2TC

“	Complete a game in CHIMPS Difficulty with only 2 monkey towers	”
	^{~ BTD6}

2TC (short for 2 Tower CHIMPS) is an achievement in BTD6, introduced in Version 12.0. It can be achieved by completing CHIMPS Mode with only two towers. Earning this achievement will reward 2 Monkey Knowledge Points and a 0-4-0 Wizard Monkey. The achievement remains invisible until the achievement is completed, as it is one of many hidden achievements in the game.

Strategy[]

Summary[]

2TC requires precise strategy by selecting two different towers that can beat all stages of the game. The starting tower must be affordable on round 6 with $650, while the second tower must be strong enough so that those 2 towers last until round 100. Usually, surviving late-game will probably be the most difficult part of this challenge. 2TC should be done on a Beginner Map for the best results; it is entirely possible on Intermediate Maps but not recommended if just going for the achievement (which will be assumed going forward).

Early-game: Choose a starting tower (or hero) that survives for $650. Threats after early rounds are mainly Round 24's Camo Green, Round 25's Purples, Round 28's Leads, and Round 40's MOAB.

Mid-game: Keep in mind you will not be able to do maximum damage as you cannot afford Tier 5 upgrades. Round 63, Round 76 and Round 78 can cause the run to fail. If you used a hero, only buy its levels when the other tower is maxed out.

The final three rounds of 98-100 require defence to be well-rounded, as they have dense BFBs and ZOMGs, fortified DDTs and a BAD respectively.

Certain heroes have an advantage in 2TC, such as Sauda and Captain Churchill. As for Tier 5 upgrades, Prince of Darkness, Wizard Lord Phoenix, the 5-2-0 Sky Shredder, the 5-2-0 Apache Prime, and the 5-2-0 Ray of Doom are some of the best towers for this challenge. Prince of Darkness plus any tower with good Blimp damage tend to be the easiest to execute, such as PoD + MAD or PoD + RoD.

Geraldo (added in Version 31.0), is one of the best 2TC towers, as long as the other tower can pop Round 28 leads. Examples are 0-0-0 Bomb Shooter, 0-0-0 Alchemist, 0-0-0 Mortar Monkey etc. As of version 34.0, Geraldo is too expensive for the start of chimps, meaning he needs a Round 6 starting tower.

Further testing has shown that on Scrapyard it is in fact possible to use the map's crusher to pop all of round 28 and 30's Leads, when combined with Geraldo's own Amaz-o-Glue and Creepy Idol.

Tips[]

For the best results, attempt this achievement on the map Logs. The sheer length of the map and the various wide corners make it very handy to catch bloons partway through the entire track. This is especially the case for Rounds 95, 98, and 99. Resort also is a good choice, as this favors towers that appreciate from multiple nearby loops.
The easiest 2TC combos tend to involve two Tier 5 Upgrades, with at least one of them having activated abilities. Some ability timings may be necessary to destroy the later rounds, but other than that, completing 2TC should be easy to do. Hero + Tier 5 Upgrade also works as an easy 2TC combination.
2TC does not necessarily have to use a hero, although the best of the heroes for the sake of the achievement include Sauda. Some of these hero-specific combos are very easy to pull off, with the easiest being Sauda + Apache Prime.
Watch out for difficult rounds when performing a 2TC, particularly: Rounds 6-9 (first rounds), 15 (many Yellows and Pinks), 24 (Camo Green), 28 and 30 (first Leads), 40 (first MOAB), 63 (Ceramic rushes), 76 (Regrow Ceramics), 78 (Camo Ceramic rush), 95 (masses of DDTs), 98 (hyperdense ZOMGs and Fortified BFBs), 99 (Fortified DDTs), 100 (BAD).
Don't worry about losing on the current round, as the Retry Last Round function in CHIMPS allows you to try the same round again as much as you want until you get the timings correctly.
There is a community-made record of 2TC completions can be found here. This website mostly serves as an advanced list of 2TCs that excludes Towers that have successfully soloed CHIMPS mode in the past. As of now, this includes Sauda and Geraldo, both of which can perfectly be used as a 2TC for the purposes of this achievement, and Corvus who is generally much harder to master and therefore is not recommended for the 2TC achievement.

2TC Combo Tips[]

0-5-2 Wizard Lord Phoenix + 5-2-0 Apache Prime: It is one of the easier combos outside of Sauda combos. Apache Prime will shred most of the bloons in the game quite easily, while Wizard Lord Phoenix can deal with any nasty blimp rushes or DDTs easily. The only difficult rounds include the transition from Round 98 to 99; be sure to have the Wizard Lord Phoenix ability recharged before fully completing Round 98.
0-2-5 Prince of Darkness + 5-2-0 Apache Prime Another easy combo after Prince of Darkness was buffed in Update 21.0. The only hard rounds are 98 and 99 but with micromangement they should be pretty easy.
0-2-5 Prince of Darkness + 2-5-0 Carpet of Spikes: is also a relatively easy combo. Start with 0-2-1 Wizard, and go for Spike Factory close to the Wizard. Upgrade towards 2-3-0 MOAB SHREDR and 0-2-4 Necromancer before Round 40. Get 0-2-5 Prince of Darkness and 2-5-0 Carpet of Spikes. Proper timing of the ability should be done with the Carpet of Spikes activated ability, specifically on either heavy rounds or high-HP rounds like Round 94, 96, 97, and 98, while the Prince of Darkness should clean up the rest easily.
0-2-5 Prince of Darkness + 5-0-2 Sky Shredder: This 2TC combo is the easy end of the spectrum as well. The early game is a tad bit difficult but after getting a 0-2-4 Necromancer, followed by 3-0-0 Fighter Plane and 4-0-1 Operation: Dart Storm, finishing with 0-2-5 Prince of Darkness and 5-0-1 or 5-0-2 Sky Shredder. This technique only requires micromanagement in the early game, and only with the Wizard, implying the placements are ideal.
0-2-5 Prince of Darkness + 5-2-0 Ray of Doom: Another easy combo, but for the best results it should be done on Resort and not Logs. Place the Wizard on the top of the small square so that when upgraded to Wall of Fire it will land Walls of Fire on a convenient intersection. 0-1-0 Wizard should be bought first, firstly with 0-0-0. Upgrade to 0-2-0. Save up to Dartling Gunner and place it at the start of the track but as far up as possible. Lock the Dartling at the intersection near the end, but aim it slightly high. This placement utilises the bonus damage of the end point of the 4-0-0 Dartling Gunner. Upgrade 0-0-0 Dartling to 0-2-0 Dartling for the Camos and reliable purple-popping. Then get 0-2-2 Wizard and then 3-2-0 Laser Cannon. Afford 0-2-4 Necromancer and 4-2-0 Plasma Accelerator. Save money until affording Prince of Darkness. Then save up a long way towards Ray of Doom. It seems extremely expensive to go towards, but once Ray of Doom is afforded it is almost a guaranteed win as long as the Ray of Doom is targeted onto the right spot.
5-0-2 Glaive Lord + 2-5-0 M.A.D: This 2TC combo is on the easy side of the 2TC spectrum, as long as you micro the Dartling Gunner during required times. Start of with a 1-0-2 boomerang, and save up for Dartling; Hydra Rocket Pods is required for camo leads. Then try to upgrade to Glaive Lord and then save up for MAD. Glaive Lord will pretty much solo until rounds 82-85, then get MAD and you're pretty much set. Micro a bit during rounds 98-99 and the victory should be there.
0-2-5 Prince of Darkness + 2-5-0 M.A.D Similar to 0-2-5 Prince of Darkness with 5-2-0 Ray of Doom except easier to save up for and only requires some ability use on Round 98 and other heavy rounds in order to wipe out excessive Super Ceramics.

Specific loadouts[]

Most information here is mostly oriented for players wanting to attempt advanced 2TC combos, rather than focusing on earning the achievement.

Near-solo[]

"Near-solo" in this context refers to nearly soloing 2TC when given a tower that can counter obvious weaknesses.

There are a certain number of towers in 2TC combos that can solo all Camo Bloon rounds as long as it is given another tower to handle other bloons:

2-5-0 Carpet of Spikes
2-5-0 MAD (2-5-0 for the focused Rocket Storm)
5-2-0 Sky Shredder

There are a certain number of towers in 2TC combos that can almost fully solo late-game when given a way to counter obvious weaknesses in earlier rounds:

Wizard Lord Phoenix requires Round 25 Purple popping power, enough Camo Purple popping power for Round 45, 48, and 95, and some support Midgame.
Ray of Doom requires Round 28 lead-popping and decent cleanup for beating Round 63.
Captain Churchill requires an early-game tower to solo pretty much the rest of the game.
Sauda is a special case because she can be started off in the early-game and can save up greatly while combined with other towers.
The Anti-Bloon requires a camo-detecting tower that also has a lead-popping option and a decent synergy with Tech Terror in the saveup before the final upgrade.
Geraldo solely requires Round 28 lead-popping; otherwise he is able to complete all 100 rounds essentially on his own.
0-2-5 Flying Fortress can solo CHIMPS, but requires another tower to save up for in a real game.

"Perfect" combos[]

"Perfect" combos are 2TC combos that synergize with each other so well that the combination of the two flawlessly beat all stages of the game.

Sauda + Wizard Lord Phoenix
Sauda + Apache Prime
Prince of Darkness + Ray of Doom (also called POD & ROD).
Prince of Darkness + M.A.D
Spirit of the Forest + M.A.D
Glaive Lord + M.A.D

Bugs[]

It used to be possible to complete the 2TC CHIMPS achievement by completing a Challenge Editor challenge with Round 1 to 1 CHIMPS Mode with only two towers. The same bug also affected other achievements that were released on Version 12.0. This bug was fixed in Version 12.1.
In version 12.1, there's a bug that prevents gaining this achievement by using a Wizard Lord Phoenix (x-5-x Wizard) as one of the 2 towers. This was fixed as of Version 17.0.
- This bug was caused by the game registering the phoenix as a separate tower.

Version History[]

Many nerfs and buffs have affected the ability of certain tower combinations to accomplish 2TC.

21.0

Very positively affected by extensive Prince of Darkness buffs

22.0

Very positively affected by Captain Churchill bugfix

24.0

Very positively affected by the introduction of Sauda

25.0

Very negatively affected by Apache Prime damage type nerfs, making it even weaker against DDTs
Positively affected by the introduction of Resort, a map very well-suited for 2TCs

27.0

Negatively affected by nerfs to Sauda's damage at higher levels without Level 11+ benefits

28.0

Negatively affected by Path 3 Ice Monkey price nerfs
Negatively affected by Blooncineration bug preventing it from decamouflaging DDTs
Positively affected by Spirit of the Forest bugfix
Positively affected by attack speed buff of BADS and Bloon Exclusion Zone

28.3

Positively affected by Blooncineration bug fix

30.0

Negatively affected by Rocket Storm damage, duration, and line-of-sight nerfs
Positively affected by The Biggest One damage buff
Positively affected by Flying Fortress price decrease, allowing for affordance before Round 90 at minimum
Positively affected by Ray of Doom price decrease
Negatively affected by Prince of Darkness rework that mostly nerfed 0-2-5 crosspath

31.0

Very positively affected by the introduction of Geraldo
Negatively affected by Prince of Darkness price nerf

Gallery[]

Trivia[]

This achievement is based on a popular challenge on BTD6 reddit where players would only use two unique towers to beat CHIMPS mode, which is considered to be very hard as some combos need hours to complete which may require precise usage of ability and/or luck for the towers to hit the bloons.
The first recorded completion was 5-0-2 Energizer + 2-5-0 The Anti-Bloon in Version 2.1, when super ceramics gave extra cash. It became impossible due to the bugfix in 4.0, then became possible again in 25.0 and gained a downgrade from Energizer to Bloontonium Reactor at the same time.
- The next recorded completion was in Version 8.0.
As of 13 March 2021, there are 296 2TC combos, ignoring crosspathing.
- Sauda has been used in 112 unique combos, the most of any tower. The second-, third- and fourth-most-used towers are Churchill, with 49, Wizard Lord Phoenix, with 45, and Prince of Darkness, with 26.
In a single day on 16th December 2020, Captain Churchill gained 24 new 2TC consecutive combos with various towers, recorded in the BTD6 Index. One day before then, Captain Churchill had a combo with Monkey Pirates.
As of the Permaspike + Archmage combo (171st combo), which was achieved on 12th February 2021 (Link), all Tier 5 Wizard Monkeys have a 2TC with Apache Prime (9th latest, PoD), Sky Shredder (41st latest, Arch), Carrier Flagship (75th latest, PoD), Captain Churchill (84th latest, PoD), Tsar Bomba (87th latest, PoD, no longer possible), and M.A.D (120th latest, Arch).
With the completion of the Sauda + Plasma Monkey Fan Club combo, every possible maximum upgraded tower, excluding Heroes, the Sun Temple, Super Mines, and Legend of the Night have been used in at least one 2TC.
- Benjamin, Gwendolin, and Striker Jones are the only heroes that don't have a 2TC done with them yet.
- Pat Fusty was done with Wizard Lord Phoenix by using a Version 25.0 glitch related to his Rallying Roar giving normal damage type.
With the completion of the Sauda + Super Brittle combo, every type of tower (excluding Heroes) has been used in at least one 2TC, as Ice Monkey was the only non-hero tower type without a 2TC before that completion.
On 9th July 2021, the first completion of 1TC has been done, using Sauda to solo CHIMPS Mode on Resort. As a result, Sauda's 1TC completion has lead her to receive 33 associate 2TC combos, bringing her new total to 202 2TC combos. The added associated combos are:
- Tier 0-2 Dart Monkey, Spike-O-Pult, Juggernaut, Triple Shot, Crossbow
- Tier 0-2 Boomerang Monkey, Bionic Boomerang
- Tier 0-2 Bomb Shooter, Really Big Bombs
- Tier 0-2 Tack Shooter, Blade Shooter
- Tier 0-2 Ice Monkey, Cryo Cannon
- Tier 0-2 Monkey Ace, Bomber Ace
- Tier 0-2 Wizard Monkey, Shimmer
- Tier 0-2 Ninja Monkey, Double Shot, Bloonjitsu, Shinobi Tactics, Flash Bomb
- Tier 0-2 Druid, Druid of the Jungle, Jungle's Bounty, Druid of Wrath, Poplust
- Tier 0-2 Spike Factory, Long Life Spikes
- Tier 0-2 Engineer Monkey, Cleansing Foam, Double Gun, Bloon Trap.
As of April 15th 2022, within a few days of the release of version 31.0 and thus Geraldo, he has attained, or has legitimate potential to obtain, 222 combos, only missing base tower completion with Dart Monkey, Tack Shooter, Heli Pilot, Dartling Gunner, Super Monkey, Ninja Monkey, Banana Farm, Monkey Village, and Engineer Monkey.
- Of the above missing base towers, Super Monkey is too expensive, even if using the caveat of transforming a Dart Monkey with Worn Hero's Cape, as is Dartling Gunner, while both Banana Farm and Monkey Village are also not viable candidates, due to the former being banned on CHIMPS and the latter's Primary Expertise is too expensive.
- Of the rest, with the exception of Dart Monkey, all possess at least one tier 3 upgrade capable of popping Leads, with Dart Monkey having the tier 4, Juggernaut.
- Further testing has revealed that the crusher on Scrapyard is viable for popping the Leads of rounds 28 and 30 if paired with Amaz-o-Glue and Creepy Idol, thus making Geraldo a complete CHIMPS solo. As such, all 2TC combos with all towers, aside from those involving upgrades too expensive to obtain such as Super tier 5s, Paragons and Super Mines are now possible.

2TC

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