Professor Goopton

Professor Goopton is a merchant NPC in Enter the Gungeon and Exit the Gungeon. All dialogue spoken by Goopton is rendered in an alternative font called Gleepglorpenese internally, which makes him extremely difficult to understand. Functionally, however, Gleepglorpenese is just a basic substitution cipher.

Function

Professor Goopton runs a small shop within The Gungeon, offering passing Gungeoneers a variety of goop and slime themed items and guns in exchange for .

Enter the Gungeon

Items in Gooptons Gungeon shop are all offered at 80% price, giving a 20% discount over regular shop prices. While Goopton is difficult to understand, his dialogue is reverted back into the default Enter the Gungeon font whenever the player has the Sponge, allowing them to understand him.

After purchasing an item from his shop in the Gungeon, Professor Goopton will also move into the upper right area of The Breach where he operates another shop, offering goop and slime themed item and gun unlocks in exchange for .
A total of 146 is required to purchase everything from this shop.

Click 'Expand' on the below tables to view Professor Gooptons item pools

Guns and Items Sold In The Gungeon
Icon	Name	Quality	Type	Effect
	Abyssal Tentacle "Look Away"		Gun (Beam)	Fires a tentacle that homes in on and grips enemies, damaging them.
	Barrel "Nothin' Easier"		Gun (Semiautomatic)	Fires fish that have a chance to stun enemies and leave pools of water.
	Bubble Blaster "The Suds"		Gun (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"		Gun (Charged)	Fires sharks that swim around the room, seeking enemies and biting them.
	Fossilized Gun "Proof That Guns Once Existed"		Gun (Beam)	Fires a stream of oil. Reloading causes the skull to spit fire, which can ignite the oil.
	Gungeon Ant "What Army?"		Gun (Semiautomatic)	Reloading alternates between firing spreads of bullets that leave behind oil and flaming bullets.
	Mega Douser "Contents Under Pressure"		Gun (Beam)	Fires a stream of water.
	Mutation "Didn't Need Two Anyway"		Gun (Beam)	Fires a continuous beam and heavily pushes back the player.
	Plague Pistol "Chemical Warfare"		Gun (Semiautomatic)	Fires bullets that leave poison goop on the ground and have a chance to poison enemies.
	Plunger "Take Your Best Shot!"		Gun (Beam)	Fires a stream of poison. Has a chance to Poison enemies and leaves poisonous puddles on the floor.
	Strafe Gun "Bleeding Edge Gameplay"		Gun (Automatic)	Fires nails that explode upon releasing the trigger.
	The Membrane "Green Or Yellow?"		Gun (Semiautomatic)	Fires a shotgun blast of bouncing green bullets that split into more bouncing green bullets.
	Evolver "Tamagunchi"		Gun (Semiautomatic)	Killing enemies evolves the gun through 6 forms.
	Bottle "Heart Container"		Active	Upon use, stores an extra heart or ammo pickup.
	Bug Boots "Yikes!"		Passive	Dodge rolling leaves a trail of poison creep. Makes the player immune to poison.
	Duct Tape "Friend Of Gunsmiths"		Active	Single use. Combines 2 guns by granting one gun the projectiles that the other gun fires.
	Gundromeda Strain "All Enemies Weaker!"		Passive	Decreases health of all enemies encountered.
	Monster Blood "Twist To Open"		Passive	Taking damage spawns a pool of poison creep. Grants immunity to poison creep and a heart container.
	Napalm Strike "Smells Great!"		Active	Sets a large rectangular area on fire.
	Poison Vial "For External Use Only"		Active	Creates a pool of poison creep.
	Potion of Gun Friendship "Temporary +1 To Gun"		Active	While active, increases all gun stats.
	Potion of Lead Skin "I'm Invincible!"		Active	While active, the player reflects enemy bullets without taking damage.
	Sponge "Godliness"		Passive	Removes all liquids near the player. Also allows the player to understand Professor Goopton's speech.
	Weird Egg "Miracle of Gun"		Active	Fully heals the player on use. Dropping the egg and shooting it spawns a gun, item, or yolk creature. Dropping the egg into fire spawns a serpent.

Gun and Item Unlocks Sold In The Breach
Icon	Name	Quality	Type	Effect	Cost
	Plague Pistol "Chemical Warfare"		Gun (Semiautomatic)	Fires bullets that leave poison goop on the ground and have a chance to poison enemies.	6
	Plunger "Take Your Best Shot!"		Gun (Beam)	Fires a stream of poison. Has a chance to Poison enemies and leaves poisonous puddles on the floor.	7
	The Membrane "Green Or Yellow?"		Gun (Semiautomatic)	Fires a shotgun blast of bouncing green bullets that split into more bouncing green bullets.	10
	Fossilized Gun "Proof That Guns Once Existed"		Gun (Beam)	Fires a stream of oil. Reloading causes the skull to spit fire, which can ignite the oil.	12
	Abyssal Tentacle "Look Away"		Gun (Beam)	Fires a tentacle that homes in on and grips enemies, damaging them.	15
	Evolver "Tamagunchi"		Gun (Semiautomatic)	Killing enemies evolves the gun through 6 forms.	35
	Monster Blood "Twist To Open"		Passive	Taking damage spawns a pool of poison creep. Grants immunity to poison creep and a heart container.	5
	Bug Boots "Yikes!"		Passive	Dodge rolling leaves a trail of poison creep. Makes the player immune to poison.	7
	Sponge "Godliness"		Passive	Removes all liquids near the player. Also allows the player to understand Professor Goopton's speech.	6
	Napalm Strike "Smells Great!"		Active	Sets a large rectangular area on fire.	18
	Gundromeda Strain "All Enemies Weaker!"		Passive	Decreases health of all enemies encountered.	25

Exit the Gungeon

Once rescued from a cell using a purchased Rat Key, Goopton will appear at random in NPC rooms in the main shop, operating his own storefront of goo themed items at a 33.333...% discount. Professor Gooptons dialogue is still displayed in Gleepglorpenese in Exit the Gungeon, however the lack of the Sponge item in Exit the Gungeon means that the only option availiable to players who wish to understand his dialogue is manual deciphering or datamining.

Quest

After speaking to Professor Goopton a certain number of times, he will request that the player retrieve him Salt. Salt is a quest item, and can be obtained from snatching it out from under Resourceful Rat shaped balloons in Just Deserts Golf and Winchesters Original Game.
Delivering the Salt to Goopton will result in his children being absent on subsequent runs, replaced by ominous blood spatter on the walls and floor of the room.

Associated Items

Item	Relevant Text	Notes
Potion of Lead Skin ETG	"A product of Professor Goopton's rigorous research. "	None
Potion of Gun Friendship ETG	"Another of Goopton's inventions. The Potion of Gun Friendship will temporarily strengthen one's bond with their weapon, increasing combat prowess significantly."	None

Cut Content

• An IGN pre-release teaser for Enter the Gungeon shows Goopton in a different position in the Breach to where he normally appears, during a shot intended to illustrate the population of the Breach over time. Whether this means that Goopton initially appeared near the entrance of the Breach during pre-release versions of Enter the Gungeon, or if he was simply placed there to fill space is unknown.
• In pre-release versions of Enter the Gungeon, Gooptons shop room had a different, rectangular layout. Additionally in these versions, he can be seen selling an item called Secret of the Ooze, which may have been an early iteration of Bug Boots

Notes

• The characters and substitution cipher of Gleepglorpenese are taken directly from Alienese, a substitution cipher from Futurama.
• Professor Goopton is one of the few NPCs who will talk to the Cultist^ETG.

Gallery

• 

  Goopton appearing in a Shop Annex
• 

  Goopton in the Breach in early IGN previews, positioned unusually to the right of the entrance
• 

  Gooptons shop in pre-release versions of Enter the Gungeon

See also

• NPCs
• Merchants