Special Agents are items that are purchased with Monkey Money instead of in-game cash. Most Special Agents are towers, but unlike most other towers, they include non-monkey animals such as turtles and squirrels. They have a wide range of functions, including providing offensive coverage in the early-game and changing the terrain to allow water towers to be placed on land and vice versa. Special Agents can be permanently upgraded into Special Agent Pros by using them a certain number of times.
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Specialty Buildings are a mechanic that provides discounts for a specific tower and its upgrades, at the cost of increasing the cost and upgrade costs of another tower (usually one with a similar theme or function). Every tower except the Banana Farm and Monkey Village has a corresponding Specialty Building, and they can be upgraded to apply additional perks that are unique to each tower, such as the Dart Training Facility, which gives the player free Dart Monkeys every 10 rounds, and the Mage Spire, which gives the Monkey Apprentice an additional attack. Specialty Buildings are purchased and upgraded with Monkey Money, and only one Specialty Building can be enabled at a time.
The mobile version of Bloons TD 5 is a reissue of the Flash original for iOS, iPadOS, Android, and Windows Phone, and later ported to Windows and macOS to replace Deluxe. It is a from-the-ground-up remake in a new engine with completely redone graphics. In addition to introducing several new features, it incorporates some elements from Deluxe, such as the Monkey Engineer and Bloonchipper. Because it runs in a different engine, there are several differences in game mechanics, such as how pierce interacts with exploding projectiles. The mobile version has almost all of the same content as the Flash version, but there are a few tracks exclusive to the Flash version.
Bloons TD 5 (Flash)