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BillionNemesis

by BillyMod

(Act 1 update) Adds alternate versions of levels with higher difficulty and more interesting enemy arenas

Latest version
3.2.0
Downloads
17.8k
Rating
17
Filed under
Mods, Misc
Updated
2 mo ago
Available on
Thunderstore

Download

From BillionNemesis’s own host. Nothing is re-hosted here.

3.2.0release5 Jul 2026

BillyMod-BillionNemesis-3.2.0.zip · 0.7 MB

Older versions4
  • 3.1.14 Jul 20260.7 MBGet
  • 3.1.04 Jul 20260.7 MBGet
  • 3.0.13 Jul 20260.7 MBGet
  • 3.0.03 Jul 20260.7 MBGet

Frequently asked

How do I install BillionNemesis?

Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and ULTRAKILL all have to be on the same version, which is the usual reason a mod does not appear in game.

Where do I download BillionNemesis safely?

From the author's own page on Thunderstore, which is where the data here is synced from. IndexGG never mirrors, re-hosts or repackages a file: every download button points at the original source, so you get exactly what the author published.

Which ULTRAKILL versions does BillionNemesis work on?

The author has not declared a supported version in the metadata we sync, so there is nothing here we can state as fact. Check the project's own page before installing it, and treat an old mod with no declared version as untested on modern ULTRAKILL.

Dependencies

From release 3.2.0, the newest one. An older release may need different things.

Needs 3

Install these first or it will not load.

  • Hydraxous-Configgy(not indexed yet)
  • BepInEx-BepInExPack(not indexed yet)
  • BillyMod-SpawnerArmExtras(not indexed yet)

Last checked 2 mo ago against Thunderstore. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

Not indexed yet. Score 55 against a threshold of 55. The page still exists and is still linked; it simply carries noindex until we hold more.