Chop Chop Inc: How to Unlock the Secret Dev Room Achievement

The secret developer room in Chop Chop Inc sits behind a hidden door at the back of the tunnel that also leads to the mine, close to the Woodman Corp wooden building. Walking through the door with the right tool pops the Steam achievement “You found our secret base.” The catch is that the door only gives way to the Stone Axe, so you need to finish an early crafting chain before the room becomes reachable.

Quick answer: Craft the Stone Axe (bridge → windmill clogs → pink-leaf Stone Wood → grindstone upgrade), then go to the tunnel near the start, walk into the pitch-black section at the back, turn right, reach the traffic cone, turn left, and hit the door with the Stone Axe to enter and unlock the achievement.

What you need before the door will open

Treat this as a tool problem first. The starter Wooden Axe will not break the hidden door, so seeing the door without the Stone Axe only costs you a return trip. The Stone Axe is gated behind a short sequence of early progression steps rather than any late-game area, despite how “secret dev room” sounds.

Requirement	How you get it
Bridge across the water	Build it as part of opening progression
Clogs (walk on water)	Repair the windmill to receive them
Stone Wood	Cross to the island with the pink-leaf Stone Tree and chop it
Stone Axe	Upgrade the Grindstone, then craft the axe

Craft the Stone Axe

Build the bridge across the water so you can move past the starting area. This is standard early progression and does not require any special tools.

Repair the windmill. Fixing it rewards you with the Clogs, which let you walk on the water surface. Confirm you can actually stay on top of the water before heading out, because sinking means the windmill reward is still missing.

Walk across the water to the island with the pink-leaf Stone Tree and collect Stone Wood there. The pink leaves are the cue that you have the right tree. Ordinary nearby lumber will not give you the material you need.

Chop Chop Inc Stone Axe 1 — Chopping the pink-leaf Stone Tree yields the Stone Wood needed for the Stone Axe.

Speak with Sir Worcestershire III to upgrade your Grindstone. Once the Grindstone has the required upgrade, craft the Stone Axe. Reaching the island only proves the Clogs step is done, so make sure the axe itself is actually crafted before you head to the tunnel.

Find the secret dev room in the tunnel

Head to the tunnel near the starting entrance, the same passage that gives access to the mine. Do not turn this into a search of Snowy Mountain or the deep mines. The room is here, gated only by the Stone Axe and by knowing where to turn.

Chop Chop Inc Secret Dev Room Location 1 — The tunnel near the Woodman Corp wooden building leads to the hidden door.

Walk to the very back of the tunnel. It looks like it ends in a solid pitch-black wall, but that dark section is not actually a wall. Step slightly into the black area before you change direction, and use that dark transition as your reset point.

Chop Chop Inc Secret Dev Room Location 2

From inside the black area, turn right and keep walking until you see a traffic cone. Walk all the way up to the cone rather than checking the walls the moment it comes into view.

At the cone, turn left toward the door (the cone acts as a pivot, not a marker beside the entrance). Equip the Stone Axe and strike the door to open it, then walk inside.

Chop Chop Inc Secret Dev Room Location 4 — At the traffic cone, turn to the door and break it open with the Stone Axe.

How to confirm the achievement unlocked

Stepping across the threshold into the developer room is what triggers “You found our secret base” on Steam. Door visibility alone does not count, so you must actually enter the room for the achievement to register. Make sure the game is connected to Steam so it pops on your profile.

Why the door won’t open

Problem	Fix
Door is visible but won’t break	You still have the Wooden Axe equipped; craft and equip the Stone Axe
No door appears at all	Reset from the black section, then enter darkness → turn right → reach the cone → turn
Achievement did not pop	You saw the door but did not step inside; walk fully into the room

Note: if you are searching the bright part of the tunnel entrance, you are in the wrong spot. The turn only works from the dark section deeper in the passage.

What’s inside the developer room

The first area holds eight hand gestures and a hamster sprinting on a wheel. It is a straightforward set of easter eggs with nothing you need to interact with for the unlock.

Chop Chop Inc Secret Dev Room Location 5

The next room has a single tree that cycles through every type when you hit it. It starts as an apple tree and shifts to walnut, then birch, metal tree, electric tree, palm tree, stone tree, crystal tree, and back to apple. The Golden Axe works well for cycling it quickly.

Chop Chop Inc Secret Dev Room Location 6

The main room is packed with references, including an axe named Chopper that you can grab. Keep in mind Chopper carries a Stamina -20 effect, so it is more of a novelty pickup than a practical everyday tool.

Chop Chop Inc Secret Dev Room Location 10 — The Chopper axe carries a Stamina -20 penalty.

You will also see a set of computers and the developers themselves floating in balloons, each labeled with a name: Kathy, Wolfgang, Daniel, Felix, Paul, and Sebastien. It is a small behind-the-scenes tribute rather than a gameplay reward, and once you have stepped inside, the achievement is already yours.