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▾Table of Contents▾
F4 Key item
F4 Key is an active item in Furtherance, a mod for The Binding of Isaac.
Description
Teleports Isaac to a random unvisited special room on the current floor based on what pickup Isaac has the least of.
Coins: Arcade.
Bombs: Super Secret, Isaac's Room, Secret Room.
Keys: Treasure Room, Dice Room, Library, Chest Room, Planetarium.
Can teleport Isaac to any of the rooms above if all consumable counts are equal.
Item pools
F4 Key can be found in the following item pools:
| Name | Weight |
|---|---|
| Secret Room |
0.5/1.0
|
| Greed Shop |
1.0/1.0
|
| Greed Devil Room |
1.0/1.0
|
| Greed Secret Room |
0.5/1.0
|
Tags
The following tags are applied to this item:
| Id | Description |
|---|---|
| nocantrip | Not available as card effects during the Cantripped! challenge. |
| offensive | Can appear for  Tainted Lost. |
Special synergies
The following special synergies and interactions for F4 Key have been documented.
| Mod | Item | Synergy |
|---|---|---|
| Furtherance | Alt Key | On use of F4 Key while Alt Key is in the secondary slot, the floor will have  Curse of Darkness!, all enemies lose AI and collision, all regular doors are permanently open. Entering the boss room reverses these effects. Non-story bosses will be replaced with an Error Shopkeeper and clear the room. |
* Note that not all possible synergies and interactions are listed here.
External links
- Download Furtherance from the Steam Workshop.
Caps Key 
Enter Key 
Shift Key 
Tab Key 
Ophiuchus? 
Chiron?