Geared

"Community colab update!

Our first ever fan-designed, fan-voted Advanced map: Geared! Beware of moving parts.

Challenge editor update: Restrict Tiers and Paths to make Challenges more fiendish than ever before.

Adora skin: Joan of Arc!

Collection event update: Choose between specific insta-monkey types to fill out your collection faster."

- Version 16.0 description

 is an Advanced Difficulty map in BTD6. It was introduced in Version 16.0. It was the winner of the 50,000 Subscribers Milestone Map Competition on the official BTD6 subreddit.

Overview
All towers can only be placed on the single gigantic gear and the second largest gear in the middle, and both gears turn every round by 45 degrees clockwise. Therefore, it takes 8 rounds for the gear cycle to rotate back to its original state.

Bloons enter from the left end of the path and move towards the right end of the path.

Quotes
"Notes: Bloons travel on the grey path (maybe some sort of raised metal walkway) from left to right. Towers can ONLY be placed on the larger brown cog. After every round, the smaller cog rotates around it's [sic] central white pivot causing the larger cog to rotate anti-clockwise (36 degrees?) around it's [sic] virtual green pivot. One full rotation of the larger cog will be completed every (10 rounds?)"

- Geared original concept description (unmodified)

Sounds
When rotating:
 * [rotating gears]

When rotation stops:
 * [solid stop]

Trivia

 * This is the second time a map has been introduced from a map competition, the first being Skull Peak from BTD5.
 * Although the competition ended during Version 14.0, the map was released two versions later on 16.0.
 * While playing Sandbox Mode on this map, tapping the Play Round button will automatically spin the gear when the round number is not 1, however the animation does not play.
 * The only towers that do not visually show being rotated are Spike Factories, Banana Farms, Monkey Villages, Sun Temple bases, Benjamin (starting from Version 16.1), Prince of Darkness (starting from Version 17.0), True Sun God bases, and Vengeful True Sun God bases. Their positions will still change with the gear, however.
 * The first documented completion of Geared CHIMPS was announced on Reddit on this link. The strategy involved a combination of The Biggest One, Perma-Spike, and Support Chinook.
 * It is often considered to be the hardest Advanced Map in BTD6 (sometimes also considered a "True Expert" along with #Ouch, Muddy Puddles, Quad, and Bloody Puddles), due to how many adjustments are required to adapt to the changes in placement of each of the towers per round. Other candidates include Pat's Pond, Peninsula, High Finance, and Cargo.
 * On the concept description, the central gear was planned to rotate 36 degrees per round, which meant that it would complete a full rotation every 10 rounds. However, this was scrapped in favor of 45 degrees per round (and thus a full rotation every 8 rounds) in the official release of this map.
 * The letters on each tooth of the large gear spell out "Eenie meenie miney moe" in a mysterious language.