Ridiculous Metal is an unlockable trinket in Fiend Folio, a mod for The Binding of Isaac.

Upon entering an uncleared room, a rhythm minigame is initiated. Shooting at the exact moment when the 2 blue bars are in the middle will yield rewards.

The bar can contain 4-16 notes based on a random chance:
• 52.63% - 4 beats
• 26.32% - 6 beats
• 13.16% - 8 beats
• 5.26% - 12 beats
• 2.63% - 16 beats

When inside a Boss Room, the bar will always have 16 notes.

The beat is chosen at random each room, having different sound and timing. Some beats have different timings in-between.

Each beat hit properly deals damage to enemies equal to Isaac's DPS (damage per second, calculated as (DamageStat + 30) / (MaxFireDelay + 1)), multiplied by the amount of beats hit in a row.

Hitting all beats properly will result in a stat boost for the current room. 1-5 stats are randomly boosted based on the number of beats in the room (4 beats = 1 stat boost, 6 beats = 2 stat boosts, etc). Multiple of the same stat can be boosted at once.
+0.1 speed.
-10% max fire delay.
+0.1 damage.
+1.25 range.
+0.1 shot speed.

If the room had 8 or more beats and all were hit properly, the effects of The Necronomicon will be activated.

Complete The Gauntlet challenge.

The following special synergies and interactions for Ridiculous Metal have been documented.

* Note that not all possible synergies and interactions are listed here.

• Check out the trinket description on the mod's external Wiki.
• Download Fiend Folio from the Steam Workshop.