BC11 Keys are Bomb is an unlockable challenge in Benighted Soul, a mod for The Binding of Isaac.
This challenge is played on Hard mode.

keys x 10
Chest Chest (Consumable slot)
Broken Padlock (Smelted)
Match Stick
Bombs are Key

Note: this list does not include characters' default starting items.

Costs bombs instead of keys to repair chest equipment.

Some chance to fire a bomb instead of key tear.

The following is unlocked for completing the BC11 Keys are Bomb challenge: Benighted Lost starts with a random chest.

Unlock Benighted Lost.

• Download Benighted Soul from the Steam Workshop.