This mod works with the Farewell to Arms update

Some new gamemodes to challenge the veteran gungeoneer!

Use: 
gamemode marathon - 100 rooms in a straight line, 3 shops, 4 chest rooms. Get ready for some long load times!
gamemode arena - A bunch of enemies all packed into 1 room.

Add the keyword super after either command to add the oubliette and abbey to the run.
Ex: "gamemode marathon super"

More money drops in both modes to offset the surplus/lack of rooms

RufusMckain, one of my favorite Twitch Streamers did a video series on this mod!

Installation
Get MTG:

• Download Mod the Gungeon at: http://modthegungeon.eu/#download
  
• Make sure Enter the Gungeon is closed
  
• Open ETGMod.Installer.exe and press "Step 3: Install ETGMod"
  
• Close dat thang
  

Installing mods:

• Go to your Enter the Gungeon Steam directory, usually located at:
  "C:\Program Files (x86)\Steam\steamapps\common\Enter the Gungeon\"
  
• If there is not one already, create a folder called "Mods"
  
• Drag ExtremeFloorLayouts.zip into the Mods folder
  
• If there is a "mods.txt" file in the Mods folder, delete it
  
• The directory should look like this:  "Enter The Gungeon/Mods/ExtremeFloorLayouts.zip
  

Then launch the game. If Mod the Gungeon installed correctly, you can press F1 to see the list of active mods. 

Open the console with ~ or / to enter commands.
Type help for a list of commands.