"Sprunki Mustard" refers to a fan-made mod titled "If Sprunki Were in Mustard" or sometimes called "Sprunkstard." Incredibox is a popular music-making game where users create beats and melodies by dragging and dropping animated characters that represent different sounds—beats, melodies, effects, and voices. The "Sprunki Mustard" mod takes this concept and reimagines it with a quirky, mustard-themed twist. In this mod, the original Sprunki characters (from a horror-inspired Incredibox mod called "Sprunki") are transformed by a fictional "mustard substance." This gives them a distinctive mustard-yellow aesthetic and alters their designs, often with an eerie, chaotic, or humorous vibe. Each character still corresponds to a unique sound—think glitchy beats, distorted melodies, or odd vocal effects—but they’re styled to fit the mustard theme, sometimes with dripping or melting visuals to enhance the surreal feel. Gameplay remains similar to standard Incredibox: you mix and match these mustard-infused characters to compose tracks, unlocking special animations or sound combos as you go. The mod stands out for its creativity, blending the original Sprunki’s dark undertones with a playful, almost absurd mustard motif. It’s a niche but popular creation within the Incredibox community, appealing to fans who enjoy experimental mods and quirky sound design.