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Sprunki Incredibox: Simon & Gray Castle — Overview, Gameplay, Audio Profile & Character Breakdown
What Is Simon & Gray Castle?
Sprunki Incredibox: Simon & Gray Castle is a fan-made narrative mod within the Sprunki universe — itself a wildly popular community mod built on top of the music-mixing game Incredibox (originally by French studio So Far So Good). This particular variant centers its entire creative identity around Simon and Gray, the two characters widely recognized as the dual protagonists of the Sprunki franchise: Simon as the Normal Mode protagonist and Gray as the Horror Mode protagonist.
The "Castle" concept reimagines the standard Sprunki stage as a medieval fortress setting, with Simon and Gray positioned as rival rulers — one governing the sunlit kingdom of harmony, the other presiding over the crumbling towers of the horror realm. The mod layers a dual-realm narrative onto the familiar drag-and-drop music engine: the left side of the stage represents Simon's domain (bright, melodic, orderly), while the right side embodies Gray's territory (dark, bass-heavy, tense). Placing characters across the boundary between the two zones triggers unique cross-realm interaction animations — a mechanic absent from the base Sprunki mod.
What makes this variant scarce and hard to replicate is its dual-protagonist structural design: rather than treating all 20 characters as equal contributors, it assigns each character a faction allegiance (Simon's Court vs. Gray's Court), and the musical output shifts dynamically depending on which faction dominates the stage.
How to Play
Core Mechanics (Inherited from Sprunki/Incredibox)
Drag & Drop Activation: The stage displays grey silhouette slots. Character icons sit at the bottom of the screen. Drag any icon onto a slot to activate that character — they immediately begin playing their assigned looping sound layer.
One-to-One Mapping: Each icon can only occupy one slot. Each slot can only hold one character. This enforces deliberate compositional choices.
Mix Controls: Click any active character to mute, solo, or remove them from the stage, giving you real-time control over the layered mix.
Record & Export: The mod supports recording up to approximately 3 minutes of your composition, capturing all activation, mute, and solo actions in sequence.
Castle-Specific Mechanics
Faction Placement: Characters are divided into Simon's Court (warm-toned characters: Oren, Pinki, Mr. Sun, Durple, Simon, Tunner, Sky, Vineria, Mr. Tree, Fun Bot) and Gray's Court (cool/dark-toned characters: Gray, Wenda, Jevin, Black, Raddy, Clukr, Brud, Garnold, OWAKCX, Mr. Fun Computer). Placing a majority of one faction shifts the stage's visual atmosphere and background music toward that faction's aesthetic.
Border Clash Event: When characters from opposing factions occupy adjacent slots, a brief tension animation plays — sparks fly between them, and a short dissonant audio sting overlays the mix. This is purely cosmetic and does not disrupt the music.
Castle Throne Bonus: Filling all 7 slots with characters from a single faction triggers the Throne Cutscene — Simon's Court produces a triumphant golden light burst; Gray's Court summons a blood-red lightning storm. Each cutscene unlocks a unique bonus audio loop that can then be used in future compositions.
Horror Transition: Dragging the Black icon (20th character) onto any active slot triggers the full Horror Mode transformation — sky darkens, all character sprites morph into their damaged/corrupted forms, and the audio shifts to distorted variants. Gray's Court characters are largely unaffected visually (they are already "dark-aligned"), while Simon's Court characters undergo dramatic visual degradation.
Musical Attributes
The mod retains the standard Sprunki audio architecture of 20 characters across 4 sound categories, but the Castle variant adds faction-based harmonic filtering — certain character combinations produce enhanced harmonics when placed within their native faction zone.
Beats (Rhythm Foundation)
| Character | Sound Type | Audio Character |
|---|---|---|
| Oren | Kick drum (low) | Deep, punchy bass drum — rhythmic backbone |
| Raddy | Snare drum | Sharp, rapid snare with aggressive attack |
| Clukr | Cymbal/Crash | Bright metallic crash and hi-hat patterns |
| Fun Bot | Drum solo | Complex percussive fills with emotional dynamics |
| Vineria | Maracas/Shaker | Warm, organic shaker texture |
Effects (Texture & Atmosphere)
| Character | Sound Type | Audio Character |
|---|---|---|
| Gray | Sub-bass pulse | Low-frequency rumble resembling a phone vibration — the mod's signature atmospheric layer |
| Brud | Chiptune/8-bit | Lo-fi glitch blips and digital artifacts |
| Garnold | Synth pluck | Mechanical, metallic plucked synth tones |
| OWAKCX | Ride cymbal | Sustained shimmering cymbal washes |
| Sky | Music box | Delicate, high-pitched arpeggios — the youngest character's voice |
Melodies (Harmonic Layer)
| Character | Sound Type | Audio Character |
|---|---|---|
| Mr. Sun | Piano | Warm, bright piano chords |
| Durple | Trumpet/Horn | Bold brass stabs and sustained horn lines |
| Mr. Tree | Pipe organ | Deep, resonant organ tones with slow attack |
| Simon | 8-bit synth | Retro chiptune melody lines — the protagonist's signature sound |
| Tunner | Whistle | Clean, piercing whistle melody |
Voices (Vocal Layer)
| Character | Sound Type | Audio Character |
|---|---|---|
| Mr. Fun Computer | Vocal synth | Cheerful spoken-word phrases; in Horror Mode, plays a distorted warning song |
| Wenda | Vocal loop | Repeated "Hey" with hollow, cat-like undertones |
| Pinki | Female choir | Layered ethereal female vocal harmonies |
| Jevin | Male choir | Deep male choral chanting — mysterious, cult-like tone |
| Black | Silence → Distortion | Silent in Normal Mode; triggers full horror atmosphere when activated |
Castle-Specific Audio Note: When Simon and Gray are placed in adjacent slots, their audio loops synchronize into a unique dual-protagonist harmony — Simon's bright 8-bit melody weaves through Gray's dark sub-bass pulse, creating a tension-resolution dynamic that is the mod's signature sound. This interaction is exclusive to the Castle variant.
Character Profiles
Simon — The Normal Mode Protagonist
Visual: Yellow male figure with two straight antennae, triangular side "horns," and a tuft of curly hair on top. Cheerful expression.
Voice: 8-bit synth melody lines.
Personality: Kind, confident, one of the fastest runners in the Sprunki world (tied with Raddy). Poor eyesight — wears round glasses when reading. Loves chocolate. Frequently plays games with Oren, Garnold, and Clukr. Forms the "Golden Triangle" friendship group with Oren and Durple.
Horror Mode: Eyes sewn shut, mouth stretched into a grotesque grin with elongated teeth. Completely loses sanity — bites Brud, removing a quarter of his head. Despite this, he physically survives.
Castle Role: Leader of Simon's Court. His presence on the stage tilts the visual atmosphere toward warm golden tones.
Gray — The Horror Mode Protagonist
Visual: Grey-skinned mysterious creature resembling a cat (officially classified as an "unknown species," not a cat). Features slightly darker cat ears, black eye shadow, ring-shaped pupils, a straight-line mouth, and six black freckles (three per cheek). Default expression: bored or fatigued.
Voice: Low, rumbling sub-bass pulse — often described as resembling a phone vibration. He is the first Effects-type character in the Sprunki roster and the only character named after a color.
Personality: Calm, introverted, gentle, and composed. Rarely smiles. Despite his passive exterior, he possesses hidden resilience — in Horror Mode, he is one of the few characters who survives without physical corruption, though his ears droop and his expression shifts to wide-eyed alertness.
Relationships: Officially confirmed as friends with Wenda (not romantic). Shares a sibling-like bond with Pinki (he is her adoptive brother figure). Fights alongside Jevin in Horror Mode. Loyal companion to Fun Bot. The author has explicitly called Gray the "Horror Mode protagonist" in contrast to Simon's Normal Mode role.
Castle Role: Sovereign of Gray's Court. His presence shifts the stage atmosphere toward dark, muted tones with subtle red undertones.
Supporting Cast (Faction Assignments)
Simon's Court (Light Faction)
| Character | Role | Key Trait |
|---|---|---|
| Oren | Rhythm anchor | Orange alien DJ; official couple with Pinki; Horror Mode: chest cavity exposed, heart beating |
| Pinki | Vocal lead | Pink rabbit; kind, loves jumping; Horror Mode: face torn off by Wenda but survives |
| Mr. Sun | Harmonic warmth | Smiling sun entity; extremely long-lived; can accidentally burn others when excited |
| Durple | Brass power | Purple flightless dragon; calm and collected; collects trumpets |
| Tunner | Melodic whistle | Khaki sheriff with revolver; upright and protective; Horror Mode: shot by Wenda |
| Sky | Delicate texture | Light blue bear-eared youth, age 14; youngest character; collects teddy bears; Horror Mode: impaled by steel pipe |
| Vineria | Organic percussion | Green figure with vine-like hair (actually a wig); plant lover; Horror Mode: vines erupt from skull |
| Fun Bot | Dynamic fills | Robot built by Clukr and Garnold; capable of emotion; Horror Mode: mentally damaged but physically intact |
| Mr. Tree | Deep resonance | Sentient tree, 50+ years old; Horror Mode: frozen still, face replaced by a missing-person poster |
| Simon | Protagonist | (See above) |
Gray's Court (Dark Faction)
| Character | Role | Key Trait |
|---|---|---|
| Gray | Protagonist | (See above) |
| Wenda | Vocal loop | White cat-eared figure; calm and rational in Normal Mode; carries a knife; Horror Mode: goes feral, attacks multiple characters; saved Gray from Black's curse but was cursed herself in the process |
| Jevin | Choral depth | Deep blue hooded figure; cult member but fundamentally kind; knows hidden secrets; one of the oldest characters; Horror Mode: largely unscathed, voice deepens |
| Black | Horror trigger | Mysterious top-hat figure; catalyst of the entire Horror event; believed to have been driven mad after Clukr and others destroyed his instrument; voice: silence in Normal Mode, distorted atmosphere in Horror Mode |
| Raddy | Aggressive rhythm | Red figure with five dark horns; perpetually angry; fastest runner (tied with Simon); Horror Mode: face destroyed, body halved — the most visually devastating death |
| Clukr | Metallic crash | Silver inventor with cymbal-head; co-creator of Fun Bot and Mr. Fun Computer; intellectual backbone of the cast; Horror Mode: half his skull crushed |
| Brud | Glitch texture | Brown figure with iron bucket on head; very low intelligence; Horror Mode: head partially bitten off by Simon, but survives due to minimal brain mass and lack of pain perception |
| Garnold | Synth pluck | Gold figure in mechanical suit with face mask; inventor; Horror Mode: mask shattered,充血 eyes exposed |
| OWAKCX | Cymbal sustain | Lime-green figure with mismatched pupils; perpetually tense; rumored brain injury from Raddy; Horror Mode: lower face removed, becomes more energetic |
| Mr. Fun Computer | Vocal synth | Computer monitor wearing a hat; built by Clukr and Garnold; Horror Mode: screen displays a frantic warning message telling the viewer to run |
What Makes This Mod Distinct
Dual-protagonist architecture: No other Sprunki variant structurally organizes its gameplay around the Simon-vs-Gray narrative axis. The faction system transforms passive music-mixing into a territorial tug-of-war with audible and visual consequences.
Lore-integrated mechanics: The cross-realm border clash animation, the Throne Cutscene bonuses, and the Simon-Gray adjacency harmony are all mechanically tied to the established Sprunki canon — Simon as the Normal Mode hero, Gray as the Horror Mode survivor, and Black as the catastrophe that split their world.
Complete roster with faction mapping: All 20 characters are assigned to a court based on their canonical personality traits and narrative roles, creating a compositional layer that rewards deep familiarity with the Sprunki universe.
Free, browser-based, no installation required: Like all Sprunki variants, it runs directly in a web browser with no downloads, subscriptions, or in-app purchases.