isaac: Rebirth Wiki
Binding of Isaac: Rebirth Wiki
Disambig.png This article is about the item. For the enemy, see Portal.

Added in Repentance

Lil Portal is a passive item added in The Binding of Isaac: Repentance.


  • Summons a portal familiar that launches itself in the direction Isaac shoots to deal contact damage to enemies.
  • The portal will consume all pickups and trinkets in its path, converting them into blue flies and causing the familiar to become larger and deal more contact damage.
    • Lil Portal deals contact damage equal to (2x consumables destroyed count + 2), and ticks up to 10 times per second.
    • When the familiar consumes four pickups, it will summon a portal that leads to an unexplored room on the current floor and its damage bonus is reset.


  • Lil Portal doesn't consume pickups or damage enemies it passes over while trailing behind Isaac; it only does so while being launched.
  • Lil Portal cannot be launched over Rocks or Metal Blocks.
  • The room portals take Isaac to is determined at the time they're created; if Isaac clears the room the portal would take him to, he will still be taken to that room if he uses it.
  • If every room has been explored, portals summoned by the familiar will do nothing and Isaac will jump up and down in them in a purely cosmetic effect. Same effect occurs if a portal is summoned in rooms that doesn't apper on map, as Mom's Heart room in Mausoleum Mausoleum/Gehenna Gehenna II.
  • Portals can lead to Curse Room Curse Rooms, forcing Isaac to take damage in order to leave.
  • Secret Room Secret Rooms and Boss Challenge Room Boss Challenge Rooms can be entered for free by making a portal after all other rooms on the floor are cleared.
  • Portals will persist after Isaac uses them or leaves the room, and will always lead to the same room.
    • Portals do not respect pathing rules, and can spawn on single-tile walkways and in front of doors, forcing Isaac to use them and preventing him from leaving the room through that door. This can cause a softlock depending on what door it blocks and where the portal leads.


  • Lil Portal bears a close resemblance to the Portal enemies.

In-game Footage[]


Bug Bug! If a portal is reencountered during the ascent, such as in a previously completed boss room, the game may crash if the destination the portal originally connected to no longer exists in the now altered floor layout.
Bug Bug! If Lil Portal consumes a Black Heart in a Devil Room that is part of the room layout (not a reward or contents of a bag or a chest), the game crashes.
Bug Bug! A portal can be created next to a door which can block off an entire section of the map and cause a soft lock.