Dad's Key
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Dad's Key is an unlockable activated item.
Effect
- Upon activation, opens all doors in the current room in almost all circumstances.
Notes
- Dad's Key can open:
- Any normal doors that are closed during combat, even on floors that normally disallow this;
- Any dоor requiring
Keys; - Any door requiring
Bombs to blow open (including 
Secret Room and 
Super Secret Room doors); 
Challenge Room and 
Boss Challenge Room doors regardless of health total;- The door to the
Mega Satan arena; - The
Boss Rush door from inside; - The doors of a
Mini-Boss Room from inside; - Most
Boss Room dоors from inside; 
The 
Mausoleum / 
Gehenna doors without paying the health cost.
- Dad's Key cannot open:
- The Boss Rush door if the timer has already passed 20 minutes;
The door to the room leading to 
??? if the timer has already passed 30 minutes;
Angel Room or 
Devil Room doors from the outside;-
Locked Chests of any kind, or Key Blоcks; - The door of
Mom's Boss Room from inside; 
The exit door in Greed mode;
- Leaving the main room before clearing a set of waves will reset your wave counter, and repeated waves will not drop coins or charge your activated item.
The door to 
The Void during the 
Hush boss fight;- The flesh door leading to
Corpse; 
A Strange Door.
Synergies
Book of Virtues: Creates wisps in the middle ring. If the wisps touch Locked Chests, Special Room doors, or uncleared room doors, they will unlock and open them, destroying themselves in the process. These wisps can open any locked door they touch, including the door to the Mega Satan arena, A Strange Door, and the flesh door to Corpse. 
Bomb Chests and 
Mega Chests are unaffected. They will also donate to 
Key Masters on touch, destroying themselves in the process. Opening a chest in a Challenge Room with a wisp will not start the challenge.
Interactions
Car Battery: No effect.
In-game Footage
Gallery
3DS The icon of Dad's Key as seen on the lower 3DS screen.
Trivia
- This item is used in The Family Man (challenge #19) and Red Redemption (challenge #44), as well as the June 19th curated daily challenge.
- Dad's Key may be a reference to Isaac's father leaving his mother, as it can be used to escape from almost any conflict.
- In Wrath of the Lamb, this item was unlocked by beating
??? for the first time. - The function of this item is very similar to the Magical Key from The Legend of Zelda
 Dad Items
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| Items |
 Keys
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| Items |
| Trinkets |
| Cards and Runes |
 The Binding of Isaac: Rebirth
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