BossRush

v1.1.3·Updated 2024-05-30

Adds a Boss Rush gamemode

Screenshots 2 screenshots

About this mod Author’s original text

Boss Rush

Adds a new Boss Rush gamemode.

Fight every boss level in sequence, then do it again but harder.

Each lap increases difficulty using radiance, which can be tuned in the mod config.

Hardcore Mode

Hardcore mode will restart you back to the very beginning if you die, so be careful.

Changelog

1.1.3

  • fixed a bug that caused the Boss Rush button to not work
  • added levels 5-2, 7-1, and 7-4
  • moved stat records to config folder
  • removed HydraDynamics dependency
  • reworked level chain system to now read the level route from a customizable json file

1.1.2

  • Fixed version display issue

1.1.1

  • Fixed hardcore mode softlock when no scores exist

1.1.0

  • Added endscreen when dying on hardcore
  • Added Discord RPC support
  • Hardcore mode can now be played on any difficulty
  • Added Highscores
  • Highscores will track on a completed lap
  • Added author links and version checking

Rush Stats

You can now customize the level route in the mod's files. ULTRAKILL/BepInEx/config/BossRush/LevelChain.json

LevelFrom - is the level the player is leaving

LevelTo - the level the player will enter after going into the final pit

PitTargetFilter - ("" for no filter) will filter the pit target in cases like 6-2 where the player could possibly enter the pit for P-2. In this specific example the filter would be "Intermission2" since you enter the 2nd intermission after being Gabriel 2

The very first LevelChain LevelFrom field in the file will be considered the first level and Boss Rush will load it when you enter Boss Rush mode. To establish a loop make sure the last LevelTo is matching the first LevelFrom field.

if your LevelChain.json file becomes corrupt it will be re-written by BossRush to the default chain.

If you're feeling generous;)

Installation

  • Download and install BepinEx, Tutorial here
  • Place BossRush.dll into BepinEx/plugins
  • Enjoy!

Install & use Install: BepInEx plugin

  1. The archive from playbuff is the mod itself — usually a BepInEx plugin (a .dll or a plugin folder once unzipped).
  2. Recommended: use a community mod manager (such as r2modman) — pick this game, import the mod, and the manager sets up BepInEx and its dependencies for you.
  3. Manual route: install the BepInEx loader in the game folder, then drop the unzipped .dll or plugin folder into BepInEx/plugins/.
  4. Launch the game — the BepInEx console logs every plugin it loads; seeing this mod in the log means it is installed.

Mods with listed dependencies need those installed too, or they will not load. Options are usually changed in-game or in the plugin's config file.

Dependencies

Install these first, or the mod will not work:

BepInEx-BepInExPack

File & checksum

Filename
BossRush-1.1.3.zip
File size
274.7 KiB
SHA-256
c7fbe3db4542b5054208e0c282401ca7a258ab6af720bbb7072918e7ed7ff815
Stored at
2026-10-06 19:20