Update history:Engineer Monkey (BTD6)

This is a list of changes to the Engineer Monkey in Bloons TD 6 post-release.

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Version 13.0

Tiers	Changes
X-X-4 Bloon Trap X-X-5 XXXL Trap	Traps no longer collect for reduced cash when under a Monkey Town (bug fix)  Traps should collect for the correct amounts after resuming save (bug fix)  Traps will no longer allow bonus traps to be placed when reloading save (bug fix)

Version 14.0

Tiers	Changes
4-X-X Sentry Expert	Crushing Sentry: attack cooldown reduced ― 1.25s → 1s  Boom Sentry: attack cooldown reduced ― 1.5s → 1.4s  Boom Sentry: explosion damage increased ― 1 → 2  Energy Sentry: damage increased ― 1 → 2
5-X-X Sentry Paragon	Champion Sentry self-destruct: damage increased ― 70 → 85  Champion Sentries now self-destruct instantly if sold, skipping the shaking animation
X-4-X Overclock X-5-X Ultraboost	Ability: attack speed buff reduced ― +100% → +66.7% (does not affect Farms or Village range)  Ability: now affects submerged Monkey Subs  Ability: can no longer target Phoenixes (which does nothing)
X-5-X Ultraboost	Ability: permanent attack speed buff reduced ― +10% → +6.67% (max +80%)

Version 15.0

Tiers	Changes
1-X-X Sentry Gun 2-X-X Faster Engineering 3-X-X Sprockets	Sentry: pierce increased ― 1 → 2
4-X-X Sentry Expert	Upgrade cost reduced ― $2,800 → $2,500
5-X-X Sentry Paragon	Paragon Sentry: pierce increased ― 3 → 5

Version 16.0

Tiers	Changes
X-4-X Overclock	Overclock: can now be targeted by Techbot
X-5-X Ultraboost	Ultraboost: will no longer trigger while techbotted if no target was previously set

Version 17.0

Tiers	Changes
1-X-X Sentry Gun and further upgrades	Sentry: No longer gains Camo detection after loading a save (bug fix)  Sentry spawner: No longer ignores smart placement if the Engineer Monkey cannot reach the track (bug fix)
X-4-X Overclock X-5-X Ultraboost	Ability: No longer causes Pat Fusty's Big Squeeze to activate more than once (bug fix)

Version 18.0

Tiers	Changes
4-X-X Sentry Expert	Boom Sentry: Blast radius increased ― 12 → 18  Boom Sentry: Attack cooldown reduced ― 1.4s → 1.3s (attack speed increased by 7.69%)

Version 20.0

“

Continuing our efforts to make crosspaths meaningful and fit the style of each path more solidly, a number of crosspath and base level balance shifts were made.
— Update notes

”

Tiers	Changes
1-1-0 Sentry Gun + Larger Service Area (and further upgrades)	Larger Service Area now grants +4 range to Sentries
1-0-1 Sentry Gun + Oversize Nails (and further upgrades)	Oversize Nails now allows Sentries to pop frozen Bloons  Oversize Nails now increases Sentry pierce by 1
2-X-X Faster Engineering (and further upgrades)	Sentry: Spawn rate increased ― 7s → 6s
4-X-X Sentry Expert	Range of all Sentry types increased ― 45 → 50
5-X-X Sentry Paragon	Paragon Sentry: Explosion radius now scales with range modifiers
X-4-X Overclock	Ability: Active buffs no longer disappear after loading a save
X-5-X Ultraboost	Ability: Now applies the permanent buff immediately upon use, instead of when the temporary buff expires

Version 21.0

“

Engineer is quite poor in terms of crosspathing, so we’ve added crosspath benefits to Cleansing Foam as well as an overall price buff to the middle crosspathing upgrades. We’ve been somewhat unhappy with how Overclock sits in the game for a while and especially how the interaction with tower cost causes levelling heroes naturally to be far advantageous over purchasing upgrades when this is already underused. We have made an attempt to rework these issues by moving it to a tier-based system rather than price.
— Update notes

”

Tiers	Changes
5-X-X Sentry Paragon	Sentry explosion: Damage increased ― 85 → 100
X-1-X Larger Service Area	Upgrade cost reduced ― $550 → $250
X-2-X Deconstruction	Upgrade cost increased ― $200 → $350  Overall cost reduced by $150 (due to cost changes for previous tiers)
0-3-1 Cleansing Foam + Oversize Nails (and further upgrades)	Foam attack: Pierce with Oversized Nails increased ― 10 → 15
X-4-X Overclock	Ability: Duration now depends on the target's highest upgrade tier instead of total cost 105s for tier 0 (new) 90s for tier 1 (new) 75s for tier 2 (new) 60s for tier 3 (instead of $0–$15,000 cost) 45s for tier 4 (instead of $15,001–$40,000 cost) 30s for tier 5 (instead of $40,001+ cost) Hero tiers count as their current level divided by 4, rounded down

Version 22.0

“

Some big buffs to Bloon Trap so it can now be used more effectively
— Update notes

”

Tiers	Changes
X-X-4 Bloon Trap X-X-5 XXXL Trap	Can now spawn multiple traps per round, at a cooldown of 20 seconds for a new trap

Version 23.0

“

Sentry Expert has underperformed for a while, so we’re adding solid crosspathing buffs to all Sentries. We’ve added a pierce & speed boost to Overclock’s base upgrade and lowered the cooldown on Ultraboost to allow the possibility for it to achieve full uptime as a freeplay tower and get its stacks up faster. Finally last update we allowed Bloontrap to be set multiple times per round, and we wanted to stay on the side of caution with a long cooldown, but after seeing it in the wild we are happy to make this cooldown faster.
— Update notes

”

Tiers	Changes
4-0-1 Sentry Expert + Oversize Nails 4-0-2 Sentry Expert + Pin	Oversize Nails increases Sentry pierce by roughly 25% instead of +1 Crushing Sentry: 22 → 28 Boom Sentry: 30 → 38 Cold Sentry: 15 → 19 Energy Sentry remains 5
1-2-0 Deconstruction + Sentry Gun (and further upgrades)	Deconstruction now grants all Sentries +1 damage to Fortified or MOAB Note: Does not apply +2 damage to Fortified MOABs
X-4-X Overclock	Main attack: Pierce increased ― 3 → 15
X-4-X Overclock X-5-X Ultraboost	Main attack: Projectile speed increased ― 375 → 750
X-5-X Ultraboost	Main attack: Pierce increased ― 3 → 30  Ability: Ability cooldown reduced ― 45s → 35s  Also reduces initial cooldown ― 15s → 5s
X-X-4 Bloon Trap	Trap attack: Maximum delay reduced ― 20s → 15s
2-0-4 Bloon Trap + Faster Engineering 2-0-5 XXXL Trap + Faster Engineering	Faster Engineering reduces the delay of the trap attack more ― -20% → -40%

Version 25.0

“

Engineer XXL trap is extremely powerful but too expensive for backline dps and we’d like to see it more viable for frontline engineer builds
— Update notes

”

Tiers	Changes
X-X-5 XXXL Trap	Upgrade cost reduced ― $60,000 → $54,000

Version 26.0

“

It has been clear that Sentry Expert needs changes, with Cryo sentries the only ones that really seemed valuable and purposeful, so all of the others have been improved to fit their role. Additionally higher tier sentries will now be able to benefit from the xx2 Pin crosspath, so enjoy some laser pins. Bloon Trap redeployment rate has also been buffed a fair amount.
— Update notes

”

Tiers	Changes
3-0-2 Sprockets + Pin (and further upgrades)	Pin now allows Sentries from Sprockets and above to pin Bloons
4-X-X Sentry Expert	Crushing Sentry: Damage increased ― 1 → 2  Crushing Sentry: Attack cooldown increased ― 1s → 1.1s (attack speed reduced by 9.09%)  Boom Sentry: Attack cooldown reduced ― 1.3s → 0.9s (attack speed increased by 44.44%)  Energy Sentry: Pierce increased ― 4 → 8
4-0-1 Sentry Expert + Oversize Nails 4-0-2 Sentry Expert + Pin	Oversize Nails grants more pierce to Energy Sentries ― +1 → +2  Stacks with a buff to its non-crosspathed pierce; overall pierce increased ― 5 → 10
X-X-4 Bloon Trap	Trap attack: Base cooldown reduced ― 15s → 12s With 2-X-X Faster Engineering crosspath ― 9s → 7.2s

Version 27.0

Tiers	Changes
X-4-X Overclock	Ability: No longer causes framerate issues if linked to a Tech Bot without a target assigned (bug fix)

Version 28.0

“

Alright, Sentry Paragon is now a Champion
— Update notes

”

Tiers	Changes
5-X-X Sentry Champion	Name changed Before Sentry Paragon After Sentry Champion

Version 29.0

“

Engineer’s bottom 2 paths have a heavier support focus, so to start them off a bit easier we have shifted some starting cost out and into the non-supportive path. For the sake of further improved crosspath potential, we have also re-envisioned the ‘Larger Service’ crosspath as giving smarter service as well in the form for targeting for Bloontrap & Cleansing Foam
— Update notes

”

Tiers	Changes
0-0-0 base tower	Cost reduced ― $450 → $400
3-X-X Sprockets	Upgrade cost increased ― $525 → $575
X-3-X Cleansing Foam and further upgrades	Foam attack: Manual targeting option added
0-1-4 Bloon Trap + Larger Service Area and further upgrades	Trap attack: Manual targeting option added

Version 30.0

“

To add a bit of quality of life solving problems with trap needing to fill once before moving to target location, Bloontraps placed off-track never being able to fill, and maybe even to just add some interesting micro, any Bloontraps will now become expired after a short delay when their Engineer has a new target set.
— Update notes

”

Tiers	Changes
X-3-X Cleansing Foam and further upgrades	Foam attack: Now counts damage when popping Lead Bloons (bug fix)
0-1-4 Bloon Trap + Larger Service Area and further upgrades	Trap attack: Picking new target now destroys the current trap and places a new one

Version 31.0

“

Sentry Expert really needed some logic fixes to get more of the actual correct sentries placed at the right times, it has also received a number of power buffs across the board to the special sentries at T4 complimenting the new logic reworking. Cleansing Foam has had some extra crosspath utility added at the cost of a small price increase and a large decrease to Ultraboost price.
— Update notes

”

Tiers	Changes
4-X-X Sentry Expert	Sentry Expert logic has been reworked to evaluate threat levels based on Bloon types that it can counter, Bloon types that counter the sentries that it wants to spawn, and which of the current threats on screen is the greatest. Distribution of sentry types should scale based on how much one Bloon threat is more of a threat than another.  Crush Sentry: Ceramic damage bonus increased ― +1 → +4  Crush Sentry:Damage type changed ― Sharp → Shatter  Bomb Sentry: Damage increased ― 2 → 4  Cold Sentry: Pierce increased ― 15 → 25  Cold Sentry: Explosion radius increased ― 12 → 18  Energy Sentry: Gains increased MOAB-class damage ― +0 → +2
X-3-X Cleansing Foam	Upgrade cost increased ― $800 → $850
1-3-0 Cleansing Foam + Sentry Gun (and further upgrades)	Foam makes Sentries shoot Foamy nails that strip properties
0-3-2 Cleansing Foam + Pin (and further upgrades)	Pin crosspath allows Cleansing Foam to slow Bloons by 50% for 2 seconds  Pin crosspath allows Cleansing Foam to slow all MOAB-class (including BADs) by 50% for 2 seconds (bug)
X-5-X Ultraboost	Upgrade cost reduced ― $120,000 → $105,000  Overall cost reduced by $14,950 (due to cost changes for previous tiers)
X-X-4 Bloon Trap	Bloon Trap issue resolved on Sunken Columns with Bloontraps falling under the map in certain location (bug fix)
0-1-4 Bloon Trap + Larger Service Area	Bloon Trap issue resolved with certain conditions causing Bloontraps to repeatedly auto-collect even while empty (bug fix)

Version 31.1

“

032 Engineer Cleansing Foam now works correctly on all MOAB Class targets - hope you enjoyed that temporary treat
— Update notes

”

Tiers	Changes
0-3-2 Cleansing Foam + Pin (and further upgrades)	Pin no longer allows foam to slow MOAB-Class Bloons (including BADs and Boss Bloons) (bug fix)

Version 32.0

Tiers	Changes
0-3-2 Cleansing Foam + Pin and further upgrades	Cleansing Foam slow stacks on a single target (bug)

Version 32.1

Tiers	Changes
0-3-2 Cleansing Foam + Pin 0-4-2 Overclock + Pin 0-5-2 Ultraboost + Pin	Foam slow effect no longer stacks on a single target (bug fix)
X-5-X Ultraboost	Ability: now limited to 3 uses per round
Paragon Master Builder	Resolved an issue where the Master Builder’s Sentry ability would not snap placement to your next tap on mobile (bug fix)

Version 33.0

“

The MOAB offense of top path lacks for a mainly dps tower that is quite complex to use, T3 Sprockets already feels underwhelming so is seeing a buff here carrying up to T4, and the 320 crosspath will now be able to double dip on the Fortified & MOAB damage bonuses that it gains. Cleansing Foam is only seeing a slight tweak to help it be more viable if you want to attempt it as 'main camo detection’, and this mainly fixes some issues in ABR games allowing it to catch quick initial camo spawns.
— Update notes

”

Tiers	Changes
3-X-X Sprockets	Sprockets buff amount to sentry rate increased ― 60%s → 50%s Note: Attack cooldown of sentry decreased from 0.57s to 0.475s
3-X-X Sprockets 4-X-X Sentry Expert	Nailgun: Attack cooldown reduced ― 0.42s → 0.35s (attack speed increased by 20%)
5-X-X Sentry Champion	Nailgun: Attack cooldown reduced ― 0.42s → 0.3s (attack speed increased by 40%)
1-2-0 Deconstruction + Sentry Gun (and further upgrades)	Sentry: Deconstruction's bonus damage to MOAB-Class Bloons and Fortified Bloons are no longer mutually exclusive
X-3-X Cleansing Foam (and further upgrades)	All attacks: Now gains 1s of 4x rate on round start

Version 34.0

“

Overclock's considerable longer duration benefit on lower tiers currently serves little purpose and only leads to weirdness in upgrading boosted towers, so for now we’d rather minimize this on the early cases that don’t serve much purpose .
— Update notes

”

Tiers	Changes
X-4-X Overclock X-5-X Ultraboost	Ability: no longer has a 1.75× duration bonus for tier 0 towers  Ability: no longer has a 1.5× duration bonus for tier 1 towers  Ability: no longer has a 1.25× duration bonus for tier 2 towers  Ability: Lasts 60s on heroes regardless of level (undocumented)

Version 35.0

“

Sentry Champion’s pierce crosspath does not feel like it has enough of an edge to compete with the deconstruction crosspath.
— Update notes

”

Tiers	Changes
5-0-1 Sentry Champion + Oversize Nails 5-0-2 Sentry Champion + Pin	Plasma: Pierce increased ― 6 → 7
X-5-X Ultraboost	Upgrade cost reduced ― $105,000 → $72,000

Version 36.0

“

XXXL Trap 205 crosspath hasn’t actually ‘been working’ due to the base attack rate being faster than minimum deployment delay so we have slowed the base rate to make 205 crosspath actually matter. Along with this, since the fortification bonus aspect of x2x hasn’t ever done anything for Bloontraps, 024 will now ignore the fortification of Bloons that it eats
— Update notes

”

Tiers	Changes
0-2-4 Bloon Trap + Deconstruction 0-2-5 XXXL Trap + Deconstruction	Deconstruction now allows traps to defortify anything it consumes prior to capturing
X-X-5 XXXL Trap	Trap attack: Deploy rate reduced ― 2.8s → 5.8s Note: 2.8s min cooldown is unchanged
2-0-5 XXXL Trap + Faster Engineering	Trap attack: Deploy rate reduced ― 2.8s → 3.48s Note: 2.8s min cooldown is unchanged

Version 37.0

“

The 005 crosspath fix in the last update left XXXL Trap slower than previously even if crosspathed to 205, so we are increasing that base 005 slightly to match up the 205 crosspath again so that it isn’t any slower than before.
— Update notes

”

Tiers	Changes
X-4-X Overclock X-5-X Ultraboost	Ability: Can now target Beast Handlers with path 1 or path 2 upgrades
X-X-5 XXXL Trap	Trap attack: Maximum delay reduced ― 5.8s → 4.6s With 2-X-X Faster Engineering crosspath ― 3.48s → 2.76s (does not bypass the 2.8s minimum delay)
5-5-5 Master Builder	Resolved an issue where the Paragon’s permanent speed boost per round would not load until the end of the first round played after loading a save (bug fix)  Engineer Paragon should no longer throw sentries into the middle of the map due to techbots (bug fix)

Version 38.0

Tiers	Changes
Paragon Master Builder	Engineer Paragon no longer defaults to throwing out a Green Sentry after loading a save (bug fix)  Engineer Paragon sentries are now correctly destroyed if their platform is removed (bug fix)  Engineer Paragon sentries no longer position incorrectly when placed as the round ends (bug fix)

Version 39.0

“

Applying pierce crosspathing to Sentry Champion only granting an abysmal +1 pierce to the explosion while an intended joke at the time still feels a little silly, we’re separating that up to get its own larger increase now. Some extra of a makeup buff for XXXL, while the crosspathing rework itself feels nice it ended up nerfing the high-level micro play of this upgrade far more than intended.
— Update notes

”

Tiers	Changes
5-0-1 Sentry Champion + Oversize Nails 5-0-2 Sentry Champion + Pin	Sentry Explosion: Crosspath benefit to pierce bonus increased ― +1 → +21 Note: Pierce increased from 51 to 70
X-X-5 XXXL Trap	Upgrade cost reduced ― $54,000 → $48,000

“

No changes here as well, we know some people are still hoping for a redesign in general, but with everything else about paragons uncertain this was not a good time for that. We also want to have another Paragon in the support category dealing a DPS role before we seriously consider taking away the current only dps in that category which is already well balanced with strong competitive use.
— Update notes

”

Tiers	Changes
5-5-5 Master Builder	Has less Boss damage, especially on Elite and at higher Degrees  Cost per power increased ― $25 → $27.625/$32.5/$35.1/$39

Version 40.0

Tiers	Changes
4-1-0 Sentry Expert + Larger Service Area	Engineer 410 should no longer 'Pin' Bloons after loading a save (bug fix)

Version 41.0

“

Improvements for Sentry Expert AI based on your feedback. Some minor QoL buffs for Ultraboost as it’s very expensive over multiple T4s. Lastly Bloontrap^[sic] was rather unfairly able to steal all cash in Co-op games; we want to avoid dividing one player's farm earnings between the group entirely, but decided on a compromise here to prevent it from stealing that base amount.
— Update notes

”

Tiers	Changes
4-X-X Sentry Expert	Sentry spawner: Priority given to Cold Sentries based on the number of Pinks now caps at 20 Pinks; reaching this threshold gives more priority to balancing the number of Cold Sentries and Boom Sentries  Sentry spawner: Priority given to Energy Sentries based on the number of blue MOABs now caps at 10 blue MOABs; reaching this threshold gives more priority to balancing the number of Crushing Sentries and Cold Sentries
X-5-X Ultraboost	Foam attack: Pierce increased ― 10 → 30  Ability: Duration for tier 4 towers increased ― 45s → 60s  Ability: Duration for tier 5 towers increased ― 30s → 60s
X-X-4 Bloon Trap X-X-5 XXXL Trap	Trap attack: Collecting traps now distributes some of their cash among all players in Co-op, equal to the cash that the captured Bloons would have distributed among all players if popped outside of a trap, while still giving the owner all of the extra cash generated

Version 43.0

“

While better than many options, base Engineer still takes a lot of available starting cash so the cost is reduced slightly and being moved back up into Cleansing Foam & Bloontrap; also with a reduction to Double Gun’s price to reflect the lower value of the base tower. Sentry placements are slightly changing to improve their reliability, and will now spawn closer to the track depending on how much range the sentry has. Sentry Champion, while strong with them, is lacking without high buff support so we’re trying out an increase to the sentry damage on it.
— Update notes

”

Tiers	Changes
0-0-0 base tower	Cost reduced ― $400 → $350
1-X-X Sentry Gun and further upgrades	Sentry deployment: Sentries now spawn within 20% of their range to the track
5-X-X Sentry Champion	Champion Sentry: Damage increased ― 2 → 3
X-3-X Cleansing Foam	Upgrade cost increased ― $850 → $900
X-4-X Overclock	Foam: Pierce increased ― 10 → 15 Note: Ultraboost foam pierce unchanged (30)
X-X-3 Double Gun	Upgrade cost reduced ― $500 → $450
X-X-4 Bloon Trap	Upgrade cost increased ― $3,500 → $3,600

Version 44.0

• "Placing a Master Builder turret at the very bottom of the screen should no longer crash"

Version 45.0

“

The Ultraboost ability is now starting on cooldown to put a limit on buy’n’resell issues, but this is to ease up on the use per round limit which was causing frustration. We felt the Master Builder's perma-buff-per-round wasn’t valuable enough to make use of building in advance, so we are reducing the base attack speed with increased power in return to more heavily improve the maximum scaled power from this.
— Update notes

”

Tiers	Changes
X-5-X Ultraboost	Ability: now starts with its full cooldown instead of carrying over Overclock's cooldown  Ability: max uses per round increased ― 3 → 10
5-5-5 Master Builder	Attack speed bonus per round increased ― 10% → 30%  Minimum attack cooldown increased ― 0.05s → 0.15s  Nail gun: cooldown increased ― 0.3s → 1s  Nail gun: damage increased ― 100 → 300  Nail gun: bonus damage to bosses increased ― +100 → +500  Nail gun: stun duration increased ― 1s → 5s  Green Sentry Paragon: targeting can now be changed to Locked

Version 46.0

“

Now that Ultraboost has an initial cooldown we are again allowing it to be used between rounds. Middle crosspath feels too good for Bloontraps because of the massive quality of life it brings, so we’re pushing the DPS more for top crosspath by allowing Double Gun to also double the projectiles of Sentries. The expensive XXL Trap's cash generation comes in too late given Bloontraps fall off as an income generator in the late game, so we’re reducing the upgrade cost and increasing the cash generation that it brings.
— Update notes

”

Tiers	Changes
X-5-X Ultraboost	Ultraboost ability: can now be activated during the break between rounds
1-0-3 Double Gun + Sentry Gun (and further upgrades)	Double Gun Sentries now shoot two projectiles at once
X-X-4 Bloon Trap X-X-5 XXXL Trap	Trap: Disappears when the Engineer is sold or sacrificed. No cash will be collected from the trap. (bug) Note: This behavior is intended for Tier 5 but not for Tier 4
X-X-5 XXXL Trap	Upgrade cost reduced ― $48,000 → $45,000  Trap: cash per Bloon captured increased ― ×2 → ×3

Version 46.2

Tiers	Changes
1-0-3 Double Gun + Sentry Gun (and further upgrades)	Double Guns no longer reduces Sentry pierce by 1 (bug fix)

Version 47.0

“

This was becoming annoying screen clutter with large numbers of sentries, and feels unnecessary when you can overclock the engineer itself to create more sentries instead.
— Update notes

”

Tiers	Changes
1-X-X Sentry Gun and further upgrades X-4-X Overclock X-5-X Ultraboost	Overclock and Ultraboost abilities no longer target Engineer sentries
2-0-0 Faster Engineering	Nail: No longer has +1 bonus MOAB damage (bug fix)
0-1-4 Bloon Trap + Larger Service Area and further upgrades	Bloontrap cooldown should no longer break depending on upgrade order (bug fix) Note: Larger Service Area no longer bypasses minimum trap delay (2.8s)

Version 48.0

“

Really only one major change here; a rebalancing to how the 2xx Crosspath applies across various engineer upgrades, and some base stats being changed to accommodate fitting this.
— Update notes

”

Tiers	Changes
2-X-X Faster Engineering (and further upgrades)	Sentry spawner: Attack cooldown reduced ― 6s → 5s (attack speed increased by 20%) Note: Effectively allows one more Sentry at a time without any attack speed buffs
4-X-X Sentry Expert	Crushing Sentry: Attack cooldown increased ― 1.1s → 1.2s (attack speed reduced by 8.33%)  Boom Sentry: Attack cooldown increased ― 0.9s → 1s (attack speed reduced by 10%)  Cold Sentry: Pierce decreased ― 25 → 24
X-4-X Overclock	Foam attack: Pierce decreased ― 15 → 14
X-5-X Ultraboost	Foam attack: Pierce decreased ― 30 → 24
X-X-5 XXXL Trap	Trap attack: Minimum replacement time reduced ― 2.8s → 2.1s
5-5-5 Master Builder	Resolved an issue where Sentry Paragon explosions would forget their Support categorization after loading a save (bug fix)

Crosspath changes

Tiers	Changes
4-0-1 Sentry Expert + Oversize Nails 4-0-2 Sentry Expert + Pin	Oversize Nails grants more pierce to Crushing, Boom, and Energy Sentries ― +25% → +50% Crushing Sentry: +6 → +11 Boom Sentry: +8 → +15 Energy Sentry: +2 → +4  Oversize Nails now grants +50% pierce to Cold Sentries (previously had no effect)  Stacks with a nerf to the non-crosspathed pierce; overall pierce with this crosspath increased ― 25 → 36
5-0-1 Sentry Champion + Oversize Nails 5-0-2 Sentry Champion + Pin	Oversize Nails grants more pierce to Champion Sentries Main attack: +2 → +5 Explosion: +20 → +25
2-3-0 Cleansing Foam + Faster Engineering (and further upgrades)	Faster Engineering reduces the foam attack's cooldown more ― -40% → -50%
0-4-1 Overclock + Oversize Nails 0-4-2 Overclock + Pin	Oversize Nails grants more pierce to the foam attack ― +5 → +50%  Stacks with a nerf to the non-crosspathed pierce; overall pierce with this crosspath increased ― 20 → 21
0-5-1 Ultraboost + Oversize Nails 0-5-2 Ultraboost + Pin	Oversize Nails grants more pierce to the foam attack ― +5 → +50%  Stacks with a nerf to the non-crosspathed pierce; overall pierce with this crosspath increased ― 35 → 36
2-0-4 Bloon Trap + Faster Engineering (and further upgrades)	Faster Engineering reduces the trap attack's maximum delay more ― -40% → -50%
2-0-5 XXXL Trap + Faster Engineering	Faster Engineering now reduces the trap attack's minimum delay by 25%  Stacks with changes to the non-crosspathed minimum delay; overall minimum delay with this crosspath reduced ― 2.8s → 1.4s

Version 49.0

“

We may return to this again later, but for now due to the clear desire for more Paragon synergy options the Engineer Paragon is trading in some of its main attack damage in exchange for a new AoE Overclock ability
— Update notes

”

Tiers	Changes
1-X-X Sentry Gun	Description changed ― Creates temporary sentry guns and deploys them nearby. → Creates temporary sentry guns and deploys them close to track anywhere in radius.
5-5-5 Master Builder	Nail gun attack: Bonus damage to Bosses reduced ― +500 → +300  Gains the Power Glove ability that can overclock Paragons and all other towers in a small area Description changed ― Monkey engineering developed to perfection. Creates three Mega Sentries that can build their own sentries. → Monkey engineering developed to perfection. Can Overclock other Paragons, and creates three Mega Sentries that can build their own sentries.

Version 49.2

Tiers	Changes
5-5-5 Master Builder	Power Glove ability: effects now persist between saves  Sub Towers from Paragons should now correctly be stunned when the main tower is

Version 50.0

“

Overclock’s Village range bonus always felt like an odd special case, and now that there is a proper dedicated range bonus ability the combined range this grants for villages ended up being overpowered, after consideration we didn’t want to jump straight to deleting the ultraboost stacking tech here but have lowered the range bonuses from Overclock.
— Update notes

”

Tiers	Changes
4-2-0 Sentry Expert + Deconstruction	Energy Sentry: Bonus damage to MOAB-Class Bloons increased ― +2 → +3 (bug fix)
X-4-X Overclock and further upgrades	Overclock buff: Range bonus on Monkey Villages decreased ― +25% → +10% Note: Also affects the temporary Ultraboost effect. Does not affect Paragon's Power Glove (+25%)
X-5-X Ultraboost	Ultraboost buff: Range bonus on Monkey Villages per stack decreased ― +2.5% → +1.5%
Paragon Master Builder	No longer can be targeted with another Engineer’s Overclock (bug fix)

Version 51.0

“

Engineer Paragon is no longer balanced due to its new ability, so we’re adjusting its base attack rate and range to bring it a little more back in line
— Update notes

”

Tiers	Changes
Paragon Master Builder	Main attack: Attack cooldown increased ― 1s → 1.5s (attack speed reduced by 33.33%)  Range decreased ― 70 → 60 Note: Mega Sentries and Modified Paragon Sentries unchanged (70 and 50)

Version 52.0

“

Engi Paragon is too good across the board since the addition of its Overclock ability, we’re moving the Village Range buff in line with the normal overclock, and nerfing its ability cooldown so that higher degrees are required to keep a high uptime buffing other paragons. Since the AoE overclock is unique to the Engineer Paragon and not aimed at other Paragons that part of the ability is instead being improved on.
— Update notes

”

Tiers	Changes
Paragon Master Builder	Power Glove ability: Bonus range given to Monkey Villages decreased ― +25% → +15%  Power Glove ability: Cooldown increased ― 45s → 90s  Power Glove ability: Overclock area of effect radius increased ― 24 units → 30 units  Power Glove ability: Overclock area of effect duration increased ― 15s → 30s

Version 52.1

“

• Engineer Paragon’s changes has some issues, so clearing this up for now
  • Duration is set to 60s
  • Tiers 1-5 receive a duration multiplier of 1x
  • Paragons receive a duration multiplier of 0.25x
  • The AoE duration will now also last 60s instead of 30s, not intended but we will be leaving this in as is for now
    — Update notes

”

Tiers	Changes
5-5-5 Master Builder	Power Glove: Duration for tier 4 towers increased ― 45s → 60s (duration penalty removed)  Power Glove: Duration for tier 5 towers increased ― 30s → 60s (duration penalty removed)  Power Glove: Duration for Paragons decreased ― 30s → 15s (duration penalty increased from 50% to 75%)  Power Glove: Duration for towers in area of effect increased ― 30s → 60s

Version 53.0

“

Engineer Paragon's power glove pairs up much too well with some paragons compared to others so we’re trying out a shift to lower cooldown but also lower duration to break this up.
— Update notes

”

Tiers	Changes
5-5-5 Master Builder	Power Glove: Cooldown decreased ― 90s → 60s  Power Glove: Duration for Towers in zone reduced ― 60s → 30s  Power Glove: Duration on Paragons reduced ― 25% → 15% Note: Duration decreased from 15s to 9s

Version 54.0

“

[While talking about Wizard Paragon changes] Since its addition this synergy has been a problem for Paragon balance, so we’re implementing a special-case to make Overclock less effective on the Wizard Paragon; this allows us to buff that lost power back into the Powerglove Overclock. Since these changes are "magically" linked, we’re mentioning the Engineer buff here too—also to cast Confusion on anyone who skips this section and only reads the Engineer notes!

[...]

Overclock’s duration on level 20 heroes has been excessive; we’re cutting the jank and standardizing to a consistent 30s duration for heroes, with Ultraboost still providing the full 60s.
— Update notes

”

Tiers	Changes
X-4-X Overclock	Overclock: Buff duration on Heroes decreased at all levels ― 60s → 30s Note: Ultraboost temporary buff unaffected (60s)
X-1-4 Bloon Trap + Larger Service Area and further upgrades	Bloon Trap now correctly moves on target point set after loading a save (bug fix)
X-X-5 XXXL Trap	XXXL Trap should now count cash generated correctly (bug fix)
5-5-5 Master Builder	Power Glove: Buff duration on Paragons increased ― 9s → 15s Note: Duration percentage increased from 15% to 25%

Version 55.0

“

Oh yea we have one more tower balance change. As the Engineer paragon moves to a more supportive role, we are toning down the direct boss damage and attack speed but also lowering the upgrade cost.
— Update notes

”

Tiers	Changes
5-5-5 Master Builder	Paragon cost reduced ― $650,000 → $600,000  Main attack: Bonus damage to Bosses reduced ― +300 → +100  Main attack: Attack cooldown increased ― 1.5s → 2.0s (attack speed reduced by 25%) Note: Minimum attack cooldown after self-ultraboost unchanged (0.15s)