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Battle Cats Wiki

I'll Be Bug (Merciless) is an Advent Stage unlocked after clearing Queen's Condemnation. It appears on the 1st, 2nd, 15th, and 16th of every month. When clearing this stage, there is a chance to unlock Slime Cat. This is a No Continues stage.


  • 2 Professor As spawn after 3.33 seconds100f, delay 143.33~146.67 seconds4,300f~4,400f.
  • Infinite Ginger Snaches spawn after 10 seconds300f, delay 14.67~21.33 seconds440f~640f.
  • 1 Queen Mother V spawns as the boss after 10 seconds300f.
  • 3 One Horns spawn after 40 seconds1,200f, delay 56~58.67 seconds1,680f~1,760f.
  • 1 Relic Doge spawns after 86.67 seconds2,600f.
  • 1 Relic Doge spawns after 160 seconds4,800f.
  • 2 Relic Doges spawn after 200 seconds6,000f, delay 12~16 seconds360f~480f.


Strategy 1 (cheese, Uberless)

Lineup: Green Shell Cat (50), Drama Cats (for combo only), Bony Bone+Biohazard combos, Roe Cat (33+5, no Talents beside Cost Down), Fishman Cat (48+3), Awakened Bahamut Cat (40), Power Cutter Cat(50), and Bullet Train Cat (50).

Items: Rich Cat

Notes: This strategy relies on the following things:

  • The Research Effect Up Combos make it so Roe's cooldown is exactly twice of Queen Mother V's attack rate, meaning that if one Roe doesn't get cursed, then none will, as they are already perfectly timed. This removes any need for timing skill. It also allows one Roe per 2 attacks, instead of one per 3 attacks, which is also a big difference, but you can try with other combos if your levels are higher and you trust your timing.
  • Due to cost problems, bringing a Rich Cat is mandatory, same for Roe's Cost Down Talent.
  • Breakerblast must be your Cat Cannon of choice and have a decent level.
  • If you have a good Uber Rare or Legend Rare that you believe would help, it is recommended to replace Power Cutter Cat instead of others.

Battle: Start by deploying a Green Shell. If you have a Sniper, let him hit Professor A. once, then turn it off for the rest of the fight. As soon as you have the money for it, summon Roe Cat; due to the aforementioned trick, no Roe Cat will ever be Cursed by the boss for the rest of the fight, if you do it well. As soon as Ginger Snache gets hit by Green Shell's rebound from the boss wave, summon Bullet Train, as it will intercept the peon and get more money (if it isn't one-shotted, either Green Shell or Bullet Train needs an higher level), then just spam Roes and never stop; as soon as one is ready to deploy, summon it without waiting.

Anv 26 01 2020 IBB 01.jpg

The next step is to wait for Awakened Bahamut to be ready; as soon as he is, let the boss attack twice, then get ready to summon both Power Cutter and Awakened Bahamut a bit before Queen Mother V's third attack, so the attack lands, then let the two rushers enter the blind spot. At this point, a One Horn will have broken your defense line, but these two will make quick work of him. After that, Awakened Bahamut should hit and knock back Professor A., then he can die. As soon as the anteater takes the knockback, use the Breakerblast to push him back even further, then start spamming Green Shell, Fishman, Bullet Train, Roe and Power Cutter to quickly kill the boss and win. DPS is relevant, so do not try to time your Fishmen, taking knockbacks; the boss is unpredictable, so just spam.

Final notes:

  • A. Bahamut has a chance to survive, but it is irrelevant.
  • If you do not have Curling Cat's True Form, add a Sniper.
  • If Professor A. doesn't get knocked back far enough for any reason, add a Sniper.
  • Move Speed Up and Attack Buff Talents on Fishman are not needed, but they could be added to make things faster in the end.
  • Knocking back the boss will throw off your rhythm with the Roes, but it will be too late.
  • Breakerblast level influences the area that gets affected. If Professor A. is outside of it, re-do it with no Sniper and use the Breakerblast while the boss is mid-knockback, so it should target behind directly.
  • You can try to replace Slapstick Cats with another cat for another Combo, as long as it makes a combo with an already present cat, like Sportswoman, but you would need to add Sniper and, maybe, re-learn some timings on your own.
  • If you do everything well and with the right levels, you can win consistently.
  • If you DO win, Enjoy your Leadership, 30 Cat Food, platinum Meow Medal, and if lucky, Slime Cat!

Strategy 2 (Uberless)

Lineup: Eye of the Storm Combo, Team of Two Combo or 2 Defense Up (Sm) combos, Manic Island Cat (Lvl. 40), Roe Cat (Lvl. 40), Maglev Cat (Lvl. 30), Power Cutter Cat (Lvl. 30), Awakened Bahamut Cat (Lvl. 30)

Items: Rich Cat

Cannon: Thunderbolt Cannon. If you intend to replace Awakened Bahamut with an anti-red uber instead, consider using Curseblast if available.


  • The levels listed are minimum usable. The higher your units' levels, the better.
  • Roe Cat requires no Talents, but Cost Down and Defense Buff will help a lot.
  • Maglev Cat is here only to snipe Ginger Snaches for double cash, so its level doesn't matter.
  • It is recommended to beat An Ancient Curse and get Awakened Bahamut to lvl. 40, as he should take as much health off of the first Professor A. as possible.
  • The Thunderbolt Cannon's level doesn't really matter, but the higher the level is, the easier it is to time Awakened Bahamut.
  • If you don't have Power Cutter Cat, you can use Fishman Cat instead, but in this case you need a bit higher level Manic Island Cat, as you need to kill first Prof. A before another one comes.
  • You also can use Bullet Train Cat if you don't have Power Cutter Cat, but in this case Bullet Train will be used not only for double money from Ginger Snaches, so you should want to have it leveled up.

Battle: At first wait for the initial Ginger Snache to come close to your base, then send out Manic Island, wait for it to attack Ginger Snache 2 times, then deploy Maglev to get double cash from killing it. After Ginger Snache dies, send out Roe. Keep spamming Roe, Cutter Cat and Manic Island (Important note: you have to be able to time Roe cats to not let them get cursed, for this, deploy them right when Queen Mother V starts her attack). Use maglev to snipe Ginger Snaches and get double cash from them. When One Horncomes, Manic Islands and Roes will eventually finish him off. After One Horn dies, you will have enough cash to deploy A. Bahamut. Be very careful, as this part is one of most important moments in the battle. First of all, make sure that no peons are protecting Prof. A. If there are no peons, wait for Queen Mother V to attack, and send A. Bahamut. After you send A. Bahamut, fire the Thunderbolt Cannon. A. Bahamut will land some hits on Prof. A, then gets knocked back and land a hit again before dying. If you get lucky and Roe weakens Professor A, A. Bahamut will be able to land 3 hits, taking an even bigger chunk of Prof. A's health. After that, Manic Islands, Cutters and Roes will do the rest, just keep spamming them. You can repeat the Thunderbolt + A. Bahamut timing when 2nd Prof. A is in front of Queen, but it is not necessary, as a single Prof. A is not a problem.

Enjoy your Leadership, 30 Cat Food, platinum Meow Medal, and Slime Cat!

Strategy 3 (ft. Eva-02)

Lineup: 2 Research Up(Small) combos or 1 Research Up(Medium) combo, Roe cat(37+3), Bullet Train Cat(40), Can Can Cat(40+8), Manic Island Cat(40), Eva Unit-02(40), Awakened Bahamut Cat(30)

Items: Rich Cat is helpful but not mandatory

Cannon: Thunderbolt Cannon

Notes: This strategy relies on the following things:

  • The Research Effect Up Combo: Either one Research Up Medium or two Research Up Small would reduce Roe's cool down to the point that it is exactly twice of Queen Mother V's attack rate, making your timing of the following Roe cat consistently easier if your first Roe doesn't get cursed. However, take note that after Queen Mother V is knocked back, the timing will need to be calibrated.
  • The Bullet Train Cat: It makes a huge difference as it can knock back the relic doges and deal decent damage to it, making it easier to finish them off.
  • Eva-02 is the major savior in this strategy: Eva-02 has a speed of 15 units, being very close to the speed of roe cat, 16 units. Thus the timing of Eva-02 can be exactly the same as that of Roe. Moreover, the long-range ability of Eva-02 makes it possible for her to reach Professor A despite having 100 range units shorter than the latter. Make sure to deploy Eva-02 only when One Horn is pushing close to your front line so that Eva-02 can use it as a stepping stone to land more hits on professor A.
  • Last but not least, don't panic. Keep in mind that any unit cursed by Queen would be rendered nearly useless so timing is the most important of all when deploying units.

Battle: Start by upgrading your wallet to lv 2 while waiting for the first Ginger Snache to come close to your base, then send out Manic Island. The Manic Island will finish off the Ginger Snache and delay Professor A for a short period of time. Wait until the second Ginger Snache comes close to your base and deploy the second Manic Island. At this point, Queen Mother V's attack should just reach the frontal area of your base. From then on, time the Roe, Can can and Manic Island and send them out as soon as Queen rises to the sky to initiate her attack animation. Keep spamming. Roe, Manic Island and Can can. You may use Bullet Train to deal extra damage to Professor A as well as to snipe Ginger Snache for extra cash. However, make sure that your Bullet Train is deployable whenever relic doge comes so that Bullet Train can knock it back and make it easier to finish it off. When One horn almost reaches your roe cat, send out your Eva-02 but also don't get it cursed using the above mentioned timing strategy. Prioritize spamming Roe if money becomes an issue. Once One Horn dies, make sure no peon is in front of Professor A, time your A. Bahamut and fire thunderbolt briefly after he is sent out. The first Professor A should be knocked back or even dead if your Eva-02 has landed enough hits on him. Rinse and repeat for the second Professor A. Queen Mother V can then be easily defeated without support from Professor A.

Enjoy your leadership, 30 cf, platinum Meow Medal and if lucky, Slime Cat!

Strategy 4 (Ft. Sharpshooter Saki)

Can Can Cat (41, Level 2 Speed Up Talent, Level 1-2 Attack Up Talent), Manic Island Cat (30), Roe Cat (36, Level 2 Cost Down Talent), Awakened Bahamut Cat (30), Sharpshooter Saki (28)

Cannon: Curseblast (1, does require decent timing)

Although it might seem tempting to bring Rich Cat, this strategy is more consistent without Rich Cat.

Start off by leveling up your Worker Cat twice, and then immediately spawning Manic Island Cat once you have enough cash. After that, spawn Roe Cat once you have enough cash. Once Manic Island Cat comes off cooldown, delay a bit, as if you spawn it right off cooldown, he will get cursed. After that, spawn Manic Island Cat. If you keep spawning Manic Island Cat right off cooldown with Queen V in place, he'll always stay uncursed, so keep that in mind. Spawn Roe Cat alongside Manic Island Cat to shield against Professor A. Once One Horn spawns, start spawning your Can Can Cats to make quick work of those rhinos. Once you kill the rhino, send out Sharpshooter Saki and time her so she can invade Queen V's blindspot uncursed. She should deal decent damage to the Professor A. before the Relic Doge spawns. From there, it's more of spamming your Roe Cats and Manic Island Cats, while occasionally spawning Can Can Cats for the Relic Doges and One Horns and Saki if you have enough cash. You can use Awakened Bahamut Cat if you have enough cash to kill the One Horn quickly. Use Curseblast to save some of your cats from getting cursed, Roe Cat and Manic Island Cat are super flimsy without their ability. Repeat until the Professor As die. After that, spawn Fishman Cat, Can Can Cat, etc. until you finish the stage.


  • The name of this stage is likely a direct reference to the Arnold Schwarzenegger quote "I'll be back", which was first used in the acclaimed sci-fi movie The Terminator.



Special Stages
Daily Stages
Normal Stages Monday Stage (Rich Cat) • Tuesday Stage (Speed Cat) • Wednesday Stage (Cat Jobs) • Thursday Stage (Sniper Cat) • Friday Stage (Helpful Cat) • Weekend Stage
Blitz Stages Monday Blitz StageTuesday Blitz StageWednesday Blitz StageThursday Blitz StageFriday Blitz Stage
Guerrilla Stages
Cat Ticket Guerrilla Love, Metal Hippoe (Hard)Super Metal Hippoe (Expert)Steel Visage (Deadly)Forged to Kill (Deadly)
XP Guerrilla XP Stage/Weekend StageXP Megablitz!XP ColosseumMerciless XP!The Proving Grounds (First Round (Easy)First Round (Expert)First Round (Deadly))
Catfruit Guerrilla Growing Green (IIIIII) • Growing Purple (IIIIII) • Growing Red (IIIIII) • Growing Blue (IIIIII) • Growing Yellow (IIIIII) • Growing Strange (IRedFloatingBlackAngelAlienMetalZombie) • Growing Epic (III) • Catfruit JubileeCatfruit Buffet
Material Guerrilla Cavern of Comets (IIIIII) • Island of Ash (IIIIII) • Strait of Wings (IIIIII)
Enigma Guerrilla Isle of the Map Lord (IIIIII)
Cyclone Stages
Solo Fights Attack on R-Cyclone (Expert)Attack on B-Cyclone (Expert)Attack on W-Cyclone (Expert)Oncoming Maelstrom (Expert)Attack on Titanium (Insane)Black Hole Rising (Insane)Oncoming Storm (Insane)Unholy Tempest (Insane)The Wormhole Opens (Deadly)Wrath of Hell (Deadly)Charybdis' Mouth (Merciless)
Dual Fights Bad to Worse (Tragedy in Red (Insane)Doom Paradise (Insane))
Day of Judgement (Explosion in the Sky (Insane)Acts of Cat-God (Insane))
Techneurosis (Nuts 'n' Bolts (Expert)Space is the Place (Insane))
Advent Stages
Solo Fights Tier 1 No Plan A (Deadly)Realm of Carnage (Deadly)Honey Trap (Deadly)Parade of the Dead (Deadly)
N-1 Grand Prix (Deadly)Bombergirl (Deadly)Puffer Planet (Merciless)Flow Like the Stream (Merciless)
Possessed by Evil (Merciless)
Tier 2 The Pure Land (Merciless)Saintly Sister (Merciless)I'll Be Bug (Merciless)Dogsville (Merciless)
Last of the Dead (Merciless)Baby Fake (Merciless)
Dual Fights The Angel & The Demon (No Plan A (Deadly)Realm of Carnage (Deadly)
The Queen & The Dead (Honey Trap (Deadly)Parade of the Dead (Deadly)
The King & The Maiden (N-1 Grand Prix (Deadly)Bombergirl (Deadly))
Crazed Stages
Crazed Cats Dark Souls (Insane)Absolute Defence (Insane)Berserk (Insane)
Festival Gross (Insane)Head Shaker (Insane)Flappy Cat (Insane)
Fish Hell (Insane)Mammals? (Insane)Crazy Cats (Insane)
Manic Cats Deathhawk (Deadly)Vulcanizer (Deadly)Unjust War (Deadly)
Muscle Party (Deadly)Lots O' Lion (Deadly)Forest Beasts (Deadly)
Ogre Island (Deadly)Draconian (Deadly)Resident Feline (Deadly)
Clan of the Maniacs The Wild Dance (Deadly)Insane Rhythms (Merciless)
Awakening Stages
Buyable Cats Actress AwakensKung Fu AwakensMr. AwakensBondage AwakensThe Dom Awakens
Box Cats AwakenPanties AwakensNinja AwakensZombie AwakensSamurai Awakens
Sumo AwakensBoogie AwakensSkirt Awakens
Monthly Cats Adult Cat AwakesEvil Cat AwakesDoll Cats AwakeMaiden Awakes
Koi AwakensBride AwakensVacation AwakesVengeance Awakes
Kung-Fu X AwakensSports Day AwakensSalaryman AwakesReindeer Fish Awakens
Li'l Cats Tiny Meows (Deadly)Tiny Will (Deadly)Tiny Chopper (Deadly)
Tiny Creeper (Deadly)Tiny Horns (Deadly)Tiny Wings (Deadly)
Tiny Fins (Deadly)Tiny Tail (Deadly)Tiny Fists (Deadly)
Cyclone Cats Crimson VengeanceNEO Darkness HeavenPeerless Too
Wrath of the DivineBitter IronyDimension of Delirium
Red Sky At NightThe Dead Keep RollingThe 3rd Dimension
Advent Cats Clionel DominantRiver AcheronQueen's Condemnation
Dead by EncoreKing Wahwah's ReturnA Deeper Dream
Other Cats Tricycle AwakensCat Kart AwakensFlower Cat Awakens!Nekondo AwakensCatburger Awakens
Event All-Stars Stages
Special Thanks! (Insane)Ultra Stress! (Insane)Miracle Tactics! (Insane)Wonderful Conquest (Insane)Elite Corps (Insane)Megaton Blast (Insane)Presents of Mind (Insane)
Memorial Stages
Year's First Dawn • Happy Birthday (IIIIII) • Grats! 3 Years!!Joy of 20 Million!Joy of 30 Million!Joy of 40 Million!CAT DAYJoy & ProsperityJoy of 50 Million!Golden Week Special!!Joy of 60 Million!
Region Restriction
Punchy PrizefighterSecret DelicacyFaster Than Fast FoodWe're Number OneCola Flavor CatWafer Cat Advent
Unknown Schedule
Dark Descent I: Eastern Cave • II: Western Walk • III: Southern Fort • ∞: Northern Crater
Seeing Red I: Sands of the East • II: Wastes of the West • III: Peaks of the South • ∞: Ruins of the North
Duel Stages Duel on the Prairie (VanguardEliteCommander) • Duel at Sunset (VanguardEliteCommander) • Duel Under the Stars (VanguardEliteCommander) • Duel on the Dunes (VanguardEliteCommander) • Duel at the Lava Fields (VanguardEliteCommander) • Duel Under the Sea (VanguardEliteCommander)
Tag Arena Rookie (QuarterfinalsSemifinalsFinals) • Beginner (QuarterfinalsSemifinalsFinals) • Adept (QuarterfinalsSemifinalsFinals) • Pro (QuarterfinalsSemifinalsFinals) • Expert (QuarterfinalsSemifinalsFinals)
Total Wars Spring Special (BasicStandardAdvancedExaltedSupreme) • Summer Special (BasicStandardAdvancedExaltedSupreme) • Fall Special (BasicStandardAdvancedExaltedSupreme) • Winter Special (BasicStandardAdvancedExaltedSupreme)
Deadly Carnival Tornado Carnival (Deadly)Awakened Carnival (Deadly)
Deadly Carnival II Tornado Carnival II (Deadly)Awakened Carnival II (Deadly)
Deadly Carnival III Tornado Carnival III (Deadly)Awakened Carnival III (Deadly)
Heavenly Tower Floor 1Floor 2Floor 3Floor 4Floor 5Floor 6Floor 7Floor 8Floor 9Floor 10Floor 11Floor 12Floor 13Floor 14Floor 15Floor 16Floor 17Floor 18Floor 19Floor 20Floor 21Floor 22Floor 23Floor 24Floor 25Floor 26Floor 27Floor 28Floor 29Floor 30Floor 31Floor 32Floor 33Floor 34Floor 35Floor 36Floor 37Floor 38Floor 39Floor 40Floor 41Floor 42Floor 43Floor 44Floor 45Floor 46Floor 47Floor 48Floor 49Floor 50
Legend Quest LEVEL 1 - LAST LEVEL (randomized SoL stages & lineups)
Citadels Floor 1Floor 2Floor 3Floor 4Floor 5Floor 6Floor 7Floor 8Floor 9Top Floor
Gauntlet Stages
General Baron Seal Strikes Baron Seal Strikes!: Red Alerts 1~20 • Baron Seal Strikes!!: Red Alerts 21~40 • Baron Seal Strikes!!!: Red Alerts 41~60
Le'Grim Strikes Le'Grim Strikes!: Rampage Lv1~20 • Le'Grim Strikes!!: Rampage Lv21~40 • Le'Grim Strikes!!!: Rampage Lv41~60
Mega Menace Mega Menace!: On Mighty Wings Lv.1~20 • Mega Menace!!: On Mighty Wings Lv.21~40 • Mega Menace!!!: On Mighty Wings Lv.41~60
Horrorpotamus Horrorpotamus!: Cosmic Juggernaut Lv.1~20 • Horrorpotamus!!: Cosmic Juggernaut Lv.21~40 • Horrorpotamus!!!: Cosmic Juggernaut Lv.41~60
Seasonal A Colossal New Year!A Colossal Valentine'sSuffering Spring!Summer Break Cats
Monthly June GauntletJune Gauntlet IIJuly GauntletJuly Gauntlet IIAugust GauntletAugust Gauntlet IISeptember GauntletSeptember Gauntlet IIOctober GauntletOctober Gauntlet II
Other Special Stages
The Battle Cats POP! Poppin' in 3D!Fight your Friends!Player VS PlayerPay Only Once!No I-A-P!Get Those UbersConquer the GalaxyAt Nintendo eShop!
Mystery Package Sender Unknown
BitSummitBCJP Only Held in Miyako Messe! (2016)Held in Miyako Messe! (2017)Held in Miyako Messe! (2018)One more thing... (2018)Held in Miyako Messe! (2019)One more thing... (2019)
The Battle Cats Together! Play Battle Cats Together!Team Up & Win!Over 350 Cats!Play All you Want!Legend Stages Too!Minigames Galore!At the Nintendo eShop!But the App's Fun Too :)
Most Defeated 2019 Surprising #5Not Uncommon #4As Expected #3Runner-Up #2Unbelievable #1Unseen in 2019
Most Appearances 2020 Congrats on #5#4 As ExpectedSomehow #3#2 Out of Nowhere#1 Thanks to You!No New Appearances
Empress' Research Arcane ConfluenceServant of DarknessDemon's ParkWicked CatWicked TankWicked Axe