Seed

A browser previewer for SCP: Containment Breach map seeds. Type a seed, get the facility layout it will generate — zones, corridor shapes, checkpoints and every hand-placed room — before you load into the game.

Static site, no build step, no dependencies.

cd seed
python3 -m http.server 8080
# open http://localhost:8080

It uses ES modules, so it needs to be served over HTTP — opening index.html straight off disk will not work.

What it does

• Exact layout. The corridor skeleton, per-cell room shape (dead end / straight / corner / T / crossroads), zone boundaries and checkpoint positions are reproduced from the game's own generator.
• Exact named rooms. SCP chambers, the lockrooms, the warhead room, Gate A, the intercom room and the rest are placed at the same grid cells the game places them.
• Missing-room detection. On some seeds the game books a room slot it never reaches, and that room simply is not in the facility. Those seeds are flagged.
• Share links. The seed lives in ?seed=, so a link reproduces the map.
• Room detail. Click any cell for its zone, shape, rotation, world coordinates and a teleport console command.

What it does not do

Two details are approximated, and the UI says so:

1. Rotation of plain straight corridors. The game rolls for which way round these sit.
2. Which filler template fills an unnamed slot. Unnamed cells list their possible templates rather than guessing one.

Both are drawn from the same random stream the game also uses to scatter props and items inside each room as it builds them. Reproducing them would mean simulating the whole room-filling pass. Everything listed under "what it does" is unaffected — it is all decided before the first room is built.

Layout

index.html              markup
css/app.css             styling
js/blitz-rng.js         BlitzBasic-compatible RNG + seed-string hashing
js/facility.js          the layout generator
js/room-templates.js    room template table (shape, zones, commonness)
js/room-labels.js       display names for the hand-placed rooms
js/app.js               canvas renderer and UI

Notes

Fan project. Not affiliated with Undertow Games or the CB development team. SCP Foundation content is licensed CC BY-SA 3.0.