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▾Table of Contents▾
Smart D4 item
Smart D4 is an active item in Glacier's Laboratory, a mod for The Binding of Isaac.
Description
Activates a 4 seconds countdown upon use.
Each item Isaac has extends the countdown by 0.5 second.
During the countdown, Isaac holds up a random passive item he has, then he can:
• Switch to other passive items with shoot buttons.
• Use the item again to select current item.
• Press drop button to immediately end the countdown.
Glitched TMTRAINER item cannot be selected.
There is no limit of how many items Isaac can select.
Once the countdown ends, all selected items are rerolled into passive items drawn from current room's item pool.
Item pools
Smart D4 can be found in the following item pools:
| Name | Weight |
|---|---|
| Shop |
1.0/1.0
|
| Crane Game |
1.0/1.0
|
| Greed Treasure Room |
1.0/1.0
|
Tags
The following tags are applied to this item:
| Id | Description |
|---|---|
| offensive | Can appear for  Tainted Lost. |
| nocantrip | Not available as card effects during the Cantripped! challenge. |
Special synergies
The following special synergies and interactions for Smart D4 have been documented.
| Mod | Item | Synergy |
|---|---|---|
| --- | Book of Virtues |
Isaac's wisps are also rerolled alongside items.
Spawns extra random wisps if Isaac don't have any wisp, or all wisps are rerolled. |
| --- | Car Battery | Adds extra 4 seconds to the countdown. |
* Note that not all possible synergies and interactions are listed here.
External links
- Download Glacier's Laboratory from the Steam Workshop.
Book of Terror 
Mint Potion 
Torment Baby