A scrambled light-signal pulses over the horizon: six colors of the spectrum locked in a hidden order. Your job is to decrypt the sequence before the sun sets.

Every guess burns one hour of daylight — the sun slides down its arc, the sky bleeds from noon-blue to golden dusk to indigo night, and the stars come out. Crack the code and the beacon fires; run out of light and darkness wins.

The machine that grades your guesses is The Bombe — the device Alan Turing designed to break the Enigma cipher.

• 🎨 Living sky — a Canvas day/night cycle (sun arc, fading stars, drifting light-motes, a ghost moon) driven entirely by your remaining daylight.
• 🧩 Real deduction — a Mastermind-style cipher with duplicate colors and gold / hollow feedback pegs.
• ⚙️ The Bombe Assist — spend a charge to let Turing's machine lock one correct position (2 per level).
• 🔊 Procedural audio — retro machine tones via the Web Audio API (no sound files).
• 📈 Endless ramp + scoring — codes grow 4 → 5 → 6 symbols; high score saved locally.
• ⌨️ Keyboard-first and colorblind-friendly (every orb is numbered 1–6).
• 📦 One file, zero dependencies, no build.

You're trying to match a hidden sequence of colored light-glyphs. After each guess, The Bombe tells you how close you are:

• 🟡 Gold peg — right color, right position
• ⚪ Hollow peg — right color, wrong position

Use the feedback to deduce the exact order before your daylight runs out.

Mouse and touch work too (click an orb to cycle it, click a color in the legend to set it), but the game is tuned for a laptop keyboard.

No toolchain required — it's a single static file.

git clone https://github.com/longphanquangminh/solstice-cipher.git
cd solstice-cipher
# then just open the file:
open index.html        # macOS
# xdg-open index.html  # Linux
# start index.html     # Windows

Or serve it (recommended so localStorage high-scores persist):

python3 -m http.server 8000
# visit http://localhost:8000

1. Make sure the game file is named index.html in the repo root.
2. Settings → Pages → Build and deployment → Source: Deploy from a branch, branch main / root.
3. Your game goes live at https://longphanquangminh.github.io/solstice-cipher/.

• HTML5 Canvas — sky, sun, stars, particles, screen shake
• DOM + CSS — board, glassmorphism HUD, animations (Space Grotesk + Space Mono)
• Web Audio API — procedural sound effects
• Vanilla JavaScript — game logic, no framework

round score = level × 100  +  daylight saved × 15  +  Bombe charges held × 40

Your total carries across levels until night finally falls. Best score is stored in localStorage.

solstice-cipher/
├── index.html      # the entire game (markup, styles, logic)
├── gameplay.png    # screenshot for README / repo card
└── README.md

• Fully playable with the keyboard alone.
• Every color glyph carries a number (1–6), so the puzzle is solvable without relying on hue.
• High-contrast HUD and large, glowing targets.

MIT — free to play, fork, and learn from.