Sell Lemons Sewer Key and UFO Key Locations (Roblox)

Sell Lemons hides two of its biggest secrets beneath the main street. The Sewer Key opens the tunnel network under the map, and the UFO Key sits deeper inside that maze behind a strict lever puzzle. Both reward you with progression badges, and both punish any mistake by resetting the puzzle from the start.

How to get the Sewer Key in Sell Lemons

The Sewer Key unlocks access to the tunnels beneath the main map and counts toward the Cosmic Farmer badge. Without it, the sewer entrance stays sealed and you cannot move into the corridors below. Getting it comes down to dropping through a manhole and clearing a short lever chain.

Step 1: Head to the edge of the lemon-selling zone and look for a circular manhole-style hatch on the ground. It sits slightly off to the side rather than in the central hub, where the ground texture changes. Stand over it to fall through into the tunnels.

Step 2: Walk straight through the opening corridor until the path splits, then take the left route. The right path dead-ends at a locked gate that only opens later once the full lever chain is done.

Step 3: Follow the left corridor to the first lever mounted on the wall and activate it. A movement and sound cue confirms it registered, and a new path opens ahead. Continue forward rather than backtracking.

Step 4: Wind deeper through the next turns to the second lever and pull it. This opens a previously blocked section leading toward the colored levers.

Step 5: Pull the green lever and wait for the gate it controls to swing open. If nothing moves, return and confirm the first two levers are both in the active position before trying again.

Step 6: Move through the gate the green lever opened, reach the purple lever in the deepest part of the tunnels, and pull it. This unlocks the final room holding the Sewer Key.

Step 7: Walk into the newly opened space and interact with the key to add it to your inventory. Check your badges menu to confirm the Cosmic Farmer badge registered.

UFO Key lever order in Sell Lemons

The UFO Key is the prize at the end of a longer lever sequence inside the same sewer maze. The catch is the repeated Red Lever pulls, which trip up most players who assume each lever should only ever be flipped once. The levers must be hit in the exact order below, and leaving the game or switching servers resets every one of them.

The Blue Lever is the first in the chain and can be reached without any setup, so just enter the sewers and pull it. The Red Lever can also be activated at any point, which is why it appears so often in the sequence. The Green and Purple levers are gated, so they only become accessible if you have followed the order precisely up to that point.

Where to find the UFO Key

Once the full eight-step lever order is complete, the hidden pathway to the UFO Key opens inside the maze. There is one extra requirement that often catches people out. The key only becomes visible after you have progressed far enough in the main game to unlock the investor interactions.

If you attempt the puzzle too early, you can reach the correct spot and find nothing there because the key has not spawned yet. Make sure you have unlocked and spoken to the investors first, then run the lever sequence. The UFO Key is a permanent progression item tied to the secret UFO section of the map.

How to unlock the Good Samaritan Badge

Collecting the UFO Key is only the first half of this secret. The badge itself comes from a hidden alien NPC tucked away in the maze, and its dialogue stays locked until you are holding the key.

Step 1: With the UFO Key already in your inventory, return into the sewer maze.

Step 2: Pull the Red Lever and then the Green Lever once more. This opens a fresh route leading toward the alien.

Step 3: Follow the opened path and talk to the alien to immediately earn the Good Samaritan Badge.

Earning the badge doubles your Investor Bonus, raising it from 1% to 2%. That makes it worth chasing beyond badge collection, since the boost directly improves long-term Cosmic Cash progression.

Common reasons the puzzle fails

Most failed runs come down to a handful of repeatable mistakes. The lever chain is unforgiving, so a single misstep usually means starting over.

Work through the Sewer Key first, then commit to the UFO Key sequence in one uninterrupted run. With the investors unlocked and the levers pulled in order, both keys and the Good Samaritan Badge are yours in a single trip through the tunnels.