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Catch Bugs Secret Tomb Guide — Unlock, 3 Key Bugs, Bone Net & Farming (2026)

The Catch Bugs Secret Tomb is the hidden endgame area beneath Dune Burrow. To unlock it you carry three specific bugs in your active inventory at the same time — Crescent Wing Butterfly (Moon Hollow, after 6:30 PM), Wasp Moth (Deeproot Caves) and Spiny Harvestman (Dune Burrow) — then walk into the glowing rune tunnel in Dune Burrow. Inside you meet Anpu, buy the 200M Bone Net, and farm Undead Scorpion and Thousand Scorpion Exotic spawns for strong vivarium income.

Quick answer — Secret Tomb unlock: Carry Crescent Wing Butterfly + Wasp Moth + Spiny Harvestman in your active inventory (not stored, not donated to Critterpedia), then enter the rocky tunnel with glowing runes between the Potion Traders and the waterfall in Dune Burrow. The tomb opens automatically. Anpu inside sells the Bone Net for 200,000,000 cash — the highest-luck net in the game. Last checked: 2026-06-23.

Related guides

Best Net Guide Bone Net vs Scorpion Net stats and full upgrade order. All Locations Dune Burrow route and zones for all three key bugs. Bug List Key bug rarities, tomb spawns and desert targets. Beginner Guide Progression route if the tomb grind feels too slow.

Catch Bugs Secret Tomb at a glance

The Secret Tomb is a hidden endgame area under Dune Burrow in Catch Bugs. Carry Crescent Wing Butterfly, Wasp Moth and Spiny Harvestman at the same time, then enter the rocky tunnel between the Potion Traders and the waterfall to unlock it. Inside you find the Anpu NPC, the Bone Net (200,000,000 cash) and exotic spawns including Undead Scorpion, Thousand Scorpion and the Secret Tomb Swarm. The three key bugs must be in your active inventory — not donated to Critterpedia or stored.

Last checked 2026-06-23 · Verification: verified · Sources: ProGameGuides — How to Unlock the Secret Tomb, YouTube — How to Unlock Secret Tomb, YouTube — How To Get To The New Secret Tomb, NoLEEP — Unlock the Secret Tomb (3 Bug Locations), GameSToUse — Unlock Secret Tomb

The three Secret Tomb key bugs

You only unlock the Catch Bugs Secret Tomb when you carry all three of these bugs in your active inventory at the same time. Each comes from a different zone. The critical rule: bugs donated to Critterpedia or placed in storage do not count — only active-inventory bugs trigger the rune wall.

Crescent Wing Butterfly

elusive

Where
Moon Hollow
Spawn window
After in-game 6:30 PM (night cycle only)
Tip
Wait through the day cycle in Moon Hollow until the time passes 6:30 PM. The spawn window is night-only — if you arrive during the day, wait near the entrance or farm common bugs until dusk.
Common mistake
Catching the butterfly and immediately selling it for cash — keep it in your inventory.

Wasp Moth

exotic

Where
Deeproot Caves
Spawn window
Anytime during the cave cycle — no day/night restriction
Tip
Exotic rarity in Deeproot Caves. Use a Royal Net or higher to consistently land Wasp Moth. If it's not spawning, try moving between the inner cave chamber and the cave entrance to refresh the spawn pool.
Common mistake
Using a starter or fast net and failing the catch roll on an Exotic bug.

Spiny Harvestman

elusive

Where
Dune Burrow
Spawn window
Look near the burrow entrances and rocky outcrops — no day/night restriction
Tip
The Spiny Harvestman is already in Dune Burrow where the Secret Tomb entrance is. Catch it last so you can walk straight to the tomb tunnel without travelling between zones.
Common mistake
Catching the Spiny Harvestman before the other two and then losing the stack when travelling zones.
Inventory rule: All three key bugs must be in your active inventory at the same time when you enter the Dune Burrow tunnel. Donating them to the Critterpedia or placing them in storage removes them from the active stack — the rune wall will not recognise stored or donated bugs.

How to get each Secret Tomb key bug — farming tips

Crescent Wing Butterfly (Moon Hollow — Elusive, night-only)

The Crescent Wing Butterfly is the hardest Secret Tomb key to time. It is an Elusive-rarity bug that only spawns in Moon Hollow after the in-game clock passes 6:30 PM. If you arrive during the daytime, wait near the Moon Hollow entrance or farm common bugs until the night cycle begins. Bring a Royal Net or better — Elusive rarity means the catch roll can fail with a starter net. Do not sell the butterfly even though it has a high sell value. Keep it in your active inventory and head straight for Deeproot Caves next.

Wasp Moth (Deeproot Caves — Exotic, any time)

The Wasp Moth is an Exotic-rarity bug found in Deeproot Caves at any time of day — no day/night restriction. This makes it the easiest of the three to collect on demand. If Wasp Moth is not spawning, try moving between the inner cave chamber and the cave entrance to refresh the spawn pool. Use a Royal Net or stronger; Exotic bugs have a higher catch resistance and starter nets miss often.

Spiny Harvestman (Dune Burrow — Elusive)

The Spiny Harvestman spawns in Dune Burrow near the burrow entrances and rocky outcrops. It has no time restriction. The smart play is to catch the Spiny Harvestman last — since it is already in Dune Burrow where the Secret Tomb tunnel is, you can walk directly to the entrance the moment you catch it, without crossing zones. If you catch it first you risk losing the three-bug stack when travelling to Moon Hollow or Deeproot Caves.

Recommended farming order

  1. Travel to Moon Hollow. Wait for 6:30 PM in-game if needed. Catch Crescent Wing Butterfly. Keep it in active inventory.
  2. Travel to Deeproot Caves. Catch Wasp Moth at any time. Now you have two key bugs.
  3. Travel to Dune Burrow. Catch Spiny Harvestman near the rocky outcrops.
  4. Walk directly to the Secret Tomb tunnel (between Potion Traders and waterfall). The tomb opens.

Catch Bugs Secret Tomb entrance — step by step

The Secret Tomb tunnel is in Dune Burrow, identifiable by a stone wall with glowing runes. It only opens for players carrying all three key bugs in their active inventory simultaneously.

  1. Spawn in or travel to Dune Burrow.
  2. Walk toward the Potion Traders / net upgrade area.
  3. Head right toward the waterfall.
  4. Between the large rock and the waterfall, look for a small rocky tunnel / nook — the entrance has a stone wall with glowing runes.
  5. With all three key bugs in your active inventory, walk into the tunnel — the Secret Tomb opens automatically.

Sources: ProGameGuides — How to Unlock the Secret Tomb, GameSToUse — Unlock Secret Tomb

Inside the Secret Tomb — Anpu, Bone Net & Exotic spawns

Once the Secret Tomb opens, the first NPC you meet is Anpu. Anpu sells the Bone Net for 200,000,000 cash — it is the only place to buy it in the game. The Bone Net has the highest luck stat of any net in Catch Bugs, roughly +1,877 more than the Scorpion Net, at the cost of lower strength and weight capacity.

Bone Net vs Scorpion Net — which should you buy?

Net Cost Luck Strength Weight capacity Best for Where to buy
Bone Net 200,000,000 Highest in game Lower Lower Rare & Elusive bug hunting Anpu — inside Secret Tomb
Scorpion Net 250,000,000 –1,877 vs Bone Net High High Heavy catches, Colossal Sandworm Endgame net shop

Most endgame Catch Bugs players carry both nets and swap between them: Bone Net for luck-based rare hunting inside the tomb and cave biomes, Scorpion Net for high-weight catches like Colossal Sandworm in the Desert zone. For the full net upgrade order from Starter to Ancient Net, see the best net in Catch Bugs Roblox guide.

Source: ProGameGuides. Luck delta (+1,877 vs Scorpion Net) verified. Absolute luck values not yet confirmed across multiple independent sources. Last checked 2026-06-23.

Confirmed Secret Tomb spawns

Bug Rarity Farming note
Undead Scorpion exotic High-value Exotic — great vivarium income. Pair with Bone Net for best luck rolls.
Thousand Scorpion exotic Rarer Exotic than Undead Scorpion. Pairs with Bone Net; consider using Scorpion Net if you want the weight capacity for stacking swarms.
Secret Tomb Swarm exotic Group swarm event — catch as many as possible quickly. Bone Net is ideal for the luck rolls on the entire swarm group.

Spawns confirmed via ProGameGuides and YouTube walkthroughs. Verification status: Undead Scorpion and Thousand Scorpion — verified; Secret Tomb Swarm — needs_check.

Secret Tomb farming strategy

Once you have the Bone Net from Anpu, the Secret Tomb becomes one of the strongest endgame farming loops in Catch Bugs. Here is how to get the most out of it.

Best net setup inside the tomb

Bone Net (200M, highest luck) for hunting rare Exotic rolls on Undead Scorpion and Thousand Scorpion. Switch to Scorpion Net (250M) if you need the weight capacity to capture Secret Tomb Swarm groups.

Lure pairing

Sandstorm Lure during active Sandstorm weather (stacks with luck on desert-adjacent cave bugs). No lure is confirmed to specifically boost Secret Tomb spawn rates — general luck lures still apply.

Farming rotation tip

After buying the Bone Net, run a loop between the Secret Tomb spawns and the vivarium. Undead Scorpion and Thousand Scorpion are top vivarium income bugs — deposit regularly rather than carrying a full stack.

When to move on from the Secret Tomb

The Secret Tomb spawns are strong but fixed — Undead Scorpion, Thousand Scorpion and Secret Tomb Swarm. Once you have maxed vivarium slots on these three, rotating to the Desert zone (Colossal Sandworm with Sandstorm Lure + Scorpion Net) can add vivarium variety and income. The Blossomwing zone, unlocked after Jewel Jungle, is the latest endgame destination — Hikaru NPC there sells the Bamboo Net (220M, 14,000%+ luck) and Blossom Net, which offer the best luck stats in the Blossomwing biome.

Pre-Secret-Tomb preparation checklist

  • Have at least a Royal Net or higher before farming the three key bugs — you need a reliable catch rate on Exotic-rarity bugs
  • Keep all three key bugs in your active inventory — do not sell, store or donate them before entering
  • Catch the Spiny Harvestman last since it's already in Dune Burrow, next to the tomb entrance
  • Unlock vivarium upgrades to bank offline cash for the Bone Net (200M) while you're grinding
  • Save up 200M cash before you enter — Anpu only sells the Bone Net, and you want to buy it immediately after unlocking

Common Secret Tomb mistakes to avoid

  • Selling the Crescent Wing Butterfly because of its high sell value — you need it in your active inventory
  • Trying to enter Moon Hollow before in-game 6:30 PM and never seeing the Crescent Wing Butterfly spawn
  • Donating one of the three key bugs to Critterpedia — the rune wall only reads active inventory
  • Trying to buy the Bone Net before unlocking the tomb — Anpu only appears inside the Secret Tomb
  • Forgetting to save 200M cash before entering — grinding for the Bone Net after unlock is slower

Where the Secret Tomb fits in Catch Bugs progression

The Secret Tomb sits between the mid-game cave grind and the endgame desert and Blossomwing zones. By the time you can comfortably farm all three key bugs, you should already have a Royal Net and a stocked vivarium.

  1. Mid-game — Deeproot Caves, Hellfire Net (2.4M, Axel in Crawwood), Black Hole Net (12M, Zak in Deeproot Caves)
  2. Late-game — Dark Matter Net (35M, Zak), Dreamcatcher Net (23.5M, Josh in Jewel Jungle)
  3. Secret Tomb unlock — Save 200M, farm three key bugs, buy Bone Net from Anpu inside the tomb
  4. Post-tomb — Scorpion Net (250M) for heavy catches in Desert; Cactus Net (75M) or Steampunk Net (140M) from Billy in Dune Burrow
  5. Blossomwing endgame — Bamboo Net (220M) or Blossom Net from Hikaru in Blossomwing zone, best luck in the latest endgame biome needs_check

Not sure which net to buy next after the Bone Net? See the full best net in Catch Bugs Roblox comparison — Bone Net vs Scorpion Net vs Bamboo Net, stats, costs and where to buy each one. For the full zone map with every NPC route, see Catch Bugs locations. Looking for the full Catch Bugs bug list? All confirmed species, rarities and locations.

Catch Bugs Secret Tomb — FAQ

How do you unlock the Secret Tomb in Catch Bugs?
To unlock the Catch Bugs Secret Tomb, carry three key bugs in your active inventory at the same time — Crescent Wing Butterfly (Moon Hollow, after in-game 6:30 PM), Wasp Moth (Deeproot Caves, any time), and Spiny Harvestman (Dune Burrow) — then walk into the small rocky tunnel with glowing runes between the Potion Traders and the waterfall in Dune Burrow. With all three in your active inventory the Secret Tomb opens automatically.
What three bugs do you need to unlock the Secret Tomb in Catch Bugs?
The three Secret Tomb key bugs in Catch Bugs are: Crescent Wing Butterfly (Elusive — Moon Hollow, spawns only after in-game 6:30 PM), Wasp Moth (Exotic — Deeproot Caves, any time), and Spiny Harvestman (Elusive — Dune Burrow, near burrow entrances and rocky outcrops). You must carry all three in your active inventory simultaneously — not stored or donated to Critterpedia — when you walk into the Dune Burrow tunnel.
Where is the Secret Tomb entrance in Catch Bugs?
The Secret Tomb entrance is a small rocky tunnel with a glowing rune stone wall in Dune Burrow, located between the Potion Traders / net upgrade area and the waterfall. Walk toward the large rock next to the waterfall — the tunnel is in the nook between them. You must be carrying all three key bugs in your active inventory for the tomb to open.
What is the Bone Net and how do you get it in Catch Bugs?
The Bone Net is the highest-luck endgame net in Catch Bugs Roblox. It costs 200,000,000 cash and is sold exclusively by Anpu — an NPC inside the Secret Tomb. The Bone Net gives roughly 1,877 more luck than the Scorpion Net, making it ideal for hunting rare and Elusive bugs. To reach Anpu you must first unlock the Secret Tomb by carrying the three key bugs to the Dune Burrow tunnel. The Bone Net is not available from any other vendor.
What spawns inside the Secret Tomb in Catch Bugs?
Inside the Catch Bugs Secret Tomb you find the NPC Anpu (sells the Bone Net for 200M cash) and Exotic-tier spawn pools including Undead Scorpion, Thousand Scorpion, and Secret Tomb Swarm. These are endgame Exotic bugs that provide strong vivarium income. Bring the Bone Net (200M) for the best luck rolls on rare Exotic spawns, or the Scorpion Net (250M) if you need weight capacity for swarm groups.
How long does it take to unlock the Secret Tomb in Catch Bugs?
Farming all three key bugs typically takes 30 to 90 minutes depending on your current net and which biomes you have unlocked. The Crescent Wing Butterfly is usually the hardest to time because it only spawns after in-game 6:30 PM in Moon Hollow — you may need to wait through one full day cycle. The Wasp Moth in Deeproot Caves has no time restriction, and the Spiny Harvestman is already in Dune Burrow near the tomb entrance.
Can I store or donate the key bugs before entering the Secret Tomb?
No. All three key bugs — Crescent Wing Butterfly, Wasp Moth and Spiny Harvestman — must be in your active inventory when you walk into the Dune Burrow tunnel. If you donate any of them to the Critterpedia or place them in storage, the rune wall will not recognize the stack and the tomb will not open. The most common mistake is selling the Crescent Wing Butterfly for its high sell value before reaching the tomb.
What net should I use inside the Secret Tomb in Catch Bugs?
Use the Bone Net (200,000,000 cash, sold by Anpu inside the tomb) for the highest luck rolls on Undead Scorpion and Thousand Scorpion — both Exotic-tier bugs. Switch to the Scorpion Net (250,000,000 cash) if you need the higher weight capacity for capturing Secret Tomb Swarm groups. Most endgame players buy the Bone Net from Anpu immediately after unlocking the tomb, then switch between the two nets depending on which spawn type is active.

Secret Tomb unlock steps verified via ProGameGuides, GamesTouse and YouTube walkthroughs. Inventory rule (active inventory only, not stored or donated) consistent across all checked sources. Last checked 2026-06-23.