In this mission, you play on a track that is similar in appearance to Monkey Lane, but with a different design. In the middle of the track there is a Monkey Village upgraded to Monkey Town. The player's goal is to stop the Bloons from hitting the Monkey Village in the middle of the track. Every time the Monkey Village gets hit by a bloon, a life is lost. All bloons are +1, so reds are blues, blues are greens, greens are yellows, yellows are pinks, pinks are blacks, blacks are whites, whites are Leads, Leads are Zebras, Zebras are Rainbows, Rainbows are Ceramics, and you must beat it on Medium. This does not affect Ceramics and above (Ceramics are still Ceramic, M.O.A.B.s are still M.O.A.B.s, B.F.B.s are still B.F.B.s, Z.O.M.G.s are still Z.O.M.G.s.)
If you click on the Monkey Village in the middle and the round ends, the "Sell" button will appear. It will say "Sell for $0" and increase with every upgrade. You can't click the button.
This will also happen if it has been upgraded to High Energy Beacon and pops a bloon.
The same goes for Wizard Lord in the Special Mission Wizard Lord.
Under the influence of the Bigger Beacons premium upgrade, leaving the Monkey Town as it is will let the entire track receive the towers effects. Upgrading it at all will set the range right back down.
Sometimes, you can actually sell the Monkey Town for $0 in BTD5 iOS, leaving a hole in the middle. You will still lose lives if bloons get away though.