How to Beat BTD6 Boss Events — All 5 Bosses Guide (2026)

BTD6 Boss Events are limited-time game modes where a massive bloon boss appears mid-map and forces you to damage it while continuing to defend against regular bloon waves. Each boss has unique mechanics, specific weaknesses, and behavior that punishes standard tower setups. Knowing how each boss works before the event starts is the difference between clearing all five tiers and wiping on Tier 2.

This guide covers all five BTD6 bosses in 2026 — Bloonarius, Lych, Vortex, Dreadbloon, and Phayze — with the mechanics, best counters, and a strategy for clearing every tier.

How BTD6 Boss Events Work — Mechanics

Boss Events in BTD6 run on a rotating schedule — Ninja Kiwi cycles through all five bosses throughout the year, with each event lasting 3–5 days. Bosses appear in addition to normal bloon waves, not instead of them. You’re managing two threats simultaneously: the boss itself and the standard bloon rounds running in the background.

Each boss has five tiers. Higher tiers make the boss appear earlier in the round sequence (when your economy is weaker) and increase the boss’s total HP. The reward scales with tier completed:

• Tier 1: 200 Monkey Money
• Tier 2: 250 MM
• Tier 3: 400 MM
• Tier 4: 600 MM
• Tier 5 (Elite): 800–1,200 MM

Completing Tier 4 in every Boss Event earns roughly 600–800 MM per event. For the full Monkey Money farming strategy, see our Monkey Money guide.

Boss Events also run a Ranked (Elite) variant with harder bosses and trophy rewards for the top-placing players.

Best Towers for All BTD6 Boss Events

These towers deal good single-target DPS against any boss — useful as your general-purpose boss setup before specializing per boss:

• Dartling Gunner (4-0-2): Laser Cannon shreds boss HP consistently. Its targeted fire means every shot lands on the boss instead of spreading to nearby bloons.
• Super Monkey (2-0-5): True Sun God hits the boss with divine-tier damage and clears surrounding bloons simultaneously. Strong for Tier 4–5 bosses where the bloon wave pressure is highest.
• Sniper Monkey (0-2-0): Elite Sniper targets MOAB-class bloons (and bosses). The Full Metal Jacket cross-path at 3-0-2 strips boss HP consistently from anywhere on the map.
• Spike Factory (0-2-5): Permaspike stacks damage on the boss every time it walks over the pile. On maps where the boss crosses a specific exit point, a Permaspike trap there chunks significant HP passively.

Bloonarius Boss Guide — BTD6

Bloonarius is the slowest boss in BTD6 — it moves at a crawl but has enormous HP and spawns Bloonarius Blobs when hit. These blobs are mid-tier bloon groups (Ceramic and MOAB-class at higher tiers) that appear mid-path and can overwhelm defenses not expecting them.

Key mechanic: Every time Bloonarius takes a set amount of damage (the “skull” health thresholds visible on its HP bar), it drops a wave of blobs onto the path. These blobs follow the path independently of Bloonarius itself.

Counter strategy: You need two separate damage sources — one high-single-target DPS tower focused on Bloonarius itself, and one AoE damage tower handling the blob waves. A Dartling Gunner (4-0-2) focuses the boss while a Super Monkey (2-0-3) or Wizard Monkey (4-2-0) clears blobs.

Best hero for Bloonarius: Geraldo — his items add debuffs to Bloonarius and the blobs simultaneously, and his passive support scales into late tiers better than most heroes.

Lych Boss Guide — BTD6

Lych is the most unique boss in BTD6. It resurrects recently killed bloons, adding them back to the bloon wave as Undead Bloons. Undead Bloons move faster than their living counterparts and are immune to certain damage types. Lych also drains life from any ability-based attack directed at it — heroes who use abilities frequently near Lych get weakened temporarily.

Key mechanic: Do not use hero abilities within Lych’s range. Lych’s Soul Drain ability steals power from heroes using active abilities nearby — save hero abilities for bloon waves, not for boss DPS.

Counter strategy: Passive damage towers only. Dartling Gunner and Sniper Monkey deal consistent DPS without needing active abilities. Avoid ability-spamming setups (Gwendolin, Churchill) directly against Lych — the soul drain penalty isn’t worth it.

Best hero for Lych: Etienne — his UAV gives camo detection to all towers on the map (critical because Undead Bloons are camo), and his passive bonuses don’t trigger Lych’s soul drain.

Vortex Boss Guide — BTD6

Vortex is the fastest boss in BTD6. It moves at roughly 3x the speed of Bloonarius and generates an electrical storm aura that stuns towers it passes near. Any tower within Vortex’s stun radius gets disabled for several seconds as Vortex walks past — which means your damage towers stop firing right when the boss is closest to the exit.

Key mechanic: Spread your towers across the full path. If all your towers are clustered in one area, Vortex stuns them all simultaneously as it passes through. Distributed towers mean only 1–2 get stunned at any moment while the rest continue firing.

Counter strategy: Long-range towers placed far from the path center avoid the stun radius entirely. Sniper Monkey, Mortar Monkey, and Dartling Gunner all attack from a distance and largely avoid Vortex’s stun aura. Avoid melee-range tower setups (Sauda, Pat Fusty) for this boss specifically.

Best hero for Vortex: Quincy — his arrows deal consistent long-range damage without needing to enter Vortex’s stun range, and his Rapid Fire ability fires from max distance.

Dreadbloon Boss Guide — BTD6

Dreadbloon is an armored boss — it travels inside a rock shell that drastically reduces incoming damage. Only explosives and certain damage types penetrate the rock armor. Towers that rely on pierce-based attacks (Dart Monkey, Ninja Monkey) deal reduced damage until the rock shell is cracked at each HP skull threshold. When the shell cracks, a window of full damage opens briefly before Dreadbloon re-armors.

Key mechanic: Focus explosive towers on Dreadbloon — Bomb Shooter, Mortar Monkey, and Dartling Gunner bypass armor effectively. Pierce-based towers should focus on the bloon waves while your explosive setup chunks the boss.

Counter strategy: Bomb Shooter (2-0-3) at the widest curve combined with Mortar Monkey (0-2-3) targeting the same area creates overlapping explosive coverage that strips Dreadbloon’s armor efficiently. Stack this with Dartling Gunner for raw damage during the unarmored windows.

Best hero for Dreadbloon: Churchill — his passive cannon shots deal explosive damage that bypasses Dreadbloon’s armor, and his active ability adds a second explosive attack simultaneously.

Phayze Boss Guide — BTD6

Phayze is BTD6’s camo boss — it’s permanently cloaked and only visible to towers with camo detection. Any tower without camo detection ignores Phayze entirely, dealing zero damage regardless of DPS. Additionally, Phayze emits a camo aura that temporarily converts nearby bloons to camo, meaning standard bloons that your towers could normally hit become invisible too.

Key mechanic: Every tower in your setup needs camo detection when Phayze is on the map — not just one Monkey Village with MIB, but your primary damage towers too. A Dartling Gunner with no camo upgrade deals zero damage to Phayze.

Counter strategy: Build around towers with native camo detection — Ninja Monkey (camo by default), Sniper Monkey with Night Vision Goggles (0-0-1), Wizard Monkey (2-0-0). Place a Monkey Village (0-2-0) to give nearby towers MIB camo detection as backup.

Best hero for Phayze: Etienne — his permanent UAV at level 5 gives every tower on the entire map camo detection. This eliminates the biggest Phayze challenge and lets you run any damage setup without camo restrictions.

BTD6 Boss Event Rewards — Monkey Money and Trophies in 2026

Boss Event rewards in BTD6 in 2026 pay out across two tracks:

Standard events: Complete Tier 1–5 for 200–1,200 MM per event. Clearing through Tier 4 consistently is the most efficient MM-per-hour strategy. Tier 5 is significantly harder and may not be worth the time investment for casual players.

Elite Ranked events: Additionally reward Trophies based on leaderboard placement. Trophies unlock cosmetic items from the Trophy Store — hero skins, tower skins, and music tracks. These are purely cosmetic but track competitive performance.

Total MM from consistent Boss Event play: With 5 bosses rotating through the year, clearing Tier 4 on each earns roughly 3,000 MM per boss cycle. That’s enough to unlock 2–3 heroes per year from Boss Events alone.

For the complete Monkey Money earning strategy including where Boss Events rank against Contested Territory and Odyssey, see our Monkey Money guide.

For a full hero comparison to pick the best boss event hero for your playstyle, read our BTD6 best heroes guide.

Want to practice boss strategies without the time pressure of a live event? The BTD6 MOD APK lets you run any setup with unlimited cash — useful for testing boss counter builds before the next event goes live.

Frequently Asked Questions