How to Get UFO Key in Sell Lemons – Complete Sewer Lever Guide

What This Guide Helps You Do#

This guide walks you through every step needed to obtain and deliver the UFO key in Sell Lemons, unlocking a trade with the alien NPC and earning an investor boost. You’ll want this if you’re aiming to maximize your Sell Lemons economy and unlock all quest lines. It’s best for players who’ve already secured at least one alien investor and are ready to tackle the sewer puzzle sequence.

Requirements & Prep#

Critical requirement: You must have completed at least one alien investor transaction before attempting this guide. Without an alien investor, the UFO key won’t spawn in its location, and you’ll waste time on the maze sequence.

Beyond that, you just need the ability to navigate the Sell Lemons sewer system. No special items, tools, or loadout required. The sewers are a puzzle-based environment, not a combat zone.

Route Overview#

The UFO key quest is a multi-stage sewer puzzle that requires you to pull five different levers in a specific sequence, with some levers needing to be pulled multiple times. Each lever is guarded by a maze—you navigate to the lever, pull it, reset your character, and move to the next stage. The sequence is: Blue → Red → Green → Red (unpull) → Purple → Red (repull) → Green (repull) → Red (repull) → Green (repull). After completing this lever sequence, you’ll unlock a special path to the UFO key spawn location, collect it, and then navigate to the alien NPC to deliver it. The whole process is navigational and requires patience and attention to the maze paths.

Step-by-Step Walkthrough#

Step 1: Locate and Enter the Sewer#

Start at the spawn area in Sell Lemons. Look for the green text marker that indicates the sewer entrance—this is your gateway to the entire UFO key puzzle. Head toward this marker and enter the sewer system. You’ll know you’re in the right place when you see the maze-like corridors and the first lever area ahead.

Step 2: Navigate to and Pull the Blue Lever#

The blue lever entrance is marked by green text. Once you’re in, you’ll enter a maze. Follow this path: go forward into the maze area, make the first turn, then another turn. Continue forward and you’ll see a red and purple marker ahead. Keep going straight past it, then turn. Follow the winding path forward, continuing straight until you reach the blue lever. Pull it.

After pulling the blue lever, reset your character immediately. It’s the fastest way to exit and return to the spawn area for the next stage.

Step 3: Navigate to and Pull the Red Lever#

Return to the spawn area. The red lever entrance is marked by a small cage structure—that’s how you’ll identify it. Head to this location. The red lever maze is the simplest of all the lever mazes; there’s essentially only one path forward. Follow it and you’ll reach the red lever quickly. Pull it.

Reset your character again and return to spawn.

Step 4: Navigate to and Pull the Green Lever#

From spawn, head toward the area with the pipes. This is the green lever entrance. Enter the maze and follow this path carefully: run forward, then to the side, following the path as it winds. You’ll cross over blue lines at one point. Continue forward through the winding paths. At a cross-section, avoid the obvious straightaway (it’s a trap) and instead take the correct fork. Keep going forward through more winding paths until you see another straightaway. Turn and follow it. You’ll encounter another decision point; go the correct direction (straight ahead at the cross-section). Continue forward and you’ll reach the green lever. Pull it.

Reset your character.

Step 5: Return to Red Lever and Unpull It#

Go back to the red lever entrance (marked by the cage). Navigate the simple red maze again and this time, instead of pulling the lever, unpull it (interact with it again to reverse the action). It might seem counterintuitive, but it’s part of the puzzle sequence.

Reset and return to spawn.

Step 6: Navigate to and Pull the Purple Lever#

Head down the same alleyway with the green text that you used for the blue lever. Enter this maze. You’ll see two possible directions; take the correct one and continue forward. Go up the zigzag paths. You’ll encounter a red line; follow the path upward from there. Keep running forward. At another cross-section, choose the straightaway direction. You’ll see a green marker but continue past it. The purple lever is just ahead. Pull it.

Reset your character.

Step 7: Return to Red Lever and Repull It#

Go back to the red lever entrance. Navigate the maze again and repull the red lever.

Reset and return to spawn.

Step 8: Navigate to and Repull the Green Lever#

Head to the green lever entrance (the area with pipes) again. Follow the same path you took before: forward, to the side, across the blue lines, through the winding paths. At the cross-section, take the correct fork. Continue forward through the straightaway and decision point. Reach the green lever and pull it again.

Reset your character.

Step 9: Return to Red Lever and Repull It Again#

Go back to the red lever entrance. Navigate the simple maze one more time and repull the red lever. You should have this path memorized by now.

Reset and return to spawn.

Step 10: Navigate to the UFO Key Location#

This is the most complex maze of the entire sequence. Head to the green area marked on the map (same general entrance as the green lever, but you’re going for a different destination this time). Enter and follow this path carefully: walk into the entrance, turn and go the correct direction. Go straight and follow the path. You’ll see green, red, and green air markers; follow past them. Navigate through the path that opens up. At a decision point, go upward (not the other direction). Follow the blue marker, then the purple marker. Go the correct direction at the next fork. You’ll hit a dead end if you go the wrong way, so backtrack if needed and follow the correct path forward. Continue running forward and you’ll see the UFO key spawn location in the wall ahead. It’s easy to miss if you’re not careful.

Critical note: If you don’t see the UFO key here, you don’t have an alien investor yet. You must complete at least one alien investor transaction before the key will appear. If you see it, collect it.

Reset your character.

Step 11: Return to Red Lever and Repull It (Final Time)#

Go back to the red lever entrance and repull the red lever one last time.

Reset and return to spawn.

Step 12: Navigate to and Repull the Green Lever (Final Time)#

Head to the green lever entrance and follow the maze path one final time. You should be very familiar with it by now. Reach the green lever and pull it.

Reset your character.

Step 13: Navigate to the Alien NPC and Deliver the Key#

This is the final step. Head down the green lever path entrance again, but this time you’re not going to the green lever. Instead, follow a different route: go forward down the straightaway, turn into the next area, go around the corner. You’ll see a caged area ahead. This is where the alien NPC is located. Interact with the alien and give them the UFO key. You’ve completed the quest and earned the investor boost.

Troubleshooting & Common Mistakes#

• UFO key won’t spawn: You don’t have an alien investor yet. Complete at least one alien investor transaction before attempting this quest.
• Getting lost in the green lever maze: The green maze is the trickiest. At the cross-section, always go the direction that isn’t the obvious straightaway. Mark or remember the decision points and practice the route a few times.
• Forgetting the lever sequence: Write down or screenshot the order: Blue → Red → Green → Red (unpull) → Purple → Red (repull) → Green (repull) → Red (repull) → Green (repull). Refer to it between resets.
• Missing the UFO key location: The key spawns in a wall and is very easy to miss. Keep your eyes on the path ahead as you approach the end of the UFO key maze. It’s literally embedded in the wall structure.
• Pulling the wrong lever: Each lever entrance has a distinct marker or location. Red = cage structure. Green = pipes area. Blue = green text entrance. Purple = green text entrance (different path). Learn these landmarks.
• Wasting time on wrong paths: If you hit a dead end, backtrack immediately and try the other direction. The mazes have only one correct path forward.

Advanced Tips & Time Saves#

FAQ#

Do I need an alien investor to get the UFO key in Sell Lemons?#

Yes, you must have at least one alien investor before the UFO key will spawn in its location. Without an alien investor, you can complete the entire lever sequence, but the key won’t appear when you reach its spawn point. Complete at least one alien investor transaction first.

What’s the correct order of levers to pull for the UFO key quest?#

The exact sequence is: Blue → Red → Green → Red (unpull) → Purple → Red (repull) → Green (repull) → Red (repull) → Green (repull). Some levers are pulled multiple times, and some are unpulled (reversed) in the middle. Follow this order strictly.

Where do I find the UFO key in the sewers?#

The UFO key spawns in a wall location at the end of the most complex maze (the UFO key maze, accessed via the green area). It’s embedded in the wall structure and very easy to miss if you’re not paying attention. Look carefully as you approach the end of the maze path.

How do I get to the alien NPC to deliver the UFO key?#

After collecting the UFO key and completing the final lever sequence, head down the green lever path entrance and follow a different route than you normally would: go forward down the straightaway, turn into the next area, go around the corner. You’ll see a caged area where the alien NPC is waiting. Interact with them to deliver the key.

Is the red lever maze the easiest?#

Yes, the red lever maze is the simplest of all the lever mazes because there’s essentially only one path forward. There are no trick turns or false paths. Use it as a warm-up or mental break during the longer sequence.

What should I do if I hit a dead end in a maze?#

Backtrack immediately and try the other direction at your last decision point. Each maze has only one correct path forward. If you’re consistently hitting dead ends, slow down and follow the path more carefully, paying attention to which direction the maze is leading you.

CHECK LIST (Screenshot This)#

• Prerequisite: Must have 1+ alien investor or UFO key won’t spawn.
• Lever sequence: Blue → Red → Green → Red (unpull) → Purple → Red (repull) → Green (repull) → Red (repull) → Green (repull).
• Red lever: Simplest maze, marked by cage structure.
• Green lever: Most complex, marked by pipes area. Avoid the obvious straightaway at cross-sections.
• Blue lever: Accessed via green text entrance, medium difficulty.
• Purple lever: Accessed via green text entrance (different path from blue), medium difficulty.
• UFO key location: Hidden in a wall at the end of the UFO key maze. Easy to miss.
• Alien NPC location: Caged area accessed via the green lever path entrance, but taking a different route than the lever itself.
• Reset strategy: Always reset your character to exit mazes quickly and return to spawn.
• Common mistake: Forgetting the lever sequence or getting lost in the green maze. Write down the order and practice the green maze route.
• Final step: After collecting the UFO key and completing the lever sequence, deliver it to the alien NPC to complete the quest and earn the investor boost.

Source & credit#

This guide draws on the excellent video walkthrough by Cocajola — watch it for the full visual run-through, and give the creator your view:

https://www.youtube.com/watch?v=Wilq37Abpkk