There are 30 Lost Fleas to find in Hollow Knight: Silksong, including Kratt, Vog and the Huge Flea. You can rescue them in any order. For the first caravan milestone, find any five and return to Fleamaster Mooshka in The Marrow. This checklist follows the Hollow Knight Wiki’s numbered locations; pair it with your map if your route or area labels differ.
Start the Lost Fleas Wish
Pick up the Lost Fleas Wish from the Wishwall in Bone Bottom or by speaking to Fleamaster Mooshka in The Marrow. After rescuing five Fleas, return to Mooshka to complete the first milestone. The caravan can then move to Greymoor; if Moorwing is undefeated, taking the ride can temporarily skip that boss. The Lost Fleas quest guide covers the Wish and first milestone.
All 30 Lost Flea locations
Ability names and route requirements below follow the Hollow Knight Wiki’s list. “None listed” means that list gives no specific ability requirement; it does not mean the room is hazard-free. Hidden passages, breakable walls and enemy encounters can make the route less obvious than the short clue suggests.
| # | Area | Where to look | Requirement or caution |
|---|---|---|---|
| 1 | The Marrow | Platform up from the beginning of the room. | Defeat Bell Beast and activate the bellshrine. |
| 2 | Deep Docks | Breakable wall to the left of the Bellway station. | None listed. |
| 3 | Deep Docks | From the Swift Step pickup, go left and hit the upper-right lever. | Swift Step. |
| 4 | Deep Docks | Lower section behind a door; fight through the enemy gauntlet. | Clawline. |
| 5 | Hunter’s March | Small platforming route near the entrance. | Defeat Skarrgard at the entrance. |
| 6 | Far Fields | Flea cage guarded by a Skarr Scout, triggered by the cage or nearby pressure plate. | None listed. |
| 7 | Far Fields | Secret route from the Bellway station; the locked gate prevents access from Pilgrim’s Rest. | Drifter’s Cloak and Cling Grip. |
| 8 | Wormways | Defeat the Aknid carrying the Flea. | None listed. |
| 9 | Greymoor | Pogo off balloons and follow the right wall. | Defeat the enemy gauntlet in Craw Lake. |
| 10 | Greymoor | Reach the top of the left tower. | Cling Grip. |
| 11 | Greymoor | Find Kratt behind a breakable wall above Halfway Home. | Cling Grip; Kratt later opens a spa at the Caravan. |
| 12 | Bellhart | In the upper tunnel in Bellveins; after Sister Splinter, head right. | Cling Grip; defeat Sister Splinter. |
| 13 | Shellwood | Below the section with Gahlias; approach from the top of the room. | None listed. |
| 14 | Blasted Steps | At the top of the room left of the Bellway station. | Cling Grip. |
| 15 | Sinner’s Road | A Muckroach attacks as Hornet approaches. | None listed. |
| 16 | Bilewater | Behind a breakable wall; defeat two Snitchflies. | None listed. |
| 17 | Bilewater | Use a secret passage inside the Exhaust Organ, left of its upper entrance. | Complete traversing the Mist. |
| 18 | Bilewater | Above the secret bench room. | Cling Grip. |
| 19 | Underworks | Enter from Wisp Thicket through a breakable ceiling, then complete the platforming route. | Cling Grip and Faydown Cloak. |
| 20 | Underworks | Across the room with Cogwork Haulers. | None listed. |
| 21 | Choral Chambers | Beyond a platforming section. | None listed. |
| 22 | Choral Chambers | Behind a breakable wall; use the mechanism or pogo off sawblades. | Drifter’s Cloak or needle-bounce. |
| 23 | Memorium | Free the Huge Flea, then defeat it. | Faydown Cloak; prepare for a fight. |
| 24 | The Slab | Inside a mist-covered door; listen for the Flea from outside. | None listed. |
| 25 | The Slab | Above the rest bench, in a small chamber at the upper-left of the opening. | Faydown Cloak. |
| 26 | Mount Fay | Free the frozen Flea by hitting it with the Needle. | Cling Grip. |
| 27 | Sands of Karak | At the top of the room, behind encrusted coral on the right. | No requirement listed for the coral route; Silk Soar is an alternate route. |
| 28 | Putrified Ducts | Follow the route involving Barnaks and platforming to reach Vog, then speak to her. | Vog can later mark missing Flea locations for Rosaries. |
| 29 | Whispering Vaults | Find the hidden passage behind curtains below Cardinius’s room, then complete the long platforming route. | Clawline and Cling Grip. |
| 30 | Whispering Vaults | Push a box from the middle-left to reach the top of the room. | Cling Grip. |
The checklist is based on the Hollow Knight Wiki’s 30-entry Flea list. For more granular room navigation, Nintendo Life’s room-by-room Lost Flea guide describes, among other routes, the hidden ceiling path in Far Fields, the spike-heavy approach to its second Flea, and the root-and-coral route through Sands of Karak.
The Tool Desk
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- Discover the fallen insect kingdom of Pharloom! Explore mossy grottos, gilded cities and misted moors as you ascend to the shining citadel at the top of the world.
- Engage in lethal acrobatic action! Wield a huge suite of deadly moves as you dance between foes in swift, beautiful combat.
- Craft powerful tools! Master an ever-expanding arsenal of weapons, traps, and mechanisms to vanquish your enemies and explore new heights.
- Solve shocking quests! Hunt down rare beasts and solve ancient mysteries to grant the wishes of the downtrodden and restore the kingdom’s hope.
- Face over 200 ferocious foes! Beasts and hunters, monsters and knights. Defeat them all with bravery and skill!
What happens after the first five?
Later caravan thresholds and rewards are reported differently by the two guides, so treat the later milestones as unconfirmed unless your game shows the requirement. The Hollow Knight Wiki lists 12 Fleas for the Blasted Steps move and a Spool Fragment, 22 for the move to Pale Lake in Putrified Ducts and a Tool Pouch, and 30 for the Egg of Flealia and access to the Festival of the Flea in Act 3. Nintendo Life instead reports 15 for the Blasted Steps move and Spool Fragment, 25 for the Putrified Ducts move and Tool Pouch, and a 30-Flea Egg of Fleelia Tool. Speak to Mooshka to trigger caravan movement; the guides also differ on some reward naming. Nintendo Life’s guide and the Wiki’s Flea page are the sources for these conflicting accounts.
Quick Recap
Rank #4
![Hollow Knight - Nintendo Switch [Digital Code]](https://m.media-amazon.com/images/I/51nXCF+sf5L._SL160_.jpg)
- Classic side-scrolling action, with all the modern trimmings.
- Forge your own path! The world of Hallownest is expansive and open. Choose which paths you take, which enemies you face and find your own way forward.
- Evolve with powerful new skills and abilities! Gain spells, strength and speed. Leap to new heights on ethereal wings. Dash forward in a blazing flash. Blast foes with fiery Soul!
- Equip Charms! Ancient relics that offer bizarre new powers and abilities. Choose your favorites and make your journey unique!
- An enormous cast of cute and creepy characters all brought to life with traditional 2D frame-by-frame animation.
Rank #3
- Classic side-scrolling action, with all the modern trimmings.
- Tightly tuned 2D controls. Dodge, dash and slash your way through even the most deadly adversaries.
- Explore a vast interconnected world of forgotten highways, overgrown wilds and ruined cities.
- Forge your own path! The world of Hallownest is expansive and open. Choose which paths you take, which enemies you face and find your own way forward.
- Evolve with powerful new skills and abilities! Gain spells, strength and speed. Leap to new heights on ethereal wings. Dash forward in a blazing flash. Blast foes with fiery Soul!.Equip Charms! Ancient relics that offer bizarre new powers and abilities. Choose your favourites and make your journey unique!.An enormous cast of cute and creepy characters all brought to life with traditional 2D frame-by-frame animation..
Rank #2
- Hollow Knight: Silksong is the epic sequel to Hollow Knight, the award winning action-adventure.
- Journey to all-new lands, discover new powers, battle vast hordes of bugs and beasts and uncover secrets tied to your nature and your past.
Finding a last missing Flea
- Check the hidden-route areas first: look for breakable walls, curtains, suspicious ceilings, mist-covered doors and paths concealed by machinery.
- Compare your abilities with the checklist. Several routes explicitly require Cling Grip, Clawline, Faydown Cloak, Swift Step or Drifter’s Cloak.
- Revisit locations with mandatory encounters if you left before defeating the guard or freeing the captive.
- Once you find Vog, speak to her at the Caravan: she can mark missing Flea locations for Rosaries.
- Count Kratt, Vog and the Huge Flea among the 30; they are part of the total, not extras.
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