If you are exploring the sands of Duneburrow in Catch Bugs on Roblox and want to uncover the mysteries of the hidden desert, the Secret Tomb should be your next objective. I spent hours tracking down the exact bug locations and figuring out the rune puzzle so you do not have to. This guide covers every detail you need: where to find the tomb, which three bugs you must catch, and exactly how to unlock the stone entrance. By the end, you will know how to unlock the Secret Tomb in Catch Bugs and claim the rewards hidden inside.
The Secret Tomb sits inside the Duneburrow biome, which is the desert area in Catch Bugs. You will find the entrance along the tunnel that runs between the Cell Area and the Net Area. Walk through that connecting corridor and look for a stone wall covered in faintly glowing rune markings. That wall is the tomb entrance.
When you first arrive, the rune wall will be inactive. The markings stay dim until you have all three required bugs sitting in your inventory. If the runes are not glowing, you have not collected the right bugs yet. Do not worry — I break down each bug location in detail below so you can grab them all and come straight back.
One important detail: the tomb entrance does not show up as a map marker for most players. You need to physically walk through the tunnel between Cell Area and Net Area to spot it. Keep your eyes on the walls as you move through.
Unlocking the Secret Tomb in Catch Bugs comes down to one simple mechanic: the rune puzzle. The stone wall at the tomb entrance has three rune slots that correspond to the three bugs you need to catch. Once all three bugs are in your inventory at the same time, approach the wall and the runes will begin to glow. The wall then slides open, giving you access to the hidden desert area behind it.
Here is the critical part that trips up a lot of players. You must have all three bugs in your inventory simultaneously. If you catch one, sell it, then catch the next one, the rune wall will not activate. The game checks for all three at once. I recommend visiting the rune wall first to confirm it is there, then hunting each bug in order, and returning without selling anything along the way.
There is no specific order you need to follow when catching the bugs. You can grab them in any sequence as long as you hold onto every single one until you are standing in front of that rune wall.
Three specific bugs are required to open the Secret Tomb: the Crescent Wing Butterfly, the Spiny Harvestman, and the Wasp Moth. Each one spawns in a different area of the map, and their difficulty levels vary. Below I cover the exact location and catching strategy for each.
The Crescent Wing Butterfly spawns in the Moon Hollow area of Catch Bugs. Moon Hollow is one of the greener, more forested biomes on the map. Head there and look through the grassy, open sections where trees thin out. The butterfly tends to appear near the edges of wooded areas rather than deep inside dense tree clusters.
This is the easiest of the three bugs to catch. A basic starter net works fine. The Crescent Wing Butterfly has a distinctive crescent-shaped marking on its wings, so once you spot it, approach slowly and time your swing. It does not move particularly fast, giving you multiple attempts if you miss on the first try.
Spawn rates for the Crescent Wing Butterfly in Moon Hollow are fairly generous. If you do not see one right away, walk around the area for a minute or two. It typically respawns within a short cycle, so patience pays off here.
The Spiny Harvestman is the hardest bug to catch of the three. It lives inside the Cave system in Catch Bugs. The Cave biome is dark, cramped, and the bug itself moves faster than the other two. You will find the Spiny Harvestman patrolling specific tunnel sections between rock formations. It favors the narrower corridors rather than the open cavern spaces.
Before you attempt this catch, I strongly recommend upgrading your net. A better net gives you a larger catch radius and faster swing speed, both of which make a huge difference in the confined cave tunnels. Without an upgrade, you may find yourself chasing the Spiny Harvestman through tight passages for a long time with nothing to show for it.
When you spot the Spiny Harvestman, watch its patrol pattern for a few seconds. It tends to loop along the same stretch of tunnel. Once you recognize the pattern, position yourself at a point along that loop and wait for it to come to you rather than chasing it. This strategy saves time and reduces frustration.
Spawn rates for the Spiny Harvestman in the Cave can be slower than the Crescent Wing Butterfly. If the tunnel sections feel empty, exit the Cave briefly and re-enter. This can trigger a fresh spawn cycle and improve your chances.
The Wasp Moth spawns in the open areas scattered throughout the map, including the Duneburrow swarm area and nearby open zones. It is a moderate-difficulty catch, sitting right between the easy Crescent Wing Butterfly and the challenging Spiny Harvestman.
Look for the Wasp Moth flying above ground level in open spaces. Unlike the Spiny Harvestman that hugs the ground in caves, the Wasp Moth flies at a slight altitude. You need to time your net swing as it passes overhead. Watch its flight pattern for a moment before committing to a swing. It follows a somewhat predictable path, dipping and rising as it circles an area.
A standard net works for the Wasp Moth, but an upgraded net gives you more margin for error. The key is patience. Let it complete one full flight loop so you can anticipate where it will be, then swing slightly ahead of its current position. Leading your swing by a small margin accounts for the time between clicking and the net closing.
The Wasp Moth tends to spawn more frequently during certain in-game cycles in the Duneburrow area. If it seems rare in one spot, try moving to a different open area nearby. It often relocates to adjacent zones rather than despawning entirely.
Once the rune wall slides open and you step through, you enter a hidden desert area that most Catch Bugs players never see. The Secret Tomb contains high-tier bug spawns that do not appear anywhere else in the game. These are rare, valuable bugs that can sell for significantly more than standard catches.
Beyond the rare bugs, the hidden desert holds unique rewards. Players report finding exclusive collectibles and special items inside the tomb that are tied to progression milestones. The area itself is also visually distinct from the rest of Duneburrow, featuring unique terrain and atmosphere worth exploring even after you have caught everything available.
If you want the quick version without all the detail, here is the entire process condensed into a numbered list:
Do not sell any of the three required bugs before the tomb opens. The rune wall checks your inventory for all three at the same time. If even one is missing because you sold it, the wall stays shut. This is the single most common mistake players make, according to community discussions on Reddit and TikTok.
Upgrade your net before heading into the Cave for the Spiny Harvestman. The confined space and the bug’s speed make it nearly impossible with a starter net. Spend a little time catching and selling other bugs first to afford the upgrade.
Visit the rune wall first before you start collecting bugs. Confirming the tomb location early saves you from wandering the Duneburrow dunes later with a full inventory trying to remember which tunnel the entrance was in.
Be patient with the Spiny Harvestman. It is the gatekeeper bug that stops most players from completing this puzzle. Study its patrol loop, position yourself along that path, and wait for it to come to you.
The Secret Tomb is located in the Duneburrow biome, inside the tunnel that connects the Cell Area to the Net Area. Look for a stone wall with glowing rune markings along that corridor.
You need three specific bugs: the Crescent Wing Butterfly (found in Moon Hollow), the Spiny Harvestman (found in the Cave system), and the Wasp Moth (found in open areas near Duneburrow). You must have all three in your inventory at the same time.
Yes. Once the rune wall opens and you step inside the hidden desert, the game has already checked your inventory. You are free to sell the Crescent Wing Butterfly, Spiny Harvestman, and Wasp Moth after entering the tomb.
It is not strictly required but it is highly recommended. The Spiny Harvestman moves fast through narrow cave tunnels, and a basic net has a small catch radius and slow swing speed. An upgraded net makes this catch significantly easier.
Inside the Secret Tomb you will find high-tier bug spawns that do not appear anywhere else in the game, along with exclusive collectibles and special items tied to progression milestones. The hidden desert area also features unique terrain worth exploring.
Learning how to unlock the Secret Tomb in Catch Bugs comes down to catching three specific bugs and bringing them to the rune wall in Duneburrow. Grab the Crescent Wing Butterfly from Moon Hollow, hunt down the Spiny Harvestman in the Cave, and snare the Wasp Moth in the open areas. Hold onto all three, walk up to that stone wall, and the hidden desert is yours to explore. Good luck out there, and enjoy the rare catches waiting inside the tomb.
