Binding of Isaac: Rebirth Wiki

Added in Repentance
Disambig.png This article is about the item. For the enemy, see Portal. For the chapter, see The Void.

Lil Portal is an unlockable 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 doesn't consume poop pickups when playing as Tainted ??? Tainted ???.
  • 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. This effect appears to be cosmetic only, but it will provide brief invincibility frames equivalent to two Ventricle Razor Ventricle Razor portals stacked on top of one another.[1] Same effect occurs if a portal is summoned in rooms that don't appear 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.
    • Softlocks can occur, however if the player has items like Pluto Pluto or has consumed enough "One Makes You Small" Pills then it is possible to avoid being softlocked as pushing up against walls of any kind will still allow passage through doors and with enough speed, pitfalls and obstacles as well. Because of this, It is highly and commonly advised to make your character small and relatively fast wherein possible when using Lil Portal for any extended amount of time.
    • Entering portals during Ascent that were created during the first clearing of a floor in Boss Room Boss Rooms or Treasure Room Treasure Rooms may cause the game to crash.

In-game Footage[]


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



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! A portal can be created next to a door which can block off an entire section of the map and cause a soft lock.
Bug Bug! Activating Glowing Hour Glass twice after Lil Portal consumed the last forth pickup will make him drop a portal while the pickups will stay untouched in the room. If you wont move after a second Glowing Hour Glass activation Lil Portal will drop a portal right at the entrance, which will block it and may cause a softlock.

A portal can be created during the beast fight, this will cause a soft lock