Like Coins and Bombs, you can carry up to 99 keys at a time, and any additional keys collected will not be counted.
Keys in shops cost 5 coins, 3 when on sale.
Usage for KeysEdit
Contains two free book Items (Such as Anarchist's Cookbook, Book Of Sin, Book Of Belial, etc.) on two pedestals inside. The door is identical to that of a Shop, but is marked with a book on the mini-map instead of a coin.
Drops a large amount of Pick Ups when opened, and sometimes an item or another Chest.
Blocks Isaac's movement, will consume a key and open up when walked over. Rarely drops a Pick Up when opened.
Added in Wrath of the Lamb DLC; A golden key has a 1/100 chance to replace a normal key when one is dropped. When picked up, a special sound effect is play and the key icon on the player's HUD gets a Golden Key next to it.
When Golden Keys are held, any object that is opened will not deplete Isaac's current supply of keys, essentially giving him an infinite supply of keys. The Golden Key is removed upon going to the next floor.
Key Related ItemsEdit
The Skeleton KeyEdit
Increases the chances of a Key/Golden Chest dropping after clearing a room.
Note: This item has no effect in v1.48 and above.