The Binding of Nubby

Play the real Nubby’s Number Factory with 17 standard, non-Tainted Isaac characters, each with a different factory boost and attack rhythm. Normal Nubby supervisors remain available.

Build a run from 47 passive items, their upgrades, 16 foods with upgraded versions, and 17 active perks. Combine tears, homing, piercing, ricochets, Brimstone, full-board Technology lasers and returning Mom’s Knife attacks. Peg copying, doubling and conditional score bonuses work through Nubby’s own scoring rules.

Drag shop offers into the slot you want, merge matching items to upgrade, freeze stock for later and confirm sales with the shown price. Isaac rewards join the native shops, perk chests and Grab-a-Tron; food restores launches or grants temporary buffs. A factory launch counter, hover descriptions, Mind’s Eye information and an in-game handbook explain your build.

Single player. Requires your own Nubby’s Number Factory and The Binding of Isaac: Rebirth with Repentance+. Tested target: Nubby’s 1.4.7.5 (Steam build 25109973), Isaac Steam build 22878971, Windows x64. Isaac supplies its actual artwork from your installed copy and does not run alongside Nubby’s. Uses a separate save profile. No Isaac rooms, enemies, Tainted characters or multiplayer are included.

Original design by this mashup’s creator; implementation with OpenAI Codex. Original mod code and data are MIT licensed; remixes are allowed. Nubby’s Number Factory by MogDogBlog Productions; The Binding of Isaac: Rebirth by Nicalis and Edmund McMillen. Game content remains owned by its creators and is read from each player’s own games.

Includes UndertaleModTool/UndertaleModLib 0.9.2.0 by UnderminersTeam and contributors (GPL-3.0), Underanalyzer (MPL-2.0), their corresponding source archives, and dependency/runtime notices.

License

MIT (original mod code and data only; bundled dependencies retain their own licenses)