Boo Who is a 3D Halloween ghost toy you steer around an endless candlelit floor. You drift a sheet ghost past carved jack-o-lanterns, walking skeletons and other ghosts, collecting glowing whispers as you go. There is no losing and no timer — it runs as long as you want to drift.

Can I save a picture or video of my ghost?

Yes. The Capture panel exports stills up to 8K as PNG, JPEG or WebP, short video clips, and animated GIFs. You can pick 16:9, 9:16, square or the current view, and it captures the room only — the controls never appear in the shot.

Does Boo Who work on a phone?

Yes. Drag to steer with one finger, and the settings open as a bottom sheet so the room stays visible while you change the ghost. It needs a browser with WebGL 2, which covers current versions of Chrome, Edge, Firefox and Safari.

What makes the music in Boo Who?

The score is composed in your browser as you play, from shifting organ harmonies, spectral melodies, distant bells and wind, so it never repeats the same way twice. Rain and wind are synthesized too. Only the thunder is a real field recording.

Boo Who

This haunting needs WebGL 2 to awaken. Try a current browser with hardware acceleration enabled.

Settings

Your ghost

SheetIvory

EyesWide eyed

Transparency Fullness Cloth looseness Drift speed

The haunting

FloorCreaking oak

Ghost population

Ghost mood

Thunderstorm

CandlelightTallow

CandelabrasScattered

Jack-o’-lanterns

Walking skeletons

RugsSome

WhispersFew

Moonlight Fog Camera distance

Rendering

The sound

Haunting soundtrack

Music volume Spectral effects

Capture

Stills, video and GIF

Donateone-time via PayPal Supportmonthly on Patreon

Boo Who is a tactile 3D ghost toy: drift forever across a candlelit floor, collect its wandering whispers, and jostle the other ghosts. Carved jack-o’-lanterns gather between the rugs while articulated skeletons amble through the room. Ghosts, skeletons, pumpkins, and candelabras share solid collisions.

More from Chris Pirillo

More of My Apps Follow Chris Pirillo Learn How to Make Apps

More haunted things

Scream Saver Candy Corn Smash Hallowattack Campfire Simulator

Controls

DragGuide your ghost across the floorWASDGlide in any directionArrowsGlide in any directionEscClose Settings or return from About

Sound

The endless score is composed in the browser from shifting organ harmonies, spectral melodies, distant bells, wind, and reactive chimes. A thunderstorm adds deeper darkness, clustered lightning, and real recorded thunder with distance and air absorption. Sound begins only after you turn it on or move the ghost.

Questions

Is Boo Who free to play?

Yes. No account, no sign-in, nothing to install. Your settings stay on this device.

How do you control the ghost?

Drag anywhere on the floor to guide the ghost toward your finger or cursor. On a keyboard, WASD and the arrow keys glide in any direction.

Can I save a picture or video?

Yes. Capture exports stills up to 8K as PNG, JPEG or WebP, short video clips, and animated GIFs, in 16:9, 9:16, square or the current view. It captures the room only, never the controls.

Does it work on a phone?

Yes. Drag to steer with one finger, and settings open as a bottom sheet so the room stays visible while you change the ghost.

What makes the music?

The score is composed in your browser as you play, so it never repeats the same way twice. Rain and wind are synthesized too. Only the thunder is a real field recording.

Why will nothing appear?

Boo Who needs WebGL 2 and hardware acceleration. If the room stays dark, check that acceleration is on in your browser settings, or try a different browser.

Privacy

Your preferences stay in this browser. Nothing you do in the haunting is uploaded.

Credits

Built for Pirillo Arcade with Three.js. Pumpkin shells, carvings, stems, placement, and walking motion are generated in the browser. Rugs use shape-matched authored textiles. Rain and wind are synthesized, not sampled.

Skeleton anatomy adapted from Blender Studio’s Human Base Meshes (CC0), with a custom walking rig. Anatomy reference: OpenStax Anatomy and Physiology.

Thunder field recordings by BlueDelta (CC0) and the U.S. National Park Service, edited for this room.

Capture

Aspect

Size

Format

Length

Captures only the room, not the screen.