Spy Plane (BTD6)

"Allows Monkey Ace to hit Camo Bloons."

- BTD6 description

Spy Plane is the second upgrade of Path 2 for the Monkey Ace in Bloons TD 6. It allows the Monkey Ace to detect and pop Camo Bloons. Monkey Aces with this upgrade also drop pineapples, as this is the upgrade after Exploding Pineapple.

It costs $295 on Easy, $350 on Medium, $380 on Hard, and $420 on Impoppable.

Description
The Spy Plane retains the general shape and color of all tier-2 monkey aces that imitate the Sopwith Camel design, but with two pairs of concentric blue and yellow circles. The pilot goggles are now worn on the eyes with a blue reflection. The Rapid Fire upgrade adds two red lines across the front of the wings. Lots More Darts turns the fuselage gray. Sharper Shots turns the edges of the wings red. Centered Path turns the entire ace red.

Summary
The Spy Plane upgrade allows the Monkey Ace to detect camo. However, utilizing this crosspath requires forgoing the damage per second boost of the "Rapid Fire" and "Lots More Darts" upgrades in path 1 or pierce boost of "Sharper Darts" in path 3. So, it is generally recommended to provide ace Camo Detection from external sources like Radar Scanner or Etienne. The exception, of course, would be if going for a middle-path bomber ace or if there are camo-detection restrictions, as in the case of Challenges and Two-Tower Chimps runs.

Tips

 * Although the lower-tier Ace is not the most reliable camo-popping source, the Spy Plane upgrade is a useful stepping stone to obtain higher-tier Aces.
 * This upgrade can be used to lock into the Bomber Ace upgrade. Considering that the visual appearance of the lower-tier Spy Planes look almost like Bomber Aces but with a basic aircraft appearance, this can be a cue to upgrade further to Bomber Ace soon.

Trivia

 * Spy Plane is the only returning upgrade in BTD6 where the name has the word "plane" as the second word.
 * 0-2-3 Neva-Miss Targeting wears goggles covering the pilot's eyes, but the pilot in the 3-2-0 Fighter Plane does not.