Monkeyopolis

"Absorbs all nearby Banana Farms and their income, freeing up space for new Monkeys."

- In-game description  is the final upgrade of Path 3 for the Monkey Village in BTD6. Once bought, it sacrifices all non-Tier 5 Banana Farms within its radius and in turn generates its own far superior income generation. Instead of having a single price, the cost increases for every Banana Farm in its radius. It cannot be bought in Deflation Mode and C.H.I.M.P.S. as Banana Farms are disabled by default, unless in a special challenge that enables Banana Farms.

It costs $5,000 per Farm regardless of difficulty, the $5,000 minimum being the cheapest Tier 5 upgrade cost in the game. However, a visual bug sometime displays incorrect prices (see Bugs). With only one Banana Farm in its radius, it is the only Tier 5 upgrade that has a base cost of less than $10,000.

Appearance
Monkeyopolis upgrades the building into a much larger, more developed town hall with two huts surrounding it. Both huts are located to the left side of the building (player's right side) and a large windmill is situated behind the building. The clock's outer rim is now gold and the clock hands change from sticks to arrows. The Monkeyopolis' clock in-game moves based on the device's time. Just like with Monkey City, on every fifth minute, the minute hand changes position, and the same applies to the hour hand.

Mechanics

 * The upgrade price increases by $5,000 with each Banana Farm in its radius.
 * The total income generated by the Monkeyopolis per round is one $300 crate every $2,000 spent on farms, including difficulty prices. It therefore has the highest roundly income potential on Impoppable. The value of each crate starts increasing if 10 crates are reached.
 * The Monkeyopolis will always produce at least one crate.
 * Monkeyopolis cannot absorb Tier 5 Banana Farms nor any Farms owned by a different player.

Statistics
TBA

Damage Types
TBA

Costs

 * Updated as of Version 29.4

Assumes a one-Farm Monkeyopolis. For other cost variants of Monkeyopolis, use the price of a x-x-4 Village and add the sum of nearby Farms multiplied by 5000.

Summary
While the sacrifice of all the Banana Farms is quite extreme given both the cost of the upgrade and the lost money that could have been reclaimed when selling each Farm individually, Monkeyopolis releases massive amounts of money. Not only does it increase farm production vastly, it is also able to comfortably compress up to 8-10 farms into the space of a single village's range. A second village and overclocking/ultraboosting the Monkey City can expand its range to fit in more farms upon upgrading to Monkeyopolis.

While most maps lack enough open space to place 8+ Farms, it is still extremely powerful with few farms sacrificed to it. The main issue with Monkeyopolis comes with the fact that its role is largely unneeded. High-tier farms are usually not needed on late-game runs due to the fact that money rarely runs out after the initial farming. Furthermore, the Sun Temple and True Sun God provide a lot of money with their support sacrifices already, and already form the main pushing force of late game.

However, Monkeyopolis can be pivotal in Boss Battles. This is because the game mode requires farming to be as quick and optimal as possible, making the Monkeyopolis no longer redundant.

Tips

 * 4-2-0 Banana Research Facility is the best sacrifice for each Banana Farm, as it is the most expensive farm that can be sacrificed to Monkeyopolis.
 * It is usually adequate to have around $50K worth of sacrifices, which would give $5000 per round from 10 $500 crates, but sometimes it is worth spending much more on sacrifices if there is very limited space for Banana Farms, such as on Co-Op Mode.
 * Monkeyopolis is one of the best single-tower income methods in the game. It is especially useful for aiming to earn the Bill Greates achievement on Co-Op Mode, as a Monkeyopolis plus either Banana Central + BRF spam or Monkey Bank spam will ensure maximum income generation such that it would be possible to save up $2,500,000 for donating $500,000 to a single player at once.
 * Despite producing crates in a manner similar to a Banana Research Facility, it is still considered a Monkey Village by the game's code. As such, Monkey City, Overclock, and Ultraboost do not directly increase the income of the Monkeyopolis. However, the extra range from an Overclock and potentially a second Monkey Village can allow more Banana Farms to be integrated into the Monkeyopolis when upgrading to it.
 * Since even Monkeyopolis' with relatively small sacrifices are still extremely efficient, it may be worthwhile to buy a smaller Monkeyopolis in order to set up a larger Monkeyopolis later. This is called a 'Miniopolis.'

Optimal Strategy
Ethan Reid did all the math and experimentation in this video for boss events: https://www.youtube.com/watch?v=bre19DOg7Ck: The MINIOPOLIS Farming In BTD6!

The conclusion reached for optimizing Miniopolis for boss fights is:


 * Never go for the 1x 4-2-0 Banana Farm Monkeyopolis. (1 sacrificed Banana Research Facility with the Valuable Bananas crosspath into a Monkeyopolis)
 * Almost always go for the 2x 4-2-0 Banana Farm Monkeyopolis and keep it up for at least 3 rounds. (2 sacrificed Banana Research Facilities with the Valuable Bananas crosspath into a Monkeyopolis)
 * Go for the 3x 4-2-0 Monkeyopolis and keep it up for at least 4 rounds if the player feels confident that they can get away with it. (3 sacrificed Banana Research Facilities with the Valuable Bananas crosspath into a Monkeyopolis)

Note that this is to setup a much larger Monkeyopolis sooner.

Bugs
None
 * Current


 * Patched
 * [1.0] There was a glitch where the Monkeyopolis upgrade was free when another Monkey City is bought without any Banana Farms near it, as the price is determinant on how many farms are near it and is universally dependent on the Monkey City with the least amount of Farms near it (0 meaning all Monkey City can be upgraded into a Monkeyopolis for free). This has been patched as of July 2018.
 * [1.0] Another bug that was patched in July 2018 caused the village to try sacrificing Farms again if the game is exited and reopened. If there are no Farms in it's radius upon reloading the saved game, the income is set to 0.
 * [???] There was a bug where the Monkeyopolis upgrade displayed "Upgrade Locked" without explanation if there are no Banana Farms present and if Monkeyopolis isn't already bought. This has been fixed as of version 4.0.
 * [???] There were three ways to own a Monkeyopolis that cannot produce crates: the first method is to play on Easy Difficulty by placing the very first 0-0-0 Banana Farm in radius of a Monkey City prior to upgrading if the Banana Subsidy MK active (won't produce crates due to the lowered $945 cost being less than $1000), the second method is to place any Banana Farm Instamonkey nearby a Monkey City prior to upgrading it to Monkeyopolis, and the third method is to place a Monkeyopolis Instamonkey. This was fixed in Version 11.0, Monkeyopolis now always produces at least one crate.
 * [27.0?] The 15% income bonus from a Monkey City will not apply to the Monkeyopolis if it gets buffed by a City after the upgrade. If it was in range of a City at the time of upgrading, the income buff only persists until the providing City is removed or the game is reloaded. It was speculated that Monkeyopolis properly accepting the buff is either intended or not intended, but since being fixed in 29.0 Monkeyopolis now can be buffed by an external Monkey City like most other income generators.

Optimal Spots
Note: Requesting users to upload screenshots of optimal Monkeyopolis spots on all maps.

Trivia

 * Monkeyopolis makes Monkey Village one of four non-Paragon towers to do sacrifices, the others being Super Monkey with its Sun Temple and True Sun God, Adora and the Wizard Monkey with its original Path 3 Tier 5 upgrade, Soulbind (later replaced by Prince of Darkness).
 * Similar to Monkey City, the time shown in the artwork is approximately 1:55 on the clock.
 * This is only upgrade that dynamically changes its price (+5000$ per Banana Farm).
 * This price is never affected by price modifiers by difficulty.
 * But its still affected by Sun Temple/God Support Sacrifice discount buff.
 * In the game files, the upgrade icon for Monkeyopolis is written as "MetropolisUpgradeIcon.png".
 * Monkeyopolis used to be targeted by Alchemist buffs until Version 20.0 (at least that's when it is confirmed it no longer works).
 * Monkeyopolis is a mutation on the word, "Metropolis".
 * According to Ninja Kiwi's 18th February 2022 blog, Banana Farms sacrificed to Monkeyopolis are harvested.