How to Get the UFO Key in Sell Lemons
The UFO Key permanently doubles your Investor Cash Bonus from 1% to 2%. Here's the exact lever puzzle solution, the Good Samaritan Badge walkthrough, and every step to unlock this game-changing reward.
Last updated: June 6, 2026
Overview
The UFO Key is one of the most valuable items in Sell Lemons because it permanently doubles your Investor Cash Bonus from 1% to 2% per Investor. This means every Investor you accumulate becomes twice as powerful — an exponential boost that compounds with every Ascend. The UFO Key is obtained through a lever puzzle in the Sewer Area after earning the Good Samaritan Badge. This guide covers the complete chain from Sewer Key to UFO Key.
Prerequisites
Before attempting the UFO Key, you need: (1) Sewer Key — purchased with Cosmic Cash after earning the Cosmic Farmer Badge, (2) Access to the Sewer Area, (3) Solve the Sewer lever puzzle first (7-step sequence), and (4) Talk to the stranger (alien NPC) inside the Sewer after solving the Sewer puzzle. Typically accessible after Ascend 50-100.
Good Samaritan Badge — Complete Walkthrough
The Good Samaritan Badge is required to unlock the UFO Key. Here's the exact sequence:
UFO Key Lever Puzzle Solution (8 Steps)
After earning the Good Samaritan Badge, you'll encounter a second lever puzzle. Here's the exact 8-step sequence (verified by FFBooyah and Mr $TARK, June 2026):
Follow the exact sequence. The UFO Key puzzle has 8 steps (different from the Sewer's 7 steps).
Unlike the Sewer puzzle, every step in the UFO Key puzzle is a PULL — no unpulling required.
You MUST talk to the alien NPC in the Sewer first to get Good Samaritan Badge, or the UFO lever puzzle won't work.
Investor Bonus: 1% → 2%
The UFO Key's reward is permanent and massive: each Investor you accumulate gives a cash bonus. Without the UFO Key, each Investor gives +1%. With the UFO Key, this doubles to +2% per Investor. If you have 100 Investors, that's 100% → 200% bonus! This is the single most impactful permanent upgrade in the game because it scales with your Investor count forever.
Key Locations
Important spots in the UFO Area:
UFO Landing Pad
The main entrance area. The UFO hovers above — the visual centerpiece of the zone. Teleport here after unlocking the area.
Alien Market
Exclusive alien vendors offering unique deals and items. These may include rare upgrades, Cosmic Cash bonuses, and endgame progression items.
Cosmic Vault
A special vault area with endgame rewards. May contain items needed for Purity Fruit progression and 100% completion.
Good Samaritan Shrine
Connected to the Good Samaritan Badge quest. A thematic location that may offer additional rewards or lore.
Tips & Strategy
Get the Good Samaritan Badge by talking to the alien NPC in the Sewer BEFORE attempting the UFO lever puzzle.
UFO is smaller than other zones but packed with valuable content. Don't rush through — examine every corner.
Keep a Cosmic Cash reserve even after buying the UFO Key. The Alien Market may have items worth purchasing.
Alien NPCs in this area may offer enhanced deals compared to surface Aliens. Answer every call.
The UFO Key should be one of your highest-priority goals. Doubling Investor Bonus is a permanent, scaling upgrade that only gets more valuable over time.