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Black Hole Prime Factors in play

Screen · Touch, Mouse

Black Hole Prime Factors

Tap composites to split them, drag the primes into a black hole: prime factorization as a four-stage touch game.

Surface: A landscape touch screen or touch kiosk, ideally 16:9 such as 1920×1080. The game scales to fit other sizes.
Input: Touch: tap and drag. A mouse works for testing. It is not suited to floor or wall sensors that report only single steps. No drivers are included.
PC: Windows PC with Chrome or Edge (one-click kiosk launcher included), or Chrome on a Mac. No internet needed; top scores and settings stay in that browser.

Free · Windows & macOS · 136 KB · Download appears right after the form

See it with real people

In real use

See it with real people

Tapping composites to split them and dragging primes into the black hole on a portrait touch kiosk.

Filmed in Korea on an earlier build, so any on-screen text is in Korean. The evaluation build is in English.

Watch on YouTube See more real installs

Who it's for

Made for spaces like yours

Schools and math classrooms working on primes and factors
Science centers, museums and libraries with a touch screen or touch kiosk
Education fairs and school open days that want a hands-on math game

What it does for you

For you and your visitors

The math is the controls: tap 12 and it splits into 3 and 4, with the equation shown on screen. Only primes go in the black hole; a composite gets spat back out and costs points.
Four timed stages build up, from 5 planets with numbers up to 30 to 30 planets with numbers up to 200. Combo bonuses and a Top 10 list on the PC give players a reason to go again.
A three-slide How to Play on the title screen explains primes and composites, and prime planets glow as a hint. You can switch the glow off.
Set up in minutes, run it yourself: it runs offline, returns to the title screen when left alone, and config.js sets the number ranges, time limits, title text and logo, so you can fit it to your class or venue.

Tap a composite and it splits in two with the equation on screen: here 56 = 7 × 8, and the prime 7 glows.

Keep landing primes and the combo climbs: at 5 COMBO, a prime worth 70 points earns 200 more.

Drop a composite in and the black hole flashes red: 75 points off, with a reminder to split it first.

Stage 4 starts with 30 planets, numbers up to 200 and a 140-second limit.

Clear all four stages for fireworks and a Top 10 list kept on that PC.

A three-slide How to Play, one button from the title screen, explains primes and composites.

Press Esc to change the volume, music, character and background.

Hardware

What it runs on

Runs on any touch screen your computer sees as a touch device. Looking for hardware? Ask us which MP Series unit fits your space.

See the MP Series

Make it yours

Change it yourself, or let us

These settings live in customize/config.js inside the download. Edit, save, reload.

Setting	What it changes	Default
Title`text.title`	The big heading on the title screen and the browser tab title. Longer titles shrink to fit.	`Black Hole Prime Factors`
Subtitle`text.subtitle`	The line under the title.	`Break every planet down into primes and feed them to the black hole!`
Your logo`logo.file`	Path to a PNG or JPG in the folder (e.g. customize/logo.png), shown top-left on the title screen. Empty = no logo.	empty
Logo size`logo.height`	Logo height in pixels on a 1920x1080 screen (30 to 300).	`120`
Stages`stages`	The stage list, played in order: planets, seconds, smallest and largest number on a planet for each stage (1 to 8 stages, numbers up to 999). Smaller numbers and more seconds make it easier.	`4 stages: 5 planets/30 s (4-30), 10/60 s (4-60), 20/90 s (6-100), 30/140 s (6-200)`
Planet speed`game.planet_speed`	How fast planets drift: 0.5 is half speed, 2 is double (0.2 to 3).	`1`
Combo time`game.combo_seconds`	Seconds a player has to land the next prime and keep a combo going (1 to 20).	`3.5`
Prime glow`game.prime_glow`	Prime planets glow as a hint. Set to false to make players spot primes by the number; the How to Play text changes with it.	`true`
Wrong-drop penalty`game.wrong_drop_penalty`	Points lost for dropping a composite in the black hole: its number times this value (0 = no penalty, up to 50).	`5`
Result time`timing.result_seconds`	Clear, time's-up and all-clear screens go back to the title after this many seconds (5 to 300). A touch keeps a clear or time's-up screen up.	`20`
Idle return`timing.idle_return_seconds`	Any other screen left untouched goes back to the title after this many seconds (0 = never, up to 600).	`60`
Top scores listed`leaderboard.size`	How many top scores the all-clear screen keeps and lists (3 to 20).	`10`
Music volume`sound.music_volume`	Background music, 0 to 100. Also adjustable in the Esc panel.	`40`
Effects volume`sound.effects_volume`	Split, drop and reject sounds, 0 to 100. Also adjustable in the Esc panel.	`70`
Music track`sound.music_track`	cosmic, tense or retro. Each has one melody for menus and another for play. Also in the Esc panel.	`cosmic`
Character`screen.character`	The helper in the corner: astronaut, alien, robot or cat. The Esc panel can also upload your own image.	`astronaut`
Background`screen.background`	Image behind everything, path relative to index.html. Empty = animated stars on black. The default is a nebula image included in the download.	`assets/nebula.jpg`

Need more than settings?

Your logo and colors, another language, your own questions or content, or a new piece on the same idea.

Specs

Technical details

Package size: Windows & macOS: 136 KB 139,060 bytes
Operating system: Windows & macOS
Entry file: index.html
Resolution: 1920x1080 (16:9, scaled to fit any window with the shape kept)
Orientation: Landscape
Offline: Yes, no internet needed
UI language: English
Input: Touch, Mouse
Players: 1 at a time; several hands can drag at once on a multi-touch screen
Session length: Stage time limits of 30, 60, 90 and 140 seconds, so about 5 minutes at most for all four
Version: 1.1 · built Nov 2, 2026

Checksums (SHA-256)

blackhole-prime-factorization-all.zipbe6ab8106c5e84f460052eb969cdf12f199485a6b78f9f206769c61fbcefa7df

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