I have a confession: I went to Firework Isles for the fashion, and I stayed because a stone tablet bullied me into becoming a professional pyromaniac. In Infinity Nikki Version 1.2 — yes, I know it is 2026, but my map pins still have not healed — the cavern vaults do not open with keys. They open when you find and light 12 special fireworks, three per cavern, in any order. So equip the Fiery Glow outfit, put on shoes you can sprint in, and let us commit some extremely legal arson. 🎆

The Short Version, Because My Memory Is a Sieve

• There are four caverns: Gloomy Cavern, Behind the Mountain Cavern, Waterfall Cavern, and Songbreeze Cavern.

• Each cavern is linked to three special fireworks.

• That makes 12 fireworks total.

• You can light them in any order. The game is merciful for once.

• A stone tablet beside each cavern vault shows the clues for its three fireworks.

• You must use the Fiery Glow ability outfit to ignite the special Launch Tubes. Regular outfits will not cut it, no matter how cute they are.

Every Firework Location, Sorted by Cavern

Here is the checklist I wish I had before I spent 40 minutes floating in circles and arguing with a bridge.

Cavern	Firework Locations
Gloomy Cavern	1) A few steps from the stone tablet by the Gloomy Cavern Entrance. 2) In the middle of Crescent Moon Ruins, south of the Gloomy Cavern Entrance. 3) In Flaming Forest on the southwestern part of the isle. Use the Sizzle & Spark Center Warp Spire, walk past the bridge, defeat the nearby Esselings guarding the Launch Tube, then light it.
Behind the Mountain Cavern	1) Southeast of the Songbreeze Highland Foothills Warp Spire, close to the winding path. Defeat the Esselings guarding it. 2) East of the Fireworks Peak Warp Spire. Teleport there, float east until you see the tube on a mountaintop, then use Fiery Glow. 3) On the northwestern island of the Relic Isles. Warp to Crescent Shoal, use the ruins to make your way to the tube, and launch it.
Waterfall Cavern	1) Near the bridge southwest of the Sizzle & Spark Center Warp Spire. 2) On Sparkheart Island, by the broken bridge leading to the Relic Isles. 3) By the broken hanging bridge just a few steps northwest from the Whirl-A-Pony ride.
Songbreeze Cavern	1) Teleport to the Songbreeze Highland Hillside Warp Spire and float down to the lower cliff southwest of it. The firework overlooks the waterfall. 2) From the first Songbreeze firework, float down to the bottom of the waterfall and cross the water to the shore. 3) Head southeast from the Sizzle & Spark Center Warp Spire. It sits at the end of the thin path west of the plaza by the Firework Isles Dock.

The Cavern Crawl, But Make It Fashion

The Gloomy Cavern is probably your first unlock, since it is part of the Showdown! The Gloomy Cavern quest. Follow the northern path from the Entrance to Gloomy Cavern Warp Spire, find the cavern, then ignite the three fireworks marked on the stone tablet beside the entrance. Congratulations, you are now a licensed door opener.

Behind the Mountain Cavern hides northwest of the Songbreeze Highland Hillside Warp Spire, at the bottom of the mountain. Waterfall Cavern waits behind the bottom of the waterfall east of that same spire. Songbreeze Cavern is the polite one — it sits right in front of the Songbreeze Highland Hillside Warp Spire. Walk in after lighting its three fireworks, and try to look like you meant to solve it on the first try.

What Are Fireworks Actually For?

They unlock the vaults inside these caverns. Each vault has a stone nearby, and interacting with it shows the clues for the three fireworks you need. Light all three with Fiery Glow, and the vault opens. It is not just a pretty light show. It is a puzzle, a treasure key, and a reason to yell at a Launch Tube that is technically on a mountaintop.

Launch Tubes: The Boxy Ones Are Important

Cavern Launch Tubes look different from regular ones. They are boxier, painted red, propped on a wooden stand, and marked with the same logo as the vault doors. Regular Launch Tubes are tubular and light purple. If you are staring at a purple tube and wondering why nothing is happening, you are probably at the wrong tube. I have absolutely never done that. Definitely not twice.

My Final Field Notes

Do not save the fireworks for later. Light them as you find them, mark the stone tablets, and keep the Fiery Glow outfit ready. The isles are gorgeous, the Esselings are annoying, and the bridges are apparently designed by someone who hates my sense of direction. But once those 12 fireworks are lit and the vaults are open, you will feel like the most fashionable demolition expert in all of Miraland. 🎇