Run Detail
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Provider
openrouter
Challenge Version
v1.0
Turns
1
Duration
16.9s
Total Tokens
4,364
Input Tokens
692
Output Tokens
3,672
Reasoning Tokens
53
Reasoning Effort
default
Est. Cost
$0.0000
Started
11/3/2026, 9:22:59 PM
OR Provider
Stealth
Finish Reason
stop
Generation ID
gen-1793740979-twctiF10NpmER0kkAY9N
Turns (1)
Turn #1
692 in3,672 out53 reasoning4,364 total16.9s
user
You are a game developer who ships browser demos that have to work on the first click, in front of an audience, on someone else's laptop.
Build me a Tesla Cybertruck monster-truck rally as one self-contained HTML page. A fairly small stadium, a big crowd in the stands, artificial hills and debris across the floor, and trucks slamming into each other.
Then make it match the spec below exactly. The spec is the challenge; a great-looking rally that ignores it is a miss.
The build
- One file. Everything — HTML, CSS, JS — in a single
.htmlpage. No build step. Saved to disk and double-clicked, it runs. - One external request, maximum. You may load three.js from a CDN, pinned to an exact version. That is the only network request the page is permitted to make. No second library, no font, no stylesheet, no image file, no audio file.
- Sound is optional, and if you include it, generate it with the Web Audio API. No audio assets.
- No storage. No
localStorage,sessionStorage, cookies orindexedDB. It runs in a sandboxed frame where touching them throws.
The spec
- Exactly five trucks. One the player drives, four rivals under AI. Not four, not six — five.
- Name the arena. Invent a name for the venue and show it in the HUD, on screen, during play.
- The HUD shows the arena name, a score, and a clock. Nothing else is required.
- At least three distinct obstacle types on the floor — the trucks should have something to hit besides each other.
- A crowd in the stands that is visibly a crowd, all the way round.
- Drive with the keyboard. Arrow keys or WASD. Say which in the HUD or an overlay.
- Collisions matter. Ramming a rival does something — score, a visible reaction, a wreck state. Your call, but it must be visible.
Two modes that are not the game
Both are checkable in ten seconds, which is why they are here.
#demo— if the page URL ends in#demo, the game starts with 20 seconds on the clock and the score already at 5000. This must run through the real game state, not a cosmetic overlay. Everything else behaves normally.Pfor photo mode — pressingPfreezes the action and overlays the arena name and the current score, held untilPis pressed again. The simulation stops; it does not keep playing behind the card.
Answer in exactly these sections
The pitch
One sentence: the name of your rally and what it looks like.
The game
Exactly one fenced html block containing the whole page and nothing else.
The notes
Exactly four bullets.
- Five trucks: how you kept four AI rivals from clumping into one moving wall.
- Demo mode: the line of real game state
#demosets, and why it is not an overlay. - Photo mode: what you actually stop when
Pis pressed — the render loop, the physics step, or both. - Collisions: one short paragraph on the collision model you implemented. Not what it looks like — what it computes.
assistant
The pitch
Neon Dust Bowl Cybertruck Rally is a monster-truck demolition derby in a floodlit stadium bowl where five wedge-bodied Cybertrucks slam over dirt mounds, tire stacks, and crates in front of a bobbing crowd.
The game
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>Neon Dust Bowl — Cybertruck Rally</title>
<style>
html,body{margin:0;height:100%;overflow:hidden;background:#0b0e1a;font-family:Arial,Helvetica,sans-serif;color:#fff}
#c{position:fixed;inset:0;display:block}
#hud{position:fixed;top:0;left:0;right:0;display:flex;justify-content:space-between;align-items:center;padding:10px 16px;background:linear-gradient(rgba(0,0,0,.65),transparent);pointer-events:none;z-index:5}
#arena{font-weight:900;letter-spacing:2px;color:#7df9ff;text-shadow:0 0 10px #0ff}
.stat{font-size:20px;font-weight:800}
#score{color:#ffe45e} #clock{color:#ff8a5e}
#help{position:fixed;bottom:10px;left:50%;transform:translateX(-50%);background:rgba(0,0,0,.55);padding:6px 12px;border-radius:20px;font-size:13px;z-index:5;pointer-events:none}
#photo{position:fixed;inset:0;display:none;align-items:center;justify-content:center;flex-direction:column;background:rgba(0,0,0,.35);z-index:10;text-align:center}
#photo h1{font-size:52px;margin:0;letter-spacing:3px;color:#7df9ff;text-shadow:0 0 18px #000}
#photo p{font-size:34px;font-weight:900;color:#ffe45e;text-shadow:0 0 12px #000}
#end{position:fixed;inset:0;display:none;align-items:center;justify-content:center;flex-direction:column;background:rgba(0,0,0,.6);z-index:9;text-align:center}
</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/0.160.0/three.min.js"></script>
</head>
<body>
<canvas id="c"></canvas>
<div id="hud">
<div id="arena">NEON DUST BOWL</div>
<div class="stat">SCORE <span id="score">0</span></div>
<div class="stat">TIME <span id="clock">120</span></div>
</div>
<div id="help">Drive: WASD or Arrow Keys | P = Photo Mode | Ram rivals for points!</div>
<div id="photo"><h1>NEON DUST BOWL</h1><p>SCORE <span id="photoScore">0</span></p><small>Press P to resume</small></div>
<div id="end"><h1>TIME UP</h1><p id="final"></p></div>
<script>
const ARENA_NAME = "NEON DUST BOWL";
let score = 0, timeLeft = 120;
if (location.hash === "#demo") { timeLeft = 20; score = 5000; }
const canvas = document.getElementById('c');
const renderer = new THREE.WebGLRenderer({canvas, antialias:true});
renderer.setSize(innerWidth, innerHeight);
renderer.setPixelRatio(Math.min(devicePixelRatio,2));
const scene = new THREE.Scene();
scene.background = new THREE.Color(0x0b0e1a);
scene.fog = new THREE.Fog(0x0b0e1a, 40, 90);
const camera = new THREE.PerspectiveCamera(62, innerWidth/innerHeight, 0.1, 200);
scene.add(new THREE.AmbientLight(0xffffff, 0.55));
const sun = new THREE.DirectionalLight(0xffffff, 1.2);
sun.position.set(20,30,10); scene.add(sun);
const p1 = new THREE.PointLight(0x00ffff, 1, 60); p1.position.set(-20,10,0); scene.add(p1);
const p2 = new THREE.PointLight(0xff00aa, 1, 60); p2.position.set(20,10,0); scene.add(p2);
// Floor
const floor = new THREE.Mesh(new THREE.PlaneGeometry(64,64), new THREE.MeshLambertMaterial({color:0x3a2a1a}));
floor.rotation.x = -Math.PI/2; scene.add(floor);
const ring = new THREE.Mesh(new THREE.RingGeometry(26,31,48), new THREE.MeshBasicMaterial({color:0x7df9ff, side:THREE.DoubleSide}));
ring.rotation.x = -Math.PI/2; ring.position.y = 0.02; scene.add(ring);
// Stands (4 sides)
const standMat = new THREE.MeshLambertMaterial({color:0x222a44});
[[-32,0,0],[32,0,0],[0,-32,Math.PI/2],[0,32,Math.PI/2]].forEach(s=>{
const st = new THREE.Mesh(new THREE.BoxGeometry(64,7,6), standMat);
st.position.set(s[0],3.5,s[1]); st.rotation.y = s[2]; scene.add(st);
});
// Crowd - instanced, all the way round
const CROWD_N = 900;
const crowd = new THREE.InstancedMesh(new THREE.BoxGeometry(0.5,0.8,0.5), new THREE.MeshLambertMaterial({color:0xffffff}), CROWD_N);
const crowdData = [];
const dummy = new THREE.Object3D(); const col = new THREE.Color();
for(let i=0;i<CROWD_N;i++){
const side = i % 4; const t = -28 + (i*0.37)%56; const row = Math.floor(i/225)%3;
let x,z,y=7+row*0.9;
if(side===0){x=t;z=-29-row*1.2} else if(side===1){x=t;z=29+row*1.2}
else if(side===2){x=-29-row*1.2;z=t} else {x=29+row*1.2;z=t}
crowdData.push({x,y,z,ph:Math.random()*6.28,sp:2+Math.random()*3});
col.setHSL(Math.random(),0.7,0.55); crowd.setColorAt(i,col);
}
scene.add(crowd);
// Obstacles: 3 types
const obstacles = []; // {x,z,r,mesh,type}
function addObstacle(mesh,x,z,r,type){ mesh.position.set(x,0,z); scene.add(mesh); obstacles.push({x,z,r,mesh,type}); }
// Type 1: dirt mounds
[[-12,-10],[10,-14],[0,12],[-16,14],[16,10]].forEach(p=>{
const m=new THREE.Mesh(new THREE.ConeGeometry(3,1.6,10), new THREE.MeshLambertMaterial({color:0x8b5a2b}));
m.position.y=0.8; addObstacle(m,p[0],p[1],2.8,'mound');
});
// Type 2: tire stacks
[[-8,0],[8,4],[-4,-18],[14,-4],[0,-6]].forEach(p=>{
const g=new THREE.Group();
for(let i=0;i<3;i++){ const t=new THREE.Mesh(new THREE.CylinderGeometry(1.1,1.1,0.6,12), new THREE.MeshLambertMaterial({color:0x111111})); t.position.y=0.3+i*0.6; g.add(t); }
addObstacle(g,p[0],p[1],1.4,'tire');
});
// Type 3: crates (movable)
[[-18,-4],[18,16],[-10,20],[20,-18],[6,18]].forEach(p=>{
const c=new THREE.Mesh(new THREE.BoxGeometry(1.8,1.8,1.8), new THREE.MeshLambertMaterial({color:0xc98a2e}));
c.position.y=0.9; addObstacle(c,p[0],p[1],1.5,'crate');
});
// Trucks
function makeTruck(color){
const g=new THREE.Group();
const body=new THREE.Mesh(new THREE.BoxGeometry(2,0.7,4.2), new THREE.MeshLambertMaterial({color}));
body.position.y=0.9; g.add(body);
const top=new THREE.Mesh(new THREE.BoxGeometry(1.8,0.7,2.4), new THREE.MeshLambertMaterial({color:0xdddddd}));
top.position.set(0,1.45,-0.4); top.rotation.x=-0.35; g.add(top);
const bar=new THREE.Mesh(new THREE.BoxGeometry(1.9,0.15,0.2), new THREE.MeshBasicMaterial({color:0xffffff}));
bar.position.set(0,1.15,2.12); g.add(bar);
const wg=new THREE.CylinderGeometry(0.62,0.62,0.45,14);
const wm=new THREE.MeshLambertMaterial({color:0x111111});
[[-1.05,1.4],[1.05,1.4],[-1.05,-1.4],[1.05,-1.4]].forEach(p=>{
const w=new THREE.Mesh(wg,wm); w.rotation.z=Math.PI/2; w.position.set(p[0],0.62,p[1]); g.add(w);
});
scene.add(g); return g;
}
const trucks=[];
const colors=[0xff3333,0x33ff66,0x3399ff,0xffcc00,0xff33ff];
for(let i=0;i<5;i++){
const mesh=makeTruck(colors[i]);
const angle=i/5*Math.PI*2;
trucks.push({mesh,x:Math.cos(angle)*14,z:Math.sin(angle)*14,heading:-angle+Math.PI/2,speed:0,health:100,wrecked:false,respawn:0,isPlayer:i===0,steer:0,smoke:0});
}
trucks[0].mesh.position.set(trucks[0].x,0,trucks[0].z);
// Input
const keys={};
addEventListener('keydown',e=>{ keys[e.key.toLowerCase()]=true;
if(e.key.toLowerCase()==='p'){ togglePhoto(); }
if(['arrowup','arrowdown','arrowleft','arrowright',' '].includes(e.key.toLowerCase())) e.preventDefault();
});
addEventListener('keyup',e=>{ keys[e.key.toLowerCase()]=false; });
let photoMode=false, raf=null, last=performance.now(), gameOver=false;
function togglePhoto(){
photoMode=!photoMode;
document.getElementById('photo').style.display = photoMode?'flex':'none';
document.getElementById('photoScore').textContent = score;
if(photoMode){ if(raf) cancelAnimationFrame(raf); raf=null; }
else { last=performance.now(); raf=requestAnimationFrame(loop); }
}
function updateTruck(t,dt){
if(t.wrecked){ t.speed*=0.9; t.respawn-=dt; if(t.respawn<=0 && !t.isPlayer){ t.health=100; t.wrecked=false; t.x=0; t.z=0; t.speed=0; t.mesh.rotation.set(0,0,0);} if(t.isPlayer && t.respawn<=0){ t.health=100; t.wrecked=false; t.x=0; t.z=10; t.speed=0; } }
let throttle=0, steer=0;
if(!t.wrecked){
if(t.isPlayer){
if(keys['w']||keys['arrowup']) throttle=1;
if(keys['s']||keys['arrowdown']) throttle=-0.6;
if(keys['a']||keys['arrowleft']) steer=1;
if(keys['d']||keys['arrowright']) steer=-1;
} else {
// AI: seek nearest non-wrecked opponent, with separation from other AI
let target=trucks[0], best=1e9;
trucks.forEach(o=>{ if(o!==t && !o.wrecked){ const d=(o.x-t.x)**2+(o.z-t.z)**2; if(d<best){best=d;target=o;} }});
const desired=Math.atan2(target.x-t.x, target.z-t.z);
let diff=desired-t.heading; while(diff>Math.PI)diff-=Math.PI*2; while(diff<-Math.PI)diff+=Math.PI*2;
steer = -Math.max(-1,Math.min(1,diff*2));
throttle = Math.abs(diff)>2.2 ? -0.5 : 1;
// separation: repel from other AI to avoid clumping
trucks.forEach(o=>{ if(o!==t && !o.isPlayer){ const dx=t.x-o.x, dz=t.z-o.z, d=Math.hypot(dx,dz); if(d>0.01 && d<7){ steer += (dx*0.3); t.x += dx/d*dt*3; t.z += dz/d*dt*3; } }});
// obstacle avoidance
obstacles.forEach(o=>{ const dx=t.x-o.x, dz=t.z-o.z, d=Math.hypot(dx,dz); if(d<o.r+3 && d>0.01){ t.x+=dx/d*dt*4; t.z+=dz/d*dt*4; }});
}
}
t.speed += throttle*18*dt; t.speed*= (1-1.2*dt); t.speed=Math.max(-8,Math.min(16,t.speed));
t.heading += steer*1.8*dt*(t.speed>=0?1:-1)*Math.min(1,Math.abs(t.speed)/4+0.3);
t.x += Math.sin(t.heading)*t.speed*dt; t.z += Math.cos(t.heading)*t.speed*dt;
// arena bounds
const d=Math.hypot(t.x,t.z); if(d>27){ t.x*=27/d; t.z*=27/d; t.speed*=0.6; }
// obstacle collisions (circle)
obstacles.forEach(o=>{
const dx=t.x-o.x, dz=t.z-o.z, dist=Math.hypot(dx,dz), min=o.r+1.4;
if(dist<min && dist>0.01){
const push=(min-dist); t.x+=dx/dist*push; t.z+=dz/dist*push;
if(o.type==='crate'){ o.x+=dx/dist*push*0.7; o.z+=dz/dist*push*0.7; o.mesh.position.set(o.x,0.9,o.z); o.mesh.rotation.y+=dt*2; }
if(Math.abs(t.speed)>6){ t.health-=4; if(t.isPlayer) score=Math.max(0,score-10); }
t.speed*=0.55;
}
});
t.mesh.position.set(t.x,0,t.z); t.mesh.rotation.y=t.heading;
if(t.wrecked){ t.mesh.rotation.z=0.25; t.smoke+=dt; if(t.smoke>0.1){ t.smoke=0; const s=new THREE.Mesh(new THREE.SphereGeometry(0.3,6,6), new THREE.MeshBasicMaterial({color:0x555555,transparent:true,opacity:0.6})); s.position.set(t.x,1.5,t.z); scene.add(s); setTimeout(()=>scene.remove(s),800);} }
else t.mesh.rotation.z=0;
}
// Truck-truck collisions
function collideTrucks(dt){
for(let i=0;i<trucks.length;i++) for(let j=i+1;j<trucks.length;j++){
const a=trucks[i], b=trucks[j];
const dx=b.x-a.x, dz=b.z-a.z, dist=Math.hypot(dx,dz), min=3.2;
if(dist<min && dist>0.01){
const nx=dx/dist, nz=dz/dist, push=(min-dist)/2;
a.x-=nx*push; a.z-=nz*push; b.x+=nx*push; b.z+=nz*push;
const rel=Math.abs(a.speed-b.speed)+Math.abs(a.speed)+Math.abs(b.speed);
const attacker = Math.abs(a.speed)>Math.abs(b.speed)?a:b;
const victim = attacker===a?b:a;
if(rel>5 && !victim.wrecked){
victim.health-=rel*1.2; victim.speed*=0.4; victim.heading+=(Math.random()-0.5)*1.2;
if(attacker.isPlayer){ score+=250; }
if(victim.health<=0){ victim.wrecked=true; victim.respawn=4; victim.speed=0; if(attacker.isPlayer) score+=500; }
}
a.speed*=0.85; b.speed*=0.85;
}
}
}
function loop(now){
if(photoMode) return;
raf=requestAnimationFrame(loop);
const dt=Math.min(0.033,(now-last)/1000); last=now;
if(!gameOver){
timeLeft-=dt; if(timeLeft<=0){ timeLeft=0; gameOver=true; document.getElementById('end').style.display='flex'; document.getElementById('final').textContent='FINAL SCORE '+score; }
trucks.forEach(t=>updateTruck(t,dt)); collideTrucks(dt);
}
// crowd bob
for(let i=0;i<CROWD_N;i++){ const c=crowdData[i]; dummy.position.set(c.x,c.y+Math.abs(Math.sin(now/1000*c.sp+c.ph))*0.3,c.z); dummy.rotation.y=c.ph; dummy.updateMatrix(); crowd.setMatrixAt(i,dummy.matrix); }
crowd.instanceMatrix.needsUpdate=true;
document.getElementById('score').textContent=score;
document.getElementById('clock').textContent=Math.ceil(timeLeft);
// chase camera behind player
const p=trucks[0];
camera.position.set(p.x-Math.sin(p.heading)*12,7,p.z-Math.cos(p.heading)*12);
camera.lookAt(p.x,p.y+1,p.z);
renderer.render(scene,camera);
}
raf=requestAnimationFrame(loop);
addEventListener('resize',()=>{ camera.aspect=innerWidth/innerHeight; camera.updateProjectionMatrix(); renderer.setSize(innerWidth,innerHeight); });
</script>
</body>
</html>
The notes
- Five trucks: Each AI steers toward its nearest opponent but adds a separation repulsion from every other AI within 7 units and obstacle avoidance, so rivals spread out instead of forming a single moving wall, and truck-truck push-out resolves any remaining overlap.
- Demo mode: The line
if (location.hash === "#demo") { timeLeft = 20; score = 5000; }sets the realtimeLeftandscorevariables used by the HUD, timer, and scoring logic, so the 20-second clock counts down and points accumulate from 5000 through the normal game state, not a cosmetic overlay. - Photo mode: Pressing
PsetsphotoMode, cancels therequestAnimationFrameloop, and shows the DOM overlay; both the render loop and the physics step stop becauseloop()returns immediately and no new frame is scheduled untilPis pressed again to restart it. - Collisions: Trucks and obstacles are modeled as circles in the XZ plane with a heading and scalar speed; each step computes pairwise distance, pushes overlapping circles apart along the normal by half the penetration each, damps speed, transfers damage proportional to relative speed to the slower truck, awards score to a player attacker, and triggers a wreck state at zero health, while crates are displaced as movable circles and mounds/tires act as static circles.
Attachments
stealth/crouton-alpha — page