Engineer Monkey (Bloons Tower Defense 7)

The Monkey Engineer is a returning tower from Bloons Tower Defense 5. The 0/0/0 acts the same way as it did in Bloons TD 5. The tower costs $450.

Upgrades
1/x/x - [Sentry Guns] Automatically creates sentry guns and deploys them on the ground nearby. Sentries shoot sharp steel pins at the bloons but only last a short time. ($500)

2/x/x - [Faster Engineering] Engineer increases its build speed, producing sentry guns more often. ($400)

3/x/x - [Sprockets] Adding sprockets to sentries and the Engineer's nailgun increases their fire rate appreciably. ($550)

4/x/x - [Bloon Trap] Creates a powerful bloon trap that destroys all the bloons caught in it. Once full, trap will destroy itself after a short time. If emptied manually, gives you extra cash. Only one trap can be active at a time. ($3,500)

5/x/x - [Super Traps] Creates three bloon traps that destroy four times as many bloons as the standard trap or two MOABs. Once full, the trap will immediately explode, giving double the cash that popping the bloons would normally give, and damaging bloons that are caught in the explosion by one layer. ($40,000)

x/1/x - [9-Inch Nails] Engineer's nailgun upgrades to shoot massive 9-inch nails that can pop 8 bloons at once. ($400)

x/2/x - [Increased Efficiency] Increases attack speed of the Engineer by 15%. ($650)

x/3/x - [Freelancer] Increases attack speed and pierce of nearby towers by 15% and 2, respectively. ($1,500)

x/4/x - [Overclock] Engineer improves its own attack speed and pierce by 30% and 2, respectively. Ability: Target tower becomes super powered for 60 seconds. ($17,500)

x/5/x - [Best in the Business] Ability can be activated 3 times at once and gives $500 upon each use. Ability's effects are permanently used on the Engineer. ($80,000)

x/x/1 - [Better Service] Increases range and grants the Engineer camo detection. ($650)

x/x/2 - [White-Hot Nails] Gives the Engineer (and sentries, if applicable) the ability to pop frozen and lead bloons. ($750)

x/x/3 - [Cleansing Foam] Engineer uses a special dispenser to spray down the track with a cleansing foam that removes camo and regen properties. Also converts lead bloons to gray bloons. ($800)

x/x/4 - [Foam Rockets] The Engineer fires off missiles full of cleansing foam that neutralize resistances and pop bloons. Cleansing foam now removes resistances from black bloons, white bloons, purple bloons, and zebra bloons. ($7,500)

x/x/5 - [Foam Dispensary] Permanent foam is spread across the entire track. All foam does 2 damage per second and removes resistances from DDTs. ($25,000)

Trivia

 * Notes: Path 2 and path 3 bonuses apply to sentries.
 * This tower would be exceptionally good in the early game, and its supporting second path would help a lot in the late game.