Upon entering an uncleared room, Golem holds a guitar and begins a rhythm minigame, where a bar appears below him with a random number of blue notes closing into a yellow bar in the center. Firing tears with the correct timing, as indicated by the blue notes, will deal damage to all enemies in the room.
The damage dealt to enemies per note played is equal to (Damage ÷ 8) × Combo × Trinket Multiplier. Missing a note will reset the combo multiplier.
If the total number of notes in the sequence is 8 or more, and all notes have been successfully played without missing, the final note will also activate The Necronomicon effect, dealing an additional 40 damage to all enemies.
Hitting the final note of the sequence will grant Golem random stat boosts based on the amount of notes successfully played. These boosts disappear upon leaving the room.
Boss Rooms will always have 16 notes appear in the bar. In all other rooms, the number of notes that can appear will be random, with the higher number of notes being rarer than the lower number of notes.
Musical notes will orbit around the player when successfully making a combo. The number that appears below the bar is the total number of notes played correctly in the sequence.
A Missing Page / Missing Page 2: Missing Page and Missing Page 2 will each increase the damage dealt to all enemies upon hitting all 8 or more notes without missing by +40.
Ridiculous Metal was designed by one of the winners of the Stronger Than Golem challenge, Dastarod.
Ridiculous Metal's name is a reference to Ridiculon, the composer of the soundtrack for The Binding of Isaac: Rebirth, Afterbirth, Afterbirth+ and Repentance.
Ridiculous Metal's effect is a reference to the Sound Battle mechanic from the game Mother 3, which required the player to attack in time with the beat of the song playing during the battle.
This is tied in with the orbiting notes that appear around the player with each successful note played, and the maximum combo of 16 that can be attained — mechanics which are both based directly off of those in Mother 3.
The Necronomicon effect, dealing an additional 40 damage to all enemies.
Trinket Multipliers / 
Henge Rock: Multiplies the damage dealt to enemies with each note played.
A Missing Page / 
Missing Page 2: Missing Page and Missing Page 2 will each increase the damage dealt to all enemies upon hitting all 8 or more notes without missing by +40.
Azurite Spindown: Using Azurite Spindown on Ridiculous Metal rerolls it into 
Wormhole Rock.
