Bloons TD 2 Advanced Strategy Guide
Complete advanced strategy guide for BTD2 with expert tower combinations, bloon counters, placement tactics, and money management tips to master all difficulty modes.
Introduction -- What's New in BTD2
Bloons Tower Defense 2 (BTD2) builds on the original BTD1 with several fresh features and challenges. New content includes: three distinct maps (difficulty levels: Easy, Medium, Hard), an additional monkey tower type (the Boomerang Monkey), and on-track placeable items (Road Spikes and Monkey Glue). BTD2 also introduces two new bloon enemy types -- Lead Bloons and Rainbow Bloons -- which require new tactics to defeat. Existing towers receive extra upgrades too (notably the Super Monkey's Laser Vision upgrade), increasing strategic depth. All 50 rounds must still be beaten to win, but the added tower options, new bloon immunities, and multiple tracks make BTD2 a tougher and more engaging challenge than its predecessor. In short, expect more variety in maps and enemies -- you'll need to diversify your defense beyond the basic tactics that worked in BTD1.
Tower Usage and Upgrade Priorities
Choosing the right towers and upgrades is crucial for high-round success. BTD2 offers six primary towers (plus two road items), each with unique strengths. Below we break down effective usage and upgrade priorities for each tower:
Dart Monkey
Your cheapest tower and early-game staple
Your cheapest tower (cost $250 on Easy) and a staple for early rounds. Upgrade Priority: Get Piercing Darts first to hit 2 bloons per shot -- this dramatically increases popping power for a low cost. Long Range Darts can be added later for coverage. In early waves, a few Dart Monkeys with piercing upgrade can handle slow Red, Blue, and Green bloons efficiently. However, Dart Monkeys alone cannot pop Lead Bloons, so transition to other towers by mid-game.
When to use:
Tack Shooter
Area denial specialist for corners and loops
Excellent area denial when placed at corners or loop intersections (it shoots 8 tacks in all directions). Upgrade Priority: Faster Shooting is key -- doubling its attack speed significantly boosts DPS against clustered bloons. Extra Range helps cover more track if placed slightly away from the road. A well-placed Tack Shooter (with faster shooting) can shred groups of weak bloons and is very cost-effective for crowd control. It also pops Black Bloons (which are immune to explosions) since tacks are "sharp" projectiles. Many pro strategies lean on a combination of Tack Shooters and Bomb Cannons for their synergy.
When to use:
Ice Tower (Ice Ball)
Freezing support - stalls bloons for your damage dealers
A support tower that freezes bloons in place, buying time for other towers to attack. Frozen bloons can't be popped by sharp projectiles (darts, tacks, etc.), so plan to have a Bomb or a Boomerang (with Sonic Boom upgrade) to finish them off. Upgrade Priority: Long Freeze Time to extend how long bloons stay frozen, and Wide Freeze Radius to freeze larger groups. The Ice Tower itself doesn't deal damage, but it combos well with Bomb Towers (frozen bloons can still be blown up) and with the Boomerang Monkey's Sonic Boom (allowing boomerangs to pop frozen bloons) for a powerful slow-and-shatter combo. Use Ice strategically on dense waves to stall bloons, but be cautious when White Bloons appear -- they are immune to freezing entirely.
When to use:
Bomb Tower (Cannon)
Explosive splash damage - the only answer to Lead Bloons
The Bomb Tower throws explosive bombs with area-of-effect damage -- indispensable for dealing with certain bloons. Upgrade Priority: Bigger Bombs first to increase blast radius (hitting more bloons per shot), followed by Extra Range Bombs if needed to cover key chokepoints. The Bomb Tower is the only tower in BTD2 that can pop Lead Bloons, because leads are immune to sharp darts/tacks. By round 20 (when the first Lead appears), ensure you have at least one Bomb Tower on the field. Bombs will also make quick work of clustered bloons and can smash down tough Rainbows to expose the bloons inside. Important: Bombs cannot pop Black Bloons (blacks are explosion-immune), so never rely on cannons alone -- always pair them with sharp towers (like darts or tacks) to clean up Black Bloons that bombs leave behind.
When to use:
Super Monkey
Hypersonic late-game powerhouse
The Super Monkey is extremely powerful, firing darts at hypersonic speed, but comes with a hefty price tag (base cost $3,600 on Easy). It's usually a late-game investment once your economy is built. Upgrade Priority: Epic Range is relatively cheap for the huge range increase -- this lets a Super Monkey cover large portions of the track. Laser Vision is the new upgrade in BTD2, giving the Super Monkey laser blasts that pop 2 bloons per shot and can pop frozen bloons. Laser Vision essentially doubles Super Monkey's popping power and negates the Ice Tower's downside, so get it if you're running a Super Monkey + Ice combo. Keep in mind, however, that even Super Monkey lasers cannot pop Lead Bloons (lasers count as sharp in this game), so you will still need Bomb Towers for leads. Because of its cost, use Super Monkey as a late-game luxury to deal with overwhelming bloon rushes (especially useful against fast Yellow or layered Rainbow bloons) -- but only after you've covered essential defenses (like lead-popping and group damage) with cheaper towers.
When to use:
Boomerang Monkey
Brand-new tower with curved multi-target attacks
The only brand-new tower in BTD2. Boomerang Monkeys throw a curved boomerang that can hit bloons twice (going out and returning), popping up to 2 bloons per throw by default. Upgrade Priority: Multi-Target is a must-buy -- it allows each boomerang to pop up to 5 bloons in one throw, dramatically improving its crowd-clearing ability. This makes the Boomerang Monkey fantastic for mid-game when streams of bloons get thicker. Sonic Boom is also important if you are using any Ice Towers -- Sonic Boom lets the boomerang pop frozen bloons (otherwise boomerangs, being sharp, would be useless against frozen targets). A 2/2 upgraded Boomerang (both upgrades purchased) is an excellent mid-game tower for handling clumps of bloons; position it where its curved throw can graze a long stretch of the track. One limitation: like other sharp towers, Boomerangs cannot pop Leads, so don't count on them when Round 20 hits unless you have bomb support.
When to use:
Road Spikes
Single-use safety net for leak prevention
A single-use pile of spikes you can place on the track to pop bloons that pass over them. Each pile pops up to 10 bloons. Road Spikes are inexpensive and very useful as a safety net -- placing a spike pile near the exit can catch leak-through bloons that your towers miss. Important: Road Spikes cannot pop Lead Bloons, so don't rely on them for lead defense. Since they last only until the end of the round, use them sparingly (when a few strays are about to escape your maze). Pro tip: If a surprise rush of fast bloons gets past your main defenses, quickly dropping spikes can save lives and is cheaper than buying a new tower mid-round.
When to use:
Monkey Glue
Single-use slowdown item for dense waves
Another single-use item introduced in BTD2. Monkey Glue creates a sticky patch on the track that slows down about 20 bloons that pass through it. Glue doesn't pop bloons, but the slowdown can be lifesaving when you're overwhelmed. A well-timed glue on a dense wave gives your towers extra seconds to inflict damage. Glue is especially useful on fast bloons like Yellows or on rounds with huge speed increases. Use Monkey Glue on later rounds when bloons start pushing through too quickly for your defenses -- it effectively "lengthens" your maze by keeping bloons in range of your towers longer. Like spikes, glue expires at round's end, so only use it when needed (it costs $35 on Easy).
When to use:
New Bloon Types and How to Counter Them
BTD2 adds two new bloon types that did not exist in BTD1. These bloons have special properties that demand specific counter-tactics:
Lead Bloon
The Lead Bloon is a gray, metal-coated bloon that moves at the speed of a Red (slow) but is immune to all sharp damage (darts, tacks, boomerangs, road spikes -- none of those can pop it). Leads can only be popped by explosive damage (or other non-sharp methods). When popped, a Lead Bloon releases 2 Black Bloons.
How to counter: Bomb Towers are your primary answer to Leads. A single Bomb Tower shot will destroy a Lead, revealing the blacks inside. Because Black Bloons are immune to explosions, you should have other towers (dart/tack/boomerang) positioned to immediately handle the Blacks after the Lead breaks. Do not rely on Road Spikes -- they do nothing to Leads. The first Lead appears on Round 20, so have a Bomb Tower up by then or you will be helpless against it. A common mistake for newcomers is over-relying on Dart Monkeys; this will fail at Round 20 because it is impossible to win BTD2 using only Dart Monkeys and/or road spikes due to Lead Bloons. In summary: get a Cannon early, and consider adding a second Bomb Tower by Round 28-30 when multiple leads and lead-based bloons start coming. After popping leads, be ready to target the Black Bloons that spawn -- a couple of Tack Shooters or a glued track section can help contain the blacks once the lead layer is blown off.
Rainbow Bloon
The Rainbow Bloon is the highest-tier and toughest normal bloon in BTD2. It's brightly colored and slightly faster than White Bloons (though still a bit slower than Yellow Bloons). When popped, a Rainbow releases 2 Black Bloons and 2 White Bloons -- essentially a huge cascade of bloons (each of those blacks/whites will further spawn 2 Yellows upon popping, so one Rainbow equates to a lot of bloons). The Rainbow has an RBE (Red Bloon Equivalent) of 37, the highest of any bloon in this game.
How to counter: Rainbow Bloons require focused firepower to break, and then a plan to manage the flood of offspring. A strong tactic is to use a combination of Bombs and rapid-firing towers. For example, a Bomb Tower hit will greatly damage a Rainbow (or pop it, if enough bomb power is concentrated), then your Dart Monkeys, Boomerangs, or Super Monkeys should immediately clean up the resulting Black and White bloons. Do not rely on a single tower type -- Rainbows test your entire defense. If you have a Super Monkey, its fast attacks help shred Rainbows quickly (especially if upgraded with Laser Vision), but remember to include some Tack Shooters or other sharp towers to handle the Black Bloons that lasers/bombs can't finish. Glue is also effective here: gluing the offspring bloons (the blacks and whites) can slow them down so they don't overwhelm you after the Rainbow pops. By the later rounds (40+), Rainbow Bloons will appear in large groups, so area damage is key -- multiple Bomb Towers with Bigger Bombs, backed by pierce-boosted darts or multi-target boomerangs, work well to contain the rainbow rush.
Powerful Tower Combinations and Placement Strategies
To reach high rounds in BTD2, it's not just about individual towers, but how you combine and position them. Here are some proven tower combinations and placement tips used by advanced players:
Bomb + Tack Shooter Combo (Bombs and Tacks)
This classic combo exploits the synergy between explosives and sharp projectiles. Bomb Towers soften or eliminate thick layers and special bloons (like Leads), while Tack Shooters mop up what bombs cannot kill (e.g. Black Bloons) and handle large swarms efficiently. A strategy employed by experts is to mass Tack Shooters and Cannon towers together. The cannon's splash damage weakens bloons and wipes out the fragile layers, and then tack shooters rapidly fire on the remaining fragments (especially black/yellow bloons that survive the blasts). To use this combo, place a Bomb Tower at a spot where it can hit bloons early (to break leads and rainbows sooner) and put Tack Shooters near corners right after the bomb impact zone -- this way, any black/yellow bloons emerging from a bomb explosion immediately run into a wall of tacks. This pairing can carry you through most of the game: it's cost-effective and covers each other's weaknesses (bombs cover leads, tacks cover blacks). Many advanced guides note that cannon+tack are "sufficient" for beating the game because of this strong synergy -- though you can certainly mix in other towers for support.
Ice + Bomb (Freeze Shatter Combo)
An Ice Tower and Bomb Tower in tandem can control and destroy huge clusters. Place an Ice Tower in a spot that hits bloons when they're bunched up (e.g. just as they exit a fast straightaway into a turn). Freeze them, and then use a Bomb Tower to explode the frozen bloons. In BTD2, frozen bloons are immune to sharp damage, but bomb explosions will pop frozen bloons. With the Long Freeze upgrade, you can lock bloons in place long enough for a bomb or two to drop on them, often eliminating the entire frozen group. Add a Boomerang (Sonic Boom) to this combo to help -- the Sonic Boom boomerang can also pop frozen bloons, so as the Ice Tower refreezes new arrivals, the boomerang and bomb together shatter the old frozen ones. This combo is especially useful on dense waves in later rounds, where slowing the bloons down is half the battle. Just remember white bloons won't freeze at all, so have other towers to deal with any whites in the mix (bombs will still damage whites since their immunity is only to freezing, not explosions).
Glue + Splash Damage
Don't overlook Monkey Glue in tough situations. One powerful approach on intense rounds is to drop glue at the start of the round and let your splash towers (Bombs, or even Tack Shooters which effectively have pseudo-splash in 8 directions) pummel the slowed bloons. By slowing bloons, you maximize the time bombs have to reload and hit again. For example, a Rainbow bloon cluster slowed by glue might take two bomb hits instead of one before exiting the blast radius, ensuring it breaks apart fully under fire. Glue is also great paired with Super Monkey: glue keeps fast bloons in the Super Monkey's range longer, allowing its rapid darts (or lasers) to deal significantly more damage before the bloons get far. Essentially, Glue multiplies your tower DPS by time-stretching the wave -- a vital trick as bloon speeds increase.
Boomerang + Tack (Area Coverage)
If you're struggling with wide rushes of bloons, Boomerangs and Tack Shooters together can blanket the screen with projectiles. Boomerangs with Multi-Target can hit several bloons and have a sweeping arc, while Tack Shooters fill any gaps with their radial shots. A Boomerang placed at a bend can carve through bloons along the curve, and right at that same bend, a Tack Shooter can finish anything that slips by. This combo uses no explosive, so it won't handle leads -- but if you place a bomb nearby for leads, the boomerang+tack duo will obliterate the rest of the swarm. This is a useful combo on earlier rounds or secondary defenses on parts of the track far from your main bomb. It's also a budget combo -- boomerangs and tacks are relatively cheap, letting you cover multiple track sections. Just be mindful to upgrade the boomerang's Sonic Boom if you incorporate any Ice Tower in the mix (so frozen bloons don't jam up your boomerang's effectiveness).
Super Monkey as Cleanup Crew
A strategy for late-game rounds (40-50) is to use a Super Monkey primarily as a cleanup tower behind your main defenses. For example, you might set up Bombs and Tacks in the front half of the track to do the heavy popping, then station a Super Monkey in the back half. By the time bloons reach the Super Monkey, they should be mostly broken down into lower layers -- at which point the Super Monkey's rapid fire can easily finish off remaining bloons. This positioning ensures the Super Monkey always has targets it can actually pop (i.e., no leads because those were broken by bombs already, and fewer thick rainbows because those were exploded earlier). If you give the Super Monkey Epic Range, it might even contribute to the mid-track popping, but its primary job is to catch leaks. This "backline Super" approach is safer than relying on the Super Monkey as a lone frontliner, because if a lead or huge rush comes unexpectedly, the layered defense will still handle it. Plus, you can save money by not upgrading the Super Monkey to lasers immediately -- if its job is cleanup, the base darts (with maybe Epic Range) could suffice until you can afford Laser Vision for added security.
No matter the combo, smart placement is critical:
Bomb Tower Placement
Position Bomb Towers at corners or junctions where bloons bunch up, to maximize splash hits. Also, ensure they are placed such that their range just covers the track -- bombs have slight travel time, and a miss could waste a shot.
Tack Shooter Placement
Place Tack Shooters inside curve bends or at intersections where the track loops around them. This allows more tacks to hit bloons multiple times as they travel along the curve. Remember tacks shoot in 8 directions, so centering a Tack Shooter in a loop can hit bloons on both entering and exiting that loop.
Dart Monkey Placement
Use Dart Monkeys on long straight segments to snipe down rows of bloons (their straight-line shooting is wasted on zig-zag sections, but deadly when bloons line up). If you have multiple dart monkeys, spread them out so they cover different segments rather than all clumping in one spot.
Ice Tower and Glue Placement
Ice Towers and Glue should be placed just before your highest-damage area. For example, put an Ice Tower at the start of a gauntlet of Tack Shooters, so bloons get frozen right as they enter the "kill zone," allowing all tacks to concentrate fire. Similarly, glue near the entrance of a kill zone slows bloons for the towers ahead.
Boomerang Monkey Placement
Boomerang Monkeys benefit from open space around them (so the boomerang can complete its arc). Don't box a Boomerang in a tight corner; instead, place it where its boomerang will curve along the track path (experiment with positions to see the flight path).
Road Spikes at the Exit
Keep a handful of Road Spikes ready at the very end of the path. A common pro move is to always have one stack of spikes on the exit as insurance. It costs a bit of money each round, but if you're aiming for mastery and a flawless victory, this can catch a stray bloon you didn't notice.
Money Management, Wave Pacing, and Difficulty Adaptation
Even with great towers, you need solid economy and pacing to succeed in BTD2's harder modes. Here are some advanced tips on managing money and adjusting as the game grows more difficult:
Early Game Economy
You start BTD2 with limited cash (e.g. $650 on Easy), so spend wisely. Focus on high-value towers/upgrades first -- typically, a couple of Dart Monkeys with Piercing Darts or a Tack Shooter with Faster Shooting give a strong start without breaking the bank. Avoid splurging on a Super Monkey too early; its cost can leave the rest of your defense underdeveloped. Instead, build a cost-efficient foundation: e.g., 2 Dart Monkeys and 1 Tack Shooter can comfortably handle the first 10+ rounds on Easy/Medium. Save money by not overbuilding in easy waves -- if Round 3 only has a few blues, you don't need 5 towers out yet.
Income in BTD2
Unlike later BTD games, BTD2 has no farms or extra income sources -- your money comes solely from popping bloons each round. This means losing lives not only puts you closer to defeat but also means you didn't pop those bloons (so you lost cash income). Thus, leaking bloons has a double penalty. It's often worth spending a little on road spikes to prevent leaks, because keeping full income snowballs your cash for future rounds. A perfect no-leak run maximizes your money.
Upgrade vs. New Tower
A common strategic question is whether to upgrade existing towers or buy new ones. Generally, upgrades that increase popping power (pierce or damage) are very cost-efficient in BTD2. For example, Piercing Darts (cost ~$180) effectively doubles a Dart Monkey's output for less than the price of a new Dart Monkey. Similarly, Bigger Bombs on a cannon covers far more bloons for a few hundred dollars, often better than adding a second cannon with small blasts. However, adding new towers expands coverage. A good rule of thumb: upgrade for power, add new towers for coverage. If bloons are escaping in a section of track with no towers, you likely need a new tower there. If bloons are overwhelming an area where you already have some defense, an upgrade might solve it. Balance is key -- by round ~30 you want a mix of moderately upgraded towers covering all parts of the path.
Adapting to Hard Difficulty
If you're pushing into Hard mode, note that you start with less cash and towers cost more (and you may have fewer lives). This means efficiency is everything. Prioritize the most cost-effective towers/upgrades: Tack Shooters and Bomb Towers remain stars since they give a lot of popping power per dollar. You will likely need to delay purchasing the Super Monkey until even later, and instead lean on mid-tier towers (boomerangs, extra dart monkeys) to cover the gaps. Because cash is tighter, avoid "overkill" -- for example, don't spend money on Long Range Darts if the monkey is already covering the needed area, and don't place a second Ice Tower when one with upgrades will do. Small optimizations like that add up in Hard mode. Also, lives are precious -- on Hard you might only have 20 lives, so a single Rainbow sneaking through can end your run. Thus, playing Hard often involves more layered defense: you create multiple fallback points on the track. Unlike Easy where one choke point defense might handle everything, Hard may require a primary kill zone and a secondary cleanup zone further down the track to catch what leaks through. Plan your tower placements accordingly (e.g., perhaps have a bomb+tack setup at the midway point, then another tack+dart near the exit as a backup).
Continual Adaptation
As rounds progress, regularly evaluate your defense. What worked on Round 15 might fail on Round 45. Adapt tower roles: for example, early on your Dart Monkeys handle most popping, but later they might serve mainly to pop Black Bloons spawned from bombed Rainbows (a support role). If you notice certain bloons consistently leak (e.g. fast yellows dart past your slow-firing cannons), respond by adding a fast tower (like more darts or a Super Monkey) or a slowing mechanism (glue/ice) specifically for them. Being proactive is the mark of a master player -- don't wait until you lose lives to adjust your strategy. By Round 40+, have a plan for Rainbows (lots of layered DPS and coverage) and know that Round 50 will be an endurance test of everything: huge bloon swarms of all types. For the final rounds, don't hoard money -- spend it on whatever will shore up your weaknesses.
Master BTD2 and Beyond
Keep in mind that BTD2 is a game of strategy and adaptation. There is no single fixed solution; the best players mix and match tactics like the ones above and tweak their approach based on what the game throws at them. Use this guide as a toolbox -- combine these insights to forge your own winning strategy. With practice, careful planning, and the right tower combos, you'll be popping bloons well into the high rounds and conquering Bloons Tower Defense 2 like a true master. Good luck and happy bloon popping!
