I remember standing under the sewer’s flicker, hearing other players call out directions while I hesitated at the first corridor. You feel the map tighten around you—one wrong turn and the puzzle resets. I pulled the blue lever and everything snapped into place, slowly revealing the route to the UFO Key.
How to Get the UFO Key in Sell Lemons
You can spot the Most Cash leaderboard at the sewer’s center, which acts as the map’s compass.
If you want the UFO Key, you have to flip levers in a precise order and then thread a hidden path in the blue lever maze. The sequence below is the single fastest route that players on Roblox Discord and YouTube guides consistently use (Moyens I/O’s images helped me map it cleanly).
- Pull the blue lever
- Pull the red lever
- Pull the green lever
- Unpull the red lever (toggle it back)
- Pull the purple lever
- Pull the red lever again
- Unpull the green lever
- Unpull the red lever
- Grab the UFO Key
Blue lever: where to start and how to sprint out
The Most Cash board sits under a dripping ceiling—use it as your starting landmark.
The blue lever opens the whole run. Go opposite the Most Cash board, find the green text on the wall, and take that entry. At the first intersection take the second right, follow the corridor past a green line on the left, then ignore the right fork after the red line and take the left. Interact with the lever with E, then respawn to return quickly to the sewer entrance. The sewer maze is like a pocket watch—each lever a tiny cog.
Red lever: the quick win in the center
The jail by the Most Fruits board is an unmistakable marker—walk past it to find the red maze entrance.
The red lever is the simplest stop: follow the main straight path through the maze (side corridors are dead ends), flip it, then respawn back to the center.
Green lever: the left-first rule that matters
A painted green line near the Most Cash area marks the green lever’s entry—it’s only a short walk from the center.
Head down, take the first left, then a right. Continue past the red and blue lines, and favor left-side passages. When you reach a corridor with three options (right, left, farther left), take the first right to find the green lever. Flip it, then respawn to the center.
Deactivate red, pull purple, cycle again
You’ll notice the corridors repeat patterns—use them to memorize the purple path.
After the green lever, go back and deactivate the red lever (toggle it off). Then enter the purple lever entry from the opposite side of the blue lever entry by following the green text on the wall. Take left then right; ignore the second red-line path and instead take the left that crosses a green line to reach the purple lever. Flip it and respawn to the center.
Repeat toggles to open the final route
The maze behaves like a simple circuit—you’ll be toggling switches in short order.
Respawn and activate the red lever again, then go back to the green lever and unpull it. Finally, deactivate the red lever one last time. That final combination clears the hidden doorway into the blue maze where the UFO Key waits.
Sell Lemons UFO Key location inside the blue maze
The blue lever corridor has a distinctive sequence of colored lines on the walls—track them closely.
Enter the blue path and at the first green line take the left instead of going straight. Cross that green line again, walk until you see a blue line, cross it, then cross a purple line and you’ll find the UFO Key sitting in a corner.
Do I need to restart the game before doing the UFO Key route?
If you already pulled the Sewer Key levers, restart the server—this resets all lever states and gives you a clean run. Many players use respawn after each lever to save time getting back to the entrance.
What does the UFO Key do in Sell Lemons?
Use the key only after you’ve toggled red and green as described. Then follow the green lever path again and take two lefts; a door opens to reveal an alien. Interact with it and you get a permanent +2% cash per investor, plus the Good Samaritan Roblox badge. Finding the key feels like untangling a string of holiday lights.
How to use the UFO Key and claim the rewards
The green path has a faint pattern of lefts—count them to avoid backtracking.
After the correct lever state, run the green lever path, take left, left; the door will be open and an Alien NPC will be waiting. Talk to it to collect the permanent cash bonus and the badge. Players on YouTube and Discord often post timestamps for the exact paths if you want a visual walkthrough.
Ready to flip the final switch and add +2% per investor to your returns—are you going for it?