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.
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.
| Order | Lever |
|---|---|
| 1 | Blue Lever |
| 2 | Red Lever |
| 3 | Green Lever |
| 4 | Red Lever |
| 5 | Purple Lever |
| 6 | Red Lever |
| 7 | Green Lever |
| 8 | Red Lever |
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.
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.
| Problem | Fix |
|---|---|
| Levers reset mid-run | You left the game or changed servers. Stay in the same server for the whole sequence. |
| UFO Key not spawning | You have not progressed far enough to unlock the investors. Talk to them first. |
| A path stays blocked | A lever was pulled out of order. Recheck the full sequence and reset if needed. |
| Lever will not activate | Stand closer or shift your angle so the interact prompt appears, then try again. |
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.
