PunchoutAnywhereMod - v 1.0 by Apache Thunder. Source Code to this mod: https://github.com/ApacheThunder/PunchoutAnywhereMod

Features:

• Ability to start the Rat Punchout fight anytime. Just type "playpunchout" to start it.
  A new custom floor layout will spawn on the floor you are on and will be teleported over to it.
  It has most of the stuff the original rat floor had minus the enemies/maze and boss fight. :D

Note that you should not attempt to run the command from the breach.

Compiling and versions of Enter the Gungeon required:

This source code uses C#. Visual Studio 2015 or newer recommended.
This mod is intended for post AG&D versions of Enter the Gungeon. Please ensure your game is up to date before attempting to use this mod.