Our Lethal Puzzle Lab Solutions Guide will run you through all of the answers for each of the puzzles listed in the Lethal section of the Puzzle Lab! We have a full list of the puzzles, as well as the answers and some tips to help you get through the lab.
The Lethal Lab will be the most familiar to players. These are the type of puzzles you are facing in-game, and when you are watching streams or playing some user made puzzles on the web. Here’s the official description from Blizzard:
In this experiment, the assistant is tasked with neutralizing the opponent in one turn using the cards at their disposal. We expect this will provide valuable insights into the destructive properties of many of our inventions.
Our Other Puzzle Lab Guides
- Survival Puzzle Lab Solutions Guide
- Board Clear Lab Solutions Guide
- Mirror Lab Solutions Guide
- Dr. Boom Puzzle Lab Solutions Guide
Lethal Puzzle Solutions, Answers, & Puzzle List
We’ve got all of the solutions to the Lethal Puzzles listed below! Be sure to follow each step carefully, order can be important depending on the puzzle.
Poisonmaster Pollark Lethal Puzzles Answers & Solutions
Puzzle #1 – Cold Blooded
- Hero Power.
- Deadly Poison to buff the weapon.
- Cold Blood your Bluegill Warrior and hit the opponent with both.
Puzzle #2 – Frostbite
Puzzle #3 – Battle Boar
- Play Stonetusk Boar.
- Give it Windfury.
- Buff it with Abusive Sergeant and Rockbiter Weapon.
- Attack opponent twice.
Puzzle #4 – Stand By Me
- Kill Ironfur Grizzly with 3/1 Stonetusk Boar.
- Kill Shieldbearer with 4/1 Bluegill Warrior.
- Play your Charge minions NEXT TO Flametongue Totem one by one and attack with them to kill the opponent.
Puzzle #5 – Frothing Fighters
- Play 2x Rabid Worgen.
- Use Whirlwind.
- Kill Ironwood Golem with two Worgens.
- Use Hero Power.
- Shield Slam your Frothing Berserker.
- Hit your opponent for lethal.
Puzzle #6 – Leeroy Returns
- Play Leeroy Jenkins.
- Use Reincarnate on Ticking Abomination.
- Hit opponent with Leeroy.
- Use Reincarnate on Leeroy and hit your opponent again for lethal.
Puzzle #7 – Cosmic Fire
- Play Cosmic Anomaly.
- Arcane Blast the 1/5 Taunt.
- Use Coin.
- Play Celestial Emissary. Order is important, FIRST Coin and THEN play Emissary!
- Fireball your opponent.
- Hit with Mana Wyrm for lethal.
Puzzle #8 – Full Draw
- Play Carnivorous Cube on Clockwork Automaton.
- Use Play Dead on Cube.
- Hunter's Mark the Cube.
- Arcane Shot the Cube.
- Hero Power (32 damage) for lethal.
Puzzle #9 – Plan B
- Play Back-up Plan and enjoy the explosive show!
Myra Rotspring Lethal Puzzles Answers & Solutions
Puzzle #1 – Quick and Quiet
- Silence your Stranglethorn Tiger with Ironbeak Owl.
- Hit opponent with all the minions.
- Hero Power for lethal.
Puzzle #2 – Dinosaur Domination
- Potion of Madness on Frostwolf Grunt to kill the second Grunt.
- Hit your opponent with Sylvanas Windrunner.
- Shadow Word: Death your Sylvanas.
- Hit the opponent with King Krush.
- Use Mind Blast + Holy Smite for lethal.
Puzzle #3 – Hot Potato
- Hit Spud M.E. with your Wisp.
- Play Blood Razor.
- Use Inner Rage on Frothing Berserker.
- Kill Spud M.E. for lethal.
Puzzle #4 – A Dim Flame
- Play Bloodmage Thalnos.
- Frostbolt the Ironfur Grizzly.
- Hero Power (ping) the 2/3 Gurubashi Berserker.
- Forbidden Flame the 5/2 Gurubashi Berserker.
- Hit the opponent with both Berserkers for lethal.
Puzzle #5 – Lethal Lepers
- Backstab the Pompous Thespian.
- Hit opponent with both minions.
- Shadowstep your Kobold Geomancer and replay it.
- Play Leper Gnome and Backstab it.
- Hit your opponent with Razorpetal and Sinister Strike for lethal.
Puzzle #6 – The Wall
- Rampage your Grommash Hellscream.
- Play Bloodmage Thalnos.
- Use Shield Slam on Lord of the Arena.
- Use Whirlwind.
- Hit Abomination with your weapon.
- Hit your opponent with Grommash for lethal.
Puzzle #7 – Four Horsemen
- Play Uther of the Ebon Blade.
- Play Battery Pack to refresh your mana.
- Hero Power.
- Play Blackwald Pixie.
- Hero Power.
- Play Auctionmaster Beardo.
- Play Battery Pack to refresh your mana & Hero Power.
- Hero Power.
- Hammer of Wrath your Glow-Tron.
- Hero Power for lethal.
Lil’ Stormy Lethal Puzzles Answers & Solutions
Puzzle #1 – Light and Fire
- Hit Booty Bay Bodyguard with your 1/1 Recruit.
- Play Wild Pyromancer.
- Play Consecration.
- Hit opponent with Tirion Fordring.
- Play Bluegill Warrior and hit opponent with it.
- Use Equality and hit your opponent with weapon for lethal.
Puzzle #2 – Hostile Hoppers
- Play Sonya Shadowdancer.
- Play two Pogo-Hoppers from your hand.
- Backstab the 1/1, Eviscerate the 3/3.
- Play Coin and two more Pogo-Hoppers.
- Shadowstep your the 5/5 Pogo-Hopper and replay it.
- Use Breakout and attack face with all minions for lethal.
Puzzle #3 – A Corrupted Spirit
- Play Radiant Elemental.
- Inner Fire the Auchenai Soulpriest.
- Play Circle of Healing.
- Play Potion of Madness to steal it.
- Use 2x Divine Spirit + Inner Fire.
- Hit your opponent for lethal.
Puzzle #4 – The Best Offense
- Play Cornered Sentry, Drywhisker Armorer, Armorsmith and Eternium Rover.
- Use Whirlwind.
- Use Charge on your Rover and run it into Wrathguard.
- Shield Slam the Wrathguard for lethal.
Puzzle #5 – Healing Hammers
- Play Defender of Argus to the left of Cure-All.
- Play Elven Archer on Tentacle of N'Zoth.
- Play 2nd Elven Archer to hit your Stormwind Knight.
- Use Healing Rain.
- Attack with Cure-All and Stormwind Knight.
- Lightning Bolt + Coin + Lightning Bolt for lethal.
Puzzle #6 – Toasted Hydra
- ORDER IS IMPORTANT!
- Play 2x Wild Pyromancer.
- Play Commanding Shout.
- Play Coin.
- Hit your opponent with weapon.
- Use Blood To Ichor on Bittertide Hydra for lethal.
Puzzle #7 – C’Thun! C’Thun! C’THUN!
- Play Beckoner of Evil.
- Play Spirit Lash.
- Use Shadow Madness on Cult Sorcerer and hit opponent with it.
- Play Circle of Healing.
- Play 2nd Spirit Lash.
- Use C'Thun for lethal.
Electra Stormsurge Lethal Puzzles Answers & Solutions
Puzzle #1 – Tossing Taters
- Play Skaterbot on the left side of Spud M.E. (Magnetic).
- Hit River Crocolisk with SPUD M.E.
- Hit SPUD M.E. with Stampeding Kodo.
- Play Blackwing Technician, Shieldbearer, 2x Coin and THEN Twilight Drake (order is important).
- Use Defile for lethal.
Puzzle #2 – Pride’s Fall
- Play Timber Wolf, Swamp Leech and Savannah Highmane.
- Attack opponent with all of your minions.
- Coin + Kill Command on your Savannah Highmane.
- Attack opponent with two 3/2 Hyenas for lethal.
Puzzle #3 – Keepers of the Gate Solution
- Mortal Coil the Goblin Bomb.
- Use Defile.
- Use Hellfire.
- Attack with the three Doomguards for lethal.
Puzzle #4 – A Shaman’s Strength
- Play Flametongue Totem between Taunt Totem and Emerald Reaver.
- Run Taunt Totem into Bittertide Hydra’s Divine Shield.
- Run Leper Gnome into Bittertide Hydra.
- Trade Emerald Reaver with a buffed Bomb Squad.
- Play Crushing Hand on Hydra.
- Buff Tunnel Trogg with Rockbiter Weapon and hit opponent for lethal.
Puzzle #5 – Selective Stampede
- Play Faceless Manipulator on the opponent’s Tundra Rhino.
- Play Bloodfen Raptor, Emerald Hive Queen and run those two into Abomination, killing it.
- Play Timber Wolf, hit the opponent with every minion for lethal.
Puzzle #6 – Spell Addiction
- Play Counterfeit Coin.
- Backstab your Mana Addict.
- Play Razorpetal Volley.
- Use Razorpetal on Hoarding Dragon.
- Use Eviscerate on Hoarding Dragon.
- Play 2x Coin.
- Use Shadow Strike on the opponent.
- Razorpetal the opponent.
- Hit with Mana Addict for lethal.
Dr. Boom’s Lethal Puzzles Answers & Solutions
Puzzle #1 – Of Pirates and Patrons
- ORDER IS SUPER IMPORTANT!
- Play Super Soldier (pre-nerf Warsong Commander), Frothing Berserker, Fiery War Axe, 2x Dread Corsair.
- Run 2x Dread Corsair into Sludge Belcher.
- Run a 3/2 Grim Patron into 1/2 Slime.
- Use Whirlwind.
- Slam a 3/3 Patron.
- Attack with everything for lethal.
Puzzle #2 – Erratic Explosive
- Play Wild Pyromancer.
- Buff it with Power Word: Tentacles.
- Play Circle of Healing.
- Play the 0 mana spell that refreshes your mana.
- Play Holy Smite on Spud M.E.
- Play Violet Teacher.
- Play 2x Defile for lethal.
Puzzle #3 – Never Go Full Northshire
- Play Power Word: Shield on the opponent’s Northshire Cleric (the last card in your deck is Wild Pyromancer)
- Play Lab Recruiter on your Northshire Cleric.
- Play Wild Pyromancer.
- Play Elven Archer on your Lab Recruiter.
- Play Battery Pack (0 mana refresh your Mana Crystals).
- Play Fungal Enchanter, draw three Clerics.
- Play three Clerics.
- Play Binding Heal on any of your minions.
- Use The Swap to swap boards.
- Play Treachery on your leftover Northshire Cleric.
- Play Circle of Healing for lethal.
Puzzle #4 – Full Northshire
- Use Undercover Reporter to put two copies of Northshire Cleric on the top of your deck.
- Use Elven Archer on any minion.
- Power Word: Shield the Elven Archer.
- Play Northshire Cleric and Hero Power the damaged minion to draw the last 2 cards in your deck.
- Play Northshire Cleric.
- Refresh your mana with Battery Pack.
- Swap the boards with The Swap.
- Play Wild Pyromancer.
- Use Treachery on the final Cleric on your side of the board.
- Play Fungal Enchanter.
- Heal 1 health minion (Undercover Reporter) with Binding Heal.
- Play Circle of Healing.
The solution for the second Dr Boom puzzle is incorrect. I followed it carefully and it just makes the SPUD M.E. explode on me and not the opponent.
The correct way to do it is
1. Play Wild Pyromancer.
Buff it with Power Word: Tentacles.
2. Do not play circle of healing.
3. Play the 0 mana spell that refreshes your mana.
4. Play Holy Smite on Spud M.E.
5. Play Violet Teacher.
6. Play 2x Defile for lethal.
There is a second solution to the second lethal doctor boom puzzle…
1. Place your teacher
2. Use you two damage spell on the bomb
3. Use double health on any minion
4. Place spider
5. Refresh mana
6. Place pyromancer
7. Play either of the two spells remaining, not defile
This kills the bomb because it cannot switch sides because your bird is full even though some of your minions die.
Another great guide. Thank you for making this content bearable.
I didn’t start with undercover reporter. How do you get it
All that and all you get is the card back? sure thought it would have more of a prize for finishing
PUZZLE #2 – ERRATIC EXPLOSIVE
You can fill your side the board with minions, when he the bomb tries to switch it blows up
For Doctor Boom’s final Lethal puzzle I didn’t get Pyromancer at all???
It’s in your deck
These puzzles are supposed to be fun?
Apparently so. I’ve found it boring and tedious though, Hopfully it’s just a one-off and next release has something more entertaining,
Can’t do #5 Lil’Stormy, please help, instructions don’t seem specific enough
What do you mean by “don’t seem specific enough”? They describe everything you need to do step by step, if you follow them to the letter, you should be able to get through that level.
If you still have a problem, let me know where exactly. What you do in the game and in what way the solution here doesn’t work for you.
Actually, no you won’t. The way the instructions are written, you won’t do enough damage to the hero with Healing Rains – only 8 points. With the two attacks (you don’t mention) and the two Lightning Bolts you will deal 12 more so Stormy survives with 5 points. You can do better using the 2nd Archer on the remaining Tentacle, but Stormy still survives with 1 point!
So, here’s my solution:
1: Play Defender of Argus between Cure-All and Tentacle of N’Zoth.
2: Attack Stormy with Cure-All and Stormwind Knight. (6 damage).
3: Play Elven Archer on 1/1 Tentacle of N’Zoth. (Does 1 damage to all minions.)
4: Play 2nd Elven Archer on Cure-All or Defender of Argus.
5: Play Lightning Bolt on Stormwind Knight.
6: Play Healing Rains. (Heals 8 points – 16 points damage to Stormy).
7: Play Coin + Lightning Bolt for Lethal.
I’ve added the step about attacking with the minions, but other than that it works perfectly. You must not be following a step correctly.
Healing Rain should do 14 damage to Stormy, leaving it at 11 Health. Two bolts + attacks = 12 damage for lethal.
How do you beat dr.booms 3 Lester puzzle I just run out of cards and die
So, one thing I noticed is not every puzzle has just one solution. I played through just the first lethal and there were 1-2 that I realized I did something different on.
Puzzle #8 – Full Draw
Play Carnivorous Cube, targeting Clockwork Automaton.
Play Play Dead, targeting Carnivorous Cube.
Play Hunter’s Mark, targeting Carnivorous Cube.
Play Arcane Shot, targeting your Carnivorous Cube.
Use your Hero Power, Steady Shot, which now deals 32 damage.
or you can hero power -> pixie -> hero power -> arcane shot face (he only has 9 hp)
Lethal puzzle 8/9, pollark has 30 hp how am i supposed to defeat him and is he meant to have 30 health
Updated the solution for 32 damage version. I have no clue why he has different life total for different players…
A DIM FLAME.
Is Bugged?!? Its a 2/3 and 2/1 theres no way to ping it or attack.
How is there no way to ping? Use your Hero Power to ping it. I just tried this one and it worked with the instructions listed.
Hello Stonekeep,
Ur solution for the infinite Northsire lethal puzzel isn’t right. Tried it multiple times. U start with 2 minions. U play lab and elven so that is 4 minions with pyro u will lose these 2 so u stuck on 3 than u play fendal and 3 northshires and got 7 minions on board. U swap the board. U have a damaged nortshire than that u can’t lose by treachery because of a full board. Than u will circle and u fatique yourself. Hope u have a better solution^^
“U have a damaged nortshire than that u can’t lose by treachery because of a full board”
But you can! Treachery kills it when your opponent has a full board, so you won’t take any fatigue damage.
It’s probably not the most optimal solution, but it worked for me.
Treachery does destroy it and it works nicely, thank you so much, I was pretty stuck on that one :DDDDDD
I actually had different solution for that one. 😀 Trearchery pyro then when clerics are on board i swapped it and circle healed.
You can give away the extra via treachery to kill it
Found a solution. He was talking about the second part of the battle, which gives the boss 999 hp after you defeat him in the first part. in the first part, elven archer into sylvanus, the fungle enchanter. use the minoin that copies 3 to copy the cleric. power word sheild the enemy cleric, then play the cleric you draw, then pyromancer. use the mana recovery spell, then hero power your first cleric to draw the last 2. play only one (you only have space for one) then use binding heal on any cleric. play the last cleric, swap sides, then give him the cleric. use circle of healing and he fatigues to death.
keep one of the north shire clerics in your hand to leave the open spot on the board. I was following it to a T for like 10 tries trying to see what I was doing wrong and realized I didn’t need to play all of the clerics
Worked like a charm for me.
He has 14 health for puzzle 8 the 4 steps don’t deal enough damage for lethal
For hunter. Again Pollark
Against**
Play cube than play dead use mark and arcane shot and hero power for 32 dmg
Electra puzzle doing all steps but spud doesnt die when it switches so i end the puzzle with no mana one defile and no dead electra
Hey, I just used the guide to do this one and it worked fine. Make sure you are following the steps exactly in order!
I think before the defile , you forgot to mention hit dpud m.e with stampeding kodo. Would be glad if you fix it.
this is all for just a cardback??
Dr. Boom 4/4 how is it able to beat him while u have the same combo?
Just added a solution to the guide, refresh the page!
thanks:D was just right in this moment when i posted it:D
I did it and dr boom had 438 health after combo =/
ok, now im really stuck on dr boom #4. how do you do it?
Just added a solution to the guide, refresh the page!
Stuck at Boom’s #2, the Priest millone, where he has 435 hp snd you have a Pyro in the deck. How to mill him enough?
i need help for the last one against dr.boom
PUZZLE #3 – NEVER GO FULL NORTHSHIRE
Shuffle clerics first, elven archer anything, pw:shield archer, play cleric, heropower on damaged minion, play clerics, refill mana, shuffle boards, play 3/2, Trearchery Cleric, play 3/3, Heal thing that is gonna be 1/1, Circle! Boom is -36. Also, dont archer yourself
NOTE: this also works for the 4th puzzle.
Had to do this twice, but solution worked until you get cleric in the shuffle.
I guess this doesn’t work anymore? PW:Shield doesn’t trigger the Cleric’s draw a card.
for the love of god please tell me how to solve never go full northshire. i can’t figure it out for the life of me.
copy northshire, power word shield northshire to draw northshire #2
play northshire #2, elven archer buffed northshire and hero power it for draw. Hope for pyro.
play northshires and swap minions.
refresh mana and play pyro + treachery the 1 northshire on your board.
fungal unchanter into circle into binding heal = profit
Bro help me, I’ve tried everything but when I try to heal northshire I can’t draw. I don’t know if it is a bug but it doesn’t work for me. Give me another solution please otherwise I can’t continue ????
Do you mean when you PW:Shield the Cleric? If so, I hit the same roadblock. I don’t think this puzzle is beatable.
PW:Shield doesn’t trigger Cleric’s draw a card (anymore… did it ever?)
nevermind figured it out 🙂
You must watch Rick & Morty if your IQ is that high.
No seriously, “i found it by accident” is the best lie you can come up with ? x)
Not enough mana for the solution to first lil stormy puzzle. Pyromancer 2mana, consecration 4mana, bluegill 2mana, (8mana already now), needs 4 more mana for trusilver champion but only have 2 more mana…. wtf?
Use pyromancer to kill Fordring to get Ashbringer for 5 more dmg
You need to hit the 5/4 with the 1/1, Pyro+cons, hit with the 6/6, then equality, which will equip the 5/3 weapon, and all face.
PUZZLE #6 – TOASTED HYDRA is impossible can only do 23 dmg ???
She should lost health up to negative number
Yeaaa same for me 23 damage cant think of anything
yeah I have the same issue … you cannot finish this quest.
Are you doing it in the exact order as specified? I just tested it and it worked fine.
when it says hit enemy hit the hero not the minion, got stuck on that for ages too 🙂
How do you do the second lethal part of electra’s part?
lol my bad I didn’t refresh ty dud
Solution for Dr. Boom? He’s the only left
Puzzle #1 – Tossing Taters is wrong.
just need to attack the bomb with the kodo once you attacked the crocodile with the bomb
Sorry, missed one step, it should be ok now.
Pretty sure he left out the step after attacking with SPUD ME where you attack the SPUD ME with rhino boy, bringing rhino down to 4 health and spud me down to 6.
yeah he updated it :p my bad for the late comment, didnt refresh my page
Stuck at electra #6 (last from the lethal wing), tried several ways, I’m always 3 damage away
just did it! use the coin and backstep on your mana addict, then use one razor petal on the drake, and the 4 dmg spell to finish it. use the 2 coins u get and use shadow strike on the enemy hero and the remaining razor petal also on the enemy hero => lethal
Ohh yeah, totally forgot about using the strike on the hero. Good find 🙂
Me too. I can get her to 2 health but thats it. Is the health really supposed to be 30? I cant fina any other way to do more than 28 damage
Don’t use wanted
Forgot the attack spud m.e. with stampeding kodo part of Electra #1 after playing drake
Confirmed
Does anyone know how to do Electra 5/6? Im having trouble with it, getting 3 damage off lethal each time
Nevermind, just got it.
How, can you expain?
Yeah pls tell me how
Ok faceless the rhyno then use the 1 mana 2-3 and the 2 mana 3-2 to kill the abomination, summon the 1 mana 1-1 and go face
Oh god i feel soo stupid now. Thank you
Ran into a bug with PUZZLE #8 – FULL DRAW. For some insane reason he is full health making him impossible to kill with the cards given.
1. cube on clockwork automation
2. play dead on cube
3. hunter’s mark and arcane shot on cube
4. hero power (32 dmg)
thank, man
What?????? Explain? He has 30 health now ?!
Thank you!
Does anyone know how to do stormy c’thun puzzle? I keep getting 1 damage off lethal
I just posted a solution in this article!
Thank you! I wasnt playing beckoner first so I was missing the +1 from healing it
I’m 3 off and I have followed your solution to the letter and despite repeated attempts I can’t get better than 3 off.
I see what I was doing wrong.
Stuck at stormy 5
Nvm got it
how im stuck haha
Puzzle #8, the boss has 30 health on my screen but only 9 on yours. help?
It has to be some sort of bug, I don’t know what happened. It should definitely be at 9.
thank you
For the full draw one my opponents health isnt the same as the picture in the guide and when i restarted to try and fix it it became 30 health
same thing happened to me
same issue, but mine has 11 health
I restarded but now he has 30 hp, help
Swear the last lethal for Lil’ Stormy is impossible? Am definitely missing something but can only deal 7 damage to the hydra, resulting in 21 face damage. Hitting face with weapon only deals another 2 and can’t find the final 2 damage anywhere 🙁
Nvm damage can go negative
Am I the only one who thinks Lil’Stormy lvl 6 is impossible to do ?
I agree!
Nevermind, already did it XD
You need to go double pyromancer, then commanding shout, then attack with your hero then coin into whirlwind
But the hero has 25 hp, and 7×3 is 21, plus the two from weapon is 23…
???
Hm, swear to god it didnt go negative before now..
Double pyro did it with ww last (for the ones wondering). It has to be at 2 hp when you use ww with double pyro down.
hit face with your weapon
gg, didnt think the hydra could go down to -1 🙂
I’m stuck at #6 of Myra in the lethal wing
Nvm, just solved it
lol same im stuck too
Ive got it: Rampage on Gromm->kill abomination with axe-> execute Lord of the Arena-> cleave-> Face
how did u do it?
the hydra one
Double pyro, commanding shout, coin, Attack face with hero, whirlwind. Damage will go to negative and deal 3 extra damage 🙂
yes thanks got it!! <3