Professor Goopton is an NPC that can be rescued from a cell in the Gungeon Proper or the Oubliette. After being rescued, he will set up shops in the Gungeon, where he will sell goop-themed items and guns with a x0.8 price discount. After purchasing something from his shop in the Gungeon, he will also move to The Breach, where new goop-themed items and guns can be unlocked with . A total of 146 is required to purchase everything.
Items sold in the Gungeon[edit | edit source]
|Abyssal Tentacle||Look Away||Beam||Fires a tentacle that homes in on and grips enemies, damaging them.|
|Barrel||Nothin' Easier||Semiautomatic||Fires fish that have a chance to stun enemies and leave pools of water.|
|Bubble Blaster||The Suds||Automatic||Fires bubbles which move slowly towards enemies. Reloading the gun launches bubbles away from the player at high speed.|
|Compressed Air Tank||You Know My Work||Charged||Fires sharks that swim around the room, seeking enemies and biting them.|
|Fossilized Gun||Proof That Guns Once Existed||Beam||Fires a stream of oil. Reloading causes the skull to spit fire, which can ignite the oil.|
|Gungeon Ant||What Army?||Semiautomatic||Reloading alternates between firing spreads of bullets that leave behind oil and flaming bullets.|
|Mega Douser||Contents Under Pressure||Beam||Fires a stream of water.|
|Mutation||Didn't Need Two Anyway||Beam||Fires a continuous beam and heavily pushes back the player.|
|Plague Pistol||Chemical Warfare||Semiautomatic||Fires bullets that leave poison goop on the ground and have a chance to poison enemies.|
|Plunger||Take Your Best Shot!||Beam||Fires a stream of poison. Has a chance to Poison enemies and leaves poisonous puddles on the floor.|
|Strafe Gun||Bleeding Edge Gameplay||Automatic||Fires nails that explode upon releasing the trigger.|
|The Membrane||Green Or Yellow?||Semiautomatic||Fires a shotgun blast of bouncing green bullets that split into more bouncing green bullets.|
|Bottle||Active||Heart Container||Upon use, stores an extra heart or ammo pickup.|
|Bug Boots||Passive||Yikes!||Dodge rolling leaves a trail of poison creep. Makes the player immune to poison.|
|Duct Tape||Active||Friend Of Gunsmiths||Single use. Combines 2 guns by granting one gun the projectiles that the other gun fires.|
|Gundromeda Strain||Passive||All Enemies Weaker!||Decreases health of all enemies encountered.|
|Monster Blood||Passive||Twist To Open||Taking damage spawns a pool of poison creep. Grants immunity to poison creep and a heart container.|
|Napalm Strike||Active||Smells Great!||Sets a large rectangular area on fire.|
|Poison Vial||Active||For External Use Only||Creates a pool of poison creep.|
|Potion of Gun Friendship||Active||Temporary +1 To Gun||While active, increases all gun stats.|
|Potion of Lead Skin||Active||I'm Invincible!||While active, the player reflects enemy bullets.|
|Sponge||Passive||Godliness||Removes all liquids near the player. Also allows the player to understand Professor Goopton's speech.|
|Weird Egg||Active||Miracle of Gun||Using the egg while missing health fully heals the player. Dropping the egg and shooting it spawns a gun, item, or yolk creature. Dropping the egg into fire spawns a serpent.|
Items sold in The Breach[edit | edit source]
|Plague Pistol||Chemical Warfare||Semiautomatic||12||200||Fires bullets that leave poison goop on the ground and have a chance to poison enemies.||6|
|Plunger||Take Your Best Shot!||Beam||500||500||Fires a stream of poison. Has a chance to Poison enemies and leaves poisonous puddles on the floor.||7|
|The Membrane||Green Or Yellow?||Semiautomatic||6||120||Fires a shotgun blast of bouncing green bullets that split into more bouncing green bullets.||10|
|Fossilized Gun||Proof That Guns Once Existed||Beam||500||500||Fires a stream of oil. Reloading causes the skull to spit fire, which can ignite the oil.||12|
|Abyssal Tentacle||Look Away||Beam||500||500||Fires a tentacle that homes in on and grips enemies, damaging them.||15|
|Evolver||Tamagunchi||Semiautomatic||Varies||Varies||Killing enemies evolves the gun through 6 forms.||35|
|Monster Blood||Passive||Twist To Open||Taking damage spawns a pool of poison creep. Grants immunity to poison creep and a heart container.||5|
|Bug Boots||Passive||Yikes!||Dodge rolling leaves a trail of poison creep. Makes the player immune to poison.||7|
|Sponge||Passive||Godliness||Removes all liquids near the player. Also allows the player to understand Professor Goopton's speech.||6|
|Napalm Strike||Active||Smells Great!||Sets a large rectangular area on fire.||18|
|Gundromeda Strain||Passive||All Enemies Weaker!||Decreases health of all enemies encountered.||25|
Quotes[edit | edit source]
After being rescued:
- "Thank you for rescuing me! My name is Professor Goopton. I came to the Gungeon to research the strange and mysterious goops that can be found here! I have long been a student of the Blobulonian Empire's technology. I followed them here, years ago, to see how their martial strategies would evolve in the Gungeon."
After leaving the cell:
- "Thank you again. Hopefully, I will see you again soon!"
Entering his shop:
- "Welcome, welcome!"
- "Welcome! I have opened this small shop to continue my research."
- "All proceeds will go toward funding my research!"
Purchasing an item:
- "Thank you for your support!"
- "Ah, you certainly have an eye for the viscous!"
Talking to him:
- "What are those monstrosities coming out of your body?"
- "You are the ugliest thing I have ever seen."
- "Your lack of goop is concerning and disgusting."
- "Away with you."
Leaving his shop:
- "You son of a goop!"