Ventricle Razor

Ventricle Razor is an activated item added in The Binding of Isaac: Afterbirth.

Effects[ | ]

When used for the first time, Isaac creates a blue portal under where he is standing. The next time he uses the item, he creates an orange portal. Isaac can then walk over either of the portals to teleport instantly to the location of the other one.
- Activating the item more than twice will replace the older of the two portals.
Upon entering a new floor, the previously placed portals will disappear.

Notes[ | ]

The portals can be placed in any room. However, if a portal leads to a room with a negative grid index (i.e. Devil Room, Angel Room, I AM ERROR room, Crawl Space, Boss Rush, Black Market, Mega Satan room, or ??? portal room), Isaac will not be able to enter the portal.
This item can be used to escape a Challenge Room or the Boss Rush.
Upon teleportation, Isaac is granted with a short invulnerability period which can be abused to trigger the Blood Donation Machine and Devil Beggar without losing health by placing a portal just next to it, teleporting, and touching the Donation Machine or Beggar in the same move. This trick is particularly useful for The Lost. The teleportation trick can also be used to enter a Curse Room without taking damage.
Upon teleportation, Isaac is granted with a short invulnerability period which can be used to enter a Curse Room without taking damage. However, it cannot be used to play Blood Donation Machines or similar machines for free.
Portals will stay even if the item is dropped or changed.
If Curse of the Maze is active, using portals placed between different rooms may result in a random destination. Two portals in the same room work reliably.
- If room contents are randomized by the curse, it's possible for the portals to end up completely surrounded or even inside rocks or pits. If Isaac can't move to safety, the run can be quit and resumed to be placed at a door.
On Downpour II, Ventricle Razor cannot be used to teleport between the normal and mirror world.
This item can be useful to exit Mom's boss room to start the Ascent, as long as you use it at least once before entering the boss room.
The item only costs 10 cents when found in a Shop.

Synergies[ | ]

Book of Virtues: Spawns a blue/orange wisp that circles the respective portal. Wisps do not fire tears. Wisps do persist if Isaac leaves the room and reenters.

Interactions[ | ]

Car Battery: Renders the item conventionally useless, however; two portals on top of one another can create invincibility^[1] at the cost of mobility and almost, but not all tears.
- Ventricle Razor works normally.

In-game Footage[ | ]

Trivia[ | ]

A ventricle is a hollow part in an organ.
The colors of the portals are a reference to the Portal Gun from the Portal series, whose portals share the same colors and functionality.

Bugs[ | ]

Bug!	Entering one of the portals causes the Found Soul familiar to become invisible until Isaac drops and picks up the trinket again or enters a new floor.