Topkapı Gecesi

Highlights

• Real stealth rules. Halberdiers, harem guards, the head cook and his cat walk patrol routes, stop and look around, and their vision cones are drawn on the ground. The bright inner part of a cone sees you even in shadow; the faint outer part sees you only when you stand in lantern light.
• Light and shadow matter. Walls and cypresses cast moon shadows, lanterns and braziers make warm pools of light, and the visibility meter shows how far a guard could see you right now. Snuff a lantern and its pool goes dark; a guard who passes it later lights it again.
• Noise and guard states. Running, gravel, a dash or a knocked-over vase sends out a sound ring. Guards go from patrol to suspicious (?, they walk over to look) to alarm (!, they chase and call the guards nearby), then search and return to the route. A thrown pebble lures them away. The cat cannot catch you, but it meows.
• 9 night missions in 3 parts. The Courts, the Harem and the Treasury. Each mission has an optional objective (a lost tulip bulb, a secret letter or "be a ghost") and three stars: unseen, swift and the optional objective, 27 in all.
• A bot that really plays. ?auto plays all nine missions with the same inputs a player has: it predicts the patrols and plans a timed route with a space-time A* search that keeps out of every cone and noise ring. Measured: 9/9 missions, 27/27 stars, 0 alarms, 60 fps, 26-33 draw calls.
• Night music that reacts. A synthesised ney line over a kanun ostinato in makam Hicaz, crickets, a fountain and footsteps on stone, gravel, marble and carpet. When a guard grows suspicious the kanun speeds up and a darbuka joins.
• One file, made in code. One index.html with Three.js r170 from a CDN; every mesh, texture and sound is generated in code. Turkish by default, English with one key.

How to play

[!TIP] Crouch (C) in the shadows and watch the cones. Wait until a guard turns away, then move. A pebble (Q) thrown behind a guard pulls him off his route for a few seconds.

Each mission: pick up the clue (a scroll, the real diamond, the treasury key), then reach the gold ring at the exit (or set the diamond on the pedestal in the last mission). Dawn comes after seven minutes. Hide behind curtains or in chests, snuff lanterns and throw pebbles; being caught sends you back to the last quiet fountain (checkpoint).

Part	Mission	Optional objective	Target time
The Courts	1. The Middle Gate	lost tulip bulb	1:10
The Courts	2. The Palace Kitchens	secret letter	2:10
The Courts	3. The Divan Square	be a ghost	1:10
The Harem	4. The Consorts' Courtyard	lost tulip bulb	1:20
The Harem	5. The Golden Road	be a ghost	2:00
The Harem	6. The Imperial Hall	secret letter	1:30
The Treasury	7. The Enderun Court	lost tulip bulb	1:15
The Treasury	8. The Baghdad Kiosk	be a ghost	1:35
The Treasury	9. The Treasury	secret letter	2:30

Stars: unseen (no alarm), swift (within the target time) and the optional objective.

Controls

Action	Keyboard / mouse	Touch
Move	WASD or arrow keys	left stick
Run	hold Shift	Run button (hold)
Crouch	C toggles, hold Ctrl	Crouch button
Dash	Space	Dash button
Interact: hide, come out, snuff, pick up, place	E	Use button
Throw a pebble	Q (lands at the mouse ring, at most 9 m)	Pebble button (throws ahead)
Orbit the camera / zoom	drag / mouse wheel	drag / pinch
Pause	P or Esc	Pause button
Music / effects / language	M / X / L	top bar buttons

Settings are saved in localStorage under arena.topkapi.settings, progress under arena.topkapi.save and the best result under arena.topkapi.best.

Flag	Effect
?auto	the bot plays all nine missions and the ending
?debug	fps, draw calls, triangles, GPU and JS errors on screen; window.topkapiSim(seconds) fast-forwards without rendering
?sim=N	fast-forward N seconds before the first frame
?low	Low quality: no shadows, half the particles, pixel ratio 1
?mission=N	start mission N directly
?screen=map / ?screen=end	open the palace map or the ending screen
?speed=N	game speed multiplier during missions
?lang=en / ?lang=tr	language
?nosave	do not read or write progress
?noassets	accepted; the game has no asset files, so nothing changes

The live state is on window.topkapi (screen, mission, player, guards, stars, bot log, fps, draw calls, errors, assets).

Screenshots

Running locally

Serve the folder over HTTP, for example:

python -m http.server 8000

then open http://localhost:8000/.

How it was made

Built by Claude Opus 5.5 with Claude Code from one prompt: prompts/topkapi-gecesi.md. Everything is generated in code, so there are no asset files and no credits to list.

• Simulation core: the rules (grid, light, sight, noise, guard states, player and the planner bot) live in one plain CORE script with no DOM or Three.js, so the same code runs in the page and in node tests.
• Bot: it predicts the guard patrols and plans a timed route with a space-time A* search over (cell, 0.2 s) that keeps out of every cone and noise ring, hides behind a curtain when that is the only safe spot, and replans whenever a guard leaves its route.
• 3D: the level is merged into a few static meshes with vertex colours; lantern light is baked into a vertex attribute and rebaked only when a lantern is snuffed or relit. One moon light with a 1024 shadow map covers only the palace grounds.
• Performance: measured in headless Chrome on an Intel UHD 620 (i5-10210U) at 1280x720: 60 fps, 26-33 draw calls and 16k-28k triangles during play.

Topkapı Gecesi is part of the Claude Game Arena series, where each game is built by a Claude model from one prompt. The other games: Hisar · Çay Ocağı · Çini Ustası · Martı · Kervan · Dolmuş · Peri Golf · Mehter · Boğaz Vapuru · Simit Fırını · Karagöz · Lale Bahçesi

Round 5: Kapadokya Balonu · Ebru · Kırkpınar · Çarşı Kaçışı

Round 6: Topkapı Gecesi · Hamsi · Pamukkale · Mimar Sinan

Türkçe

Topkapı Gecesi, gece bir Osmanlı sarayında geçen 3D gizlilik oyunu. Kaşıkçı Elması sahtesiyle değiştirilmiş; genç bir iç oğlanı olarak avlulardan, Harem'den ve Hazine'den gizlice geçip ipuçlarını bulur, gerçek elması şafaktan önce yerine koyarsın. Muhafızların görüş konileri, fener ışığı ve gürültü önemli: gölgede çömel, fenerleri söndür, çakıl taşı atıp muhafızları uzaklaştır. 3 bölümde 9 gece görevi, 27 yıldız. Kurulum yok; masaüstünde ve telefonda tarayıcıda oynanır. Claude Opus 5.5 tarafından Claude Code ile tek bir prompt'tan yapıldı.

Oyna: https://furkiozknn.github.io/topkapi-gecesi/

License

MIT, see LICENSE.

Like the game? You can support new rounds on Buy Me a Coffee. The game stays free.