IMPORTANT NOTE: It's highly recommended to unlock some of the high tier guns with your earned Hegemony Credits before dealing with this quest. Because you'll need a lot of cash to beat this challenge the way I do. Oh, by the way:

REMEMBER: This is probably not the ideal way. This guide is made with my personal experience and impressions on this game. If you think this'll not work with you, please look onto other methods online.

Step one: Release Bowler and Sorceress from their jails and have them appear on your upper right side of your Gungeon Main Hub. Both will only appear after defeating High Dragun atleast once.

Step two: Complete Sorceress' quest (Trust me, it's way easier than Daisuke's) and unlock the weapon Gunther.

Step three: Unlock character "The Bullet" (that caped guy with a sword). You'll see a red caped bullet kin randomly appearing on your journey. Clear the room without killing them and wait for them to despawn 5 times in order to unlock him. (You have to complete at least one character's past in order to make them spawn)

Step four: Grind a LOT of Hegemony Credits a.k.a this game's cash and pray for the RNG gods.

Step one: Pick The Bullet. Even though Marine's and Robot's better accuracy, Convict's rage, Pilot's cheaper shops could help you a lot in this challenge, Bullet's Live Ammo passive is a big, I mean a BIG plus on this run. Check the "Modifiers Tier List" section of this guide for the extended information.

Step two: Activate Challenge Run and Rainbow Run by talking to Bowler and Daisuke.

Step three: Begin the run and open your rainbow chest. Hope there will be a Gunther in there. If not, repeat until you are broke and go grind some more.

Step four: Clear rooms, grind shells, spend shells at shop on shields and blanks. Enter the boss room and use your blanks on right times and beat the boss without a scratch for an additional health bar.

• Floor 1: Keep of the Lead Lord
  
  Clear rooms, grind shells, spend shells at shop on armors and blanks. Enter the
  boss room and use your blanks on the right times and beat the boss without a scratch for an
  additional health bar. If failed, don't worry too much about it. The only weapon you'll need will be
  Gunther so you'll have plenty of chance to obtain passive items such as health upgrades.
  
  Unlock the secret floor by rolling a water barrel on top of a fireplace which is under a
  portrait of a wizard to reveal the trapdoor room. Use your 2 keys that you didn't needed to spend
  because of Rainbow Run and proceed to the secret floor.

• Secret Floor: Oubliette
  
  Open your second rainbow chest. Only take passive and active items, after all you only need Gunther as a gun. (Except maybe Composite Gun and/or Fightsabre) Grind shells and spend on armors and blanks as said above. You don't have to no-hit this floor's boss since it'll not give you an extra health bar as a reward, still be cautious on your health pool since you'll be needing a lot on the latter floors.
  
  Although I do not recommend you to go into Abbey of the True Gun, the second secret floor, you can still pick up the Old Crest for additional protection. Because of it's increased difficulty and being unable to achieve number of loots inside there because of Rainbow Run, going through to second secret floor feels rather not worthy.

• Floor 2: Gungeon Proper and Floor 3: Black Powder Mine
  
  
  Repeat everything as said above, but be extra cautious because there will be 2 modifiers for each room on these floors.
  
  After clearing Gungeon Proper, it is recommended to buy the Gnawed Key and heading to the Resourceful Rat's Lair on Black Powder Mine for an extra rainbow chest. You can just skip to the fourth floor, Hollow, after that.

• Floor 4: Hollow
  
  
  This is the moment of time that will prove how good you've prepared for this run. Three modifiers, buffed bosses, difficulty at maximum. I can't recommend for you to explore every room on this floor because of the high chances of you getting hit by a janky layout combined with jankier modifiers. Try your best at finding the shop and the boss room and ignore the rest.

• Final Floor: Forge
  
  
  Pick your last rainbow chest loot. Have as much as armor and blank as possible, head to the High Dragun. High Dragun fight will always start with the modifiers "Dragun Rage" and "High Stress". Blanks are the life savers in this fight. Use them sufficiently at right angles. If failed and got hit, start stress rolling. I'm not kidding, as long as you don't fall into the pit, you'll most likely dodge Dragun's most attacks. After the High Stress debuff is over, keep shooting. You are not allowed to take damage at the final phase, just stay calm and roll carefully. Good luck.

• Gull's Revenge: Gatling Gull's rockets constantly aim at you until you clear the room. Buckle your pants because this will probably cause you to take a lot of damage throughout the run not only because of the explosion, but because rolling into something stupid while trying to dodge the bullets. Really annoying modifier overall and requires some good focus and skills to deal with.
  
  
• Hammer Time: Mostly same as Gatling Gull's Revenge, but with a twist. The Hammer will also shoot bullets at every direction after landing to floor which means, yep, more rolling.
  
  
• Pot Shots: As known as the run killer. Broken pots will shoot bullets at you. You will never expect them to shoot at you. You will not be able to see them shooting at you in time. They are everywhere, and they will find the right moment to hurt you.

• Shockwave: A ring of electricty starts covering the entire room. Needs to be dodged, and will narrow your movement in the room.
  
  
• Thermal Clips: Makes a pool of fire similar to a molotov cocktail upon reloading. Fire is bad, fire is scary, fire requires rolling, which will get you in a vulnerable situation.
  
  
• Blobulin Rancher (without The Bullet as gungeoneer): Spawns a blobulin after a missed shot. Sounds not too bad, after dealing with the early floors. Latter floors are covered with traps, pits and tanky enemies. This will cause them to corner you and deal cheap hits to you by touching you or making you roll to a bad angle.

• Gorgun's Gaze: Random eyes appear on the room, spewing waves that petrify the player upon staring at them directly. Requires rolling or looking away. Can be dealt with, but will be a obstacle from here and there.
  
  
• Rat's Revenge: Rooms that has this modifier will be filled with fire traps, which will narrow your movement.
  
  
• Don't Blink: Rooms that has this modifier will cover the room in darkness and gives you a cone of light such as like a flashlight. Looking at the enemies with this cone of light will stun them, but enemies that are in the darkness will turn jammed and get faster. Combined with some enemies such as Blobulins or mummies that run into you makes rooms much more threatening.

• Ghost of the Shell: Killed enemies has a chance to spawn a Hollowpoint as know as AK-47 Ghosts. Can make rooms a bit harder on earlier floors, but mostly not a big deal if you have a weapon that packs a punch.
  
  
• Poison Pursuit: A line of poison will follow you until you clear the room. Poison is not so scary, and the pool might help you take down grounded enemies.
  
  
• Explosive Pyres Makes every enemy explode after dealing the finishing blow to them. Crowded enemies such as bats and bullet kins can make this scary, but the explosion also hurts the enemies, which makes some rooms faster to clear.
  
  
• Final Attack: Killed enemies will spew out a circle of bullets. Similar to Explosive Pyres, crowded rooms can cause this to be harder to deal with. Other than that, deal-able.

• Cursed Ceramics: Room that has this modifier will be covered with cursed pots, which will add 1 curse to you if stood in its effective area for too long. Can be broken, not too punishing, not scary at all.
  
  
• Zone Control: Spawns crates on the room, forces you to stand near those crates to be able to shoot your gun. Can narrow your movement, but the crates will go off after standing at their circle a few seconds after.
  
  
• Long Live the King: An enemy will be crowned. That crowned enemy must be killed to be able to deal damage to other enemies in the room. This modifier can make things trickier on larger rooms since finding the enemy will be a difficulty. Also crowded rooms because enemies surrounding the crowned will act as a meat shield.
  
  
• Unfriendly Fire: Your bullets that hit the walls will ricochet back at you at slower pace. They will most likely not get the chance to hit you, but can caught you off guard if not careful
  
  
• Last Bullet Standing: Randomly chosen enemy will be invulnerable until you clear the room. This will mostly not effect you at all as long as the chosen enemy is not a buffer.
  
  
• Gun Queue: Switches your weapons upon reload. This is a real annoying modifier to deal with normally especially with 1 ammo guns such as bows, but it won't be a big matter with my strategy since the number of guns you'll be getting are really short.

• Blobulin Rancher (with The Bullet as the gungeoneer): Blobulins spawning will mean nothing to you since you take no contact damage, they will just bump at you and die. How miserable.

Gungeoneer: The Bullet

Guns: Blasphemy (starter), Gunther
Recommendations: Composite Gun, Vulcan Cannon, Fightsabre, Robot's Left Hand, Starpew, Sunlight Jawelin

Active Items: Relodstone
Recommendations: Knifeshield, Ticket, Aged Bell

Passive Items: Live Ammo (starter)
Recommendations: Platinum Bullets, Yellow Chamber, Armor Synthesizer, Shock Rounds and any stat upgrade like Broccoli and Magic Sweet

Hope this guide helps any of you out there on clearing this challenge. If not, sorry for making you read a bunch of paragraphs with no positive results. As I've said, this is purely from my perspective, I'm sure there are a ton of ways to deal with this challenge, maybe even easier ways. There are many players out there that are really good at video games, including you! So find out your way to deal with this one if my tips are not fit for your shoes. If it did help, I'm glad I could support you on your journey. Thank you for reading.


Sincerely, a player who has some free time to create a guide for community.