The UFO Key in Sell Lemons sits deep inside the sewer maze, and it only appears after you flip a set of colored levers in one precise order. Get the order right and the hidden path opens. Get it wrong, leave the game, or switch servers, and every lever resets, forcing a full restart.
What you need before starting the UFO Key puzzle
The UFO Key does not spawn for brand-new players. You must first progress far enough in the main game to unlock the investor interactions. If you attempt the lever puzzle too early, you can reach the correct spot and still find no key waiting there.
Because the entire sequence resets if you leave, plan to finish it in one sitting. Do not close the game, get disconnected, or hop to a different server partway through, or you start the lever chain again from zero.
How to enter the sewers in Sell Lemons
Step 1: Head to the main street in the game and look for any manhole. There are several scattered along the road.
Step 2: Stand directly over a manhole. You drop straight through and land inside the sewer network.
Step 3: Use the center of the sewer near the two scoreboards as your reference point. Returning here between levers makes the maze far easier to navigate.
UFO Key lever order in the sewer maze
The colored levers are spread across different parts of the maze. The Blue and Red levers can be activated at any time, but the Green and Purple levers only become reachable when you follow the chain correctly. The repeated Red Lever pulls are the part most players miss, since they assume each lever is used only once.
| Step | 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 |
Follow this list top to bottom without skipping or reordering. Pulling levers out of sequence can lock progression until everything resets, so confirm each pull before moving to the next one.
How to find and collect the UFO Key
Once the full lever sequence is complete, the hidden pathway to the UFO Key becomes available inside the maze. Walk to the key and interact with it to pick it up. You will know it worked because the UFO Key is added as a permanent progression item tied to the secret UFO section of the map.
If you reach the expected location and see nothing, the most common cause is that you have not unlocked the investors yet. The second most common cause is a broken lever order. Recheck the sequence above before trying again.
How to unlock the Good Samaritan Badge
The UFO Key is only half of the reward. The badge comes from an alien NPC hidden deeper in the same maze, and his path stays sealed until you reopen it.
Step 1: Make sure the UFO Key is already in your possession. The alien's dialogue will not unlock without it.
Step 2: Return into the sewer maze and pull the Red Lever again, then the Green Lever again. This opens the route leading toward the alien.
Step 3: Walk to the alien and talk to him. The Good Samaritan Badge unlocks immediately once the conversation begins.
With the badge claimed and the investor bonus upgraded, your future runs and rebirths pay out faster, which is why many players treat the UFO Key and the Good Samaritan Badge as priority unlocks in Sell Lemons.