Blox Fruits Update 30: How to Complete the Lower Sky Island 3 Star Puzzle

Lower Skylands hides three separate secrets in Blox Fruits Update 30, and clearing all of them flips the island to a full three-star rating on the world map. Two of the three are gated behind random events, so the order you tackle them in matters more than the difficulty of any single one.

Quick answer: Grab a Lightning Bolt from a blinking storm cloud and hand it to the Mad Scientist at sea level, raid the Sky Castle vault using the code on the Crumpled Letter, and chase the golden cloud until it drops the chained chest. Each turn-in awards one star, and the third one triggers the “LOWER SKYLANDS COMPLETED” banner.

Lower Skylands secrets: what each one needs before you can start

Open the world map and set your route to Lower Sky Island first. Only one of the three secrets can be started on demand; the other two wait on spawns you cannot force, so it is worth knowing which is which before you park yourself on the island.

Blox Fruits world map with the Lower Sky Island location highlighted — The world map with Lower Sky Island selected, where all three secrets are anchored.

Secret	What it waits on	Turn-in
Lightning Bolt delivery	A dark storm cloud that blinks black or blue above the island	Mad Scientist, at sea level
Angel Guard’s Treasure (Sky Castle vault)	The castle raid event, which is random	Angel Guard
Golden cloud chest	A chat announcement that the golden cloud has spawned	Angel Guard

Do the Lightning Bolt delivery first

This is the one secret you can usually start the moment you land, which makes it the sensible opener while you wait for the castle raid or the golden cloud to appear. It is a fetch job with no fight attached.

Scan the clouds around Lower Skylands for a dark one that is visibly flickering black and blue. Regular clouds sit still, so the flashing one stands out once you know to look for it.

Attack the charged cloud with basic hits until it breaks. You will see “Caught a Lightning Bolt” and pick up a Rare item called Lightning Bolt, described in the inventory as raw current pulled out of a charged storm cloud.

Drop down from the sky islands to the small island directly below at sea level. Falling straight down is faster than sailing, and the landing spot is right under the Skylands.

Portal ability panel with Portal Dash on Z highlighted as the player nears a portal entrance — The Portal ability panel with Portal Dash [Z] highlighted, one of the quicker ways to close distance on the trip down.

Find the Mad Scientist standing under a tree on that lower island and talk to him. Pick the “I’ll get you one” option to accept the request rather than “Walk Away.”

Mad Scientist dialogue box showing the I’ll get you one reply option — The Mad Scientist’s dialogue, where “I’ll get you one” accepts the Lightning Bolt request.

Talk to him again and choose “Hand it over” to give up the Lightning Bolt. That closes the secret and banks a star for the island.

Note: if you already have the bolt in your inventory when you first meet him, the handover can happen immediately, so there is no need to farm a second cloud.

Sky Castle vault: break the roof door and read the code

The Angel Guard on Lower Skylands kicks this one off. His pitch is that bandits came out of the clouds, took the Skylands hoard, and now sit on it inside the castle, and that he is not allowed to leave his post. Talking to him starts the quest, but the castle only becomes enterable once the raid event is live, and that timing is random.

Speak to the Angel Guard to pick up Angel Guard’s Treasure, then fly over to the Sky Castle.

Land on the castle roof and look for the Secret Door marked with an X. Use the Break prompt on it to open a way in, then drop through the hole.

Clear the room. The whole raiding crew is inside, and the vault stays sealed until every invader is down.

Go to the table on the right side of the room and interact with the Crumpled Letter. Reading it reveals a four-digit code, and the note itself spells it out with a line like “The vault stays on 8405 until the captain says otherwise.”

Crumpled Letter on a table inside the Sky Castle revealing the four-digit vault code — The Crumpled Letter naming the current vault code, which is rerolled each time.

Walk up to the Angelic Vault, choose “Enter the code,” and type the four digits into the VAULT KEYPAD. The lock clicks, the door swings open, and a chest is sitting in the middle of the room.

Take the treasure and fly it back to the Angel Guard for the first of the three stars.

Tip: the code is randomized per run. Copying 8405 or any number you saw someone else use will not open the keypad, so read the letter every time.

Golden cloud chase and the chained chest

The last secret is the one most likely to keep you waiting. A golden cloud spawns around the island on its own schedule, and the chat log announces it when it does, so keep an eye on the feed instead of circling the island blind.

Watch chat for the event announcement, then locate the golden cloud drifting over Lower Skylands.

Chase it. The cloud runs from you and takes a few passes to give up, and the text on screen makes the moment obvious when it does, with the cloud splitting open and the Skylands chest falling out of it.

Golden cloud drifting over Lower Skylands during the chest chase event — The golden cloud that has to be chased down before it coughs up the Skylands chest.

Interact with the chest, which is bound in diamond chains, and pick Smash Chains rather than Sneak Out. This pulls in a Strong Brute and a group of Sky Bandits who claim the treasure is theirs.

Kill the Strong Brute to take his key, then open the chest. The payout is money, listed as $2,229 in one run.

Return to the Angel Guard and hand in the quest to lock in the star.

How to confirm all three stars registered

When the last of the three turn-ins goes through, a “LOWER SKYLANDS COMPLETED” message appears on screen. Open the world map afterwards and the island’s icon should read three out of three stars. Those stars count toward the 40 total across Sea 1 that unlock the teleporter in Middle Town, so none of them are wasted effort.

If a secret refuses to progress, the cause is almost always timing rather than a missed step. The castle vault stays locked until the raid event has actually spawned the invaders inside, the golden cloud cannot be found before chat announces it, and the keypad rejects any code other than the one printed on the letter in your current run.

Realistically, the fastest route is to sit on Lower Skylands, clear the Lightning Bolt handoff straight away, and treat the castle raid and the golden cloud as opportunities that come to you. Neither fight is demanding once it starts, and the stars are permanent, so a single visit with a bit of patience is usually enough to finish the island for good.