Test the eight photographed gongs and record the four that do not turn the crystals red. Wrong gongs reset the ringing, not which four are correct.
For the main quest, test during an eclipse after completing the crystal trials. A correct gong gives the positive sound/character cue; a wrong one flashes the crystals red. Leave uncertain gongs as “Untested”.
Record only what you have tested. A previous failure does not shuffle the correct set.
Main quest: in the eclipse, use the Fractalizer to shoot the Minecart geyser crystal and catch the dynamite. Recharge the gongs, then shoot the Mud Room crystal to shrink the meteor.
Samantha secret: with all four gongs ringing, use the starting pistol on the five pans at the bottom of the slide: leftmost twice, fifth/rightmost once. Then start the doll beside the Minecart Danger sign.
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Gameplay: Activision / Treyarch. Screenshots and symbol references: mmmrkennedy, COD Zombies Guides, Glitching Queen and the r/CODZombies community, as applicable. Some shared-layout references show the original release. The map’s sources credit the walkthroughs and their contributors.