Roblox Game
Sell Lemons Sewer Secrets
Sewer maze lever codes for the Sewer Key and UFO Key, Cosmic Vine harvest timing, and why you should rejoin between keys.
By Bloxron Editorial Team · Last updated
Open the locked manhole outside your fence to enter the Sewer Maze. Everything below is inside that maze. For the full layout and numbered routes, see the sewer map.
Important: rejoin between keys
Doing the Sewer Key and UFO Key back-to-back in the same server can bug the levers (stuck up or down). Leave and join a new server before starting the second key.
Cosmic Vine (Sewer Key)
- You can walk the maze to the vine without a key — it just takes longer
- The Sewer Key unlocks a shortcut gate permanently
Sewer Key lever order
Blue ON → Red ON → Green ON → Red OFF → Blue OFF → Purple ON → Red ON
Cosmic Vine harvest
Harvest the Cosmic Vine for a big cash payout. You can do this once every 4 hours (real time).
UFO Key
UFO Key lever order
Join a fresh server, enter the maze, then flip levers in this order:
Blue ON → Red ON → Green ON → Red OFF → Purple ON → Red ON → Green ON → talk to Homeless Alien → Green OFF → Red OFF → key → Red ON → Green ON → alien again
Requires rebirth. Full 14-step list on the map page.
Reward: permanent 2x cash per investor. This helps a lot when pushing toward the +32% max per investor on the rebirth page.