From a848a6854bd2cc83d3711f82eda5d1473da35ff9 Mon Sep 17 00:00:00 2001
From: OpenClaw Engineer <engineer@local.dev>
Date: Wed, 4 Mar 2026 06:58:36 -0600
Subject: [PATCH] add password start modal, VIP hearts, difficulty, and new
 biome hazards

---
 index.php  |  24 +++++
 js/game.js | 288 +++++++++++++++++++++++++++++++++++++++++++----------
 styles.css |  26 ++++-
 3 files changed, 284 insertions(+), 54 deletions(-)

diff --git a/index.php b/index.php
index 77624c6..c00767a 100644
--- a/index.php
+++ b/index.php
@@ -14,6 +14,30 @@
 
   <canvas id="game" width="960" height="540" aria-label="Dino Land game canvas"></canvas>
 
+  <div id="startScreen">
+    <div class="panel">
+      <h1>Start Dino Land</h1>
+      <form id="startForm">
+        <label for="startPassword">Password</label>
+        <input id="startPassword" type="password" required placeholder="Enter password" />
+
+        <label class="inline-option" for="vipMode">
+          <input id="vipMode" type="checkbox" /> VIP mode (6 hearts)
+        </label>
+
+        <label for="difficulty">Difficulty</label>
+        <select id="difficulty">
+          <option value="easy">Easy</option>
+          <option value="medium" selected>Medium</option>
+          <option value="hard">Hard</option>
+        </select>
+
+        <p id="startError" class="error"></p>
+        <button type="submit">Start Game</button>
+      </form>
+    </div>
+  </div>
+
   <div id="deathScreen" class="hidden">
     <div class="panel">
       <h1>TRex Down!</h1>
diff --git a/js/game.js b/js/game.js
index c6a5221..a9102d6 100644
--- a/js/game.js
+++ b/js/game.js
@@ -9,12 +9,34 @@ const saveScoreFormEl = document.getElementById('saveScoreForm');
 const playerNameEl = document.getElementById('playerName');
 const restartBtnEl = document.getElementById('restartBtn');
 
+const startScreenEl = document.getElementById('startScreen');
+const startFormEl = document.getElementById('startForm');
+const passwordEl = document.getElementById('startPassword');
+const vipModeEl = document.getElementById('vipMode');
+const difficultyEl = document.getElementById('difficulty');
+const startErrorEl = document.getElementById('startError');
+
 const keys = new Set();
 const gravity = 1900;
 const groundY = 420;
-const worldWidth = 6000;
+const worldWidth = 13000;
+
+const DIFFICULTY = {
+  easy: { moveSpeed: 0.9, hazardSpeed: 0.85, pteroSpawn: 2.6, meteorSpawn: 1.9 },
+  medium: { moveSpeed: 1.0, hazardSpeed: 1.0, pteroSpawn: 2.2, meteorSpawn: 1.5 },
+  hard: { moveSpeed: 1.15, hazardSpeed: 1.25, pteroSpawn: 1.7, meteorSpawn: 1.2 }
+};
+
+const BIOMES = [
+  { name: 'Plains', start: 0, end: 2200, sky: '#8ddcff', ground: '#88d34f' },
+  { name: 'Desert', start: 2200, end: 5200, sky: '#f4c983', ground: '#d5ad63' },
+  { name: 'Jungle', start: 5200, end: 8000, sky: '#6ecb8c', ground: '#3d8b4a' },
+  { name: 'Snow', start: 8000, end: 10400, sky: '#d5e9ff', ground: '#edf5ff' },
+  { name: 'Lava', start: 10400, end: worldWidth, sky: '#48302b', ground: '#6b3b32' }
+];
 
 let audioCtx = null;
+let gameConfig = { vipMode: false, difficulty: 'medium' };
 
 function ensureAudioCtx() {
   if (!audioCtx) audioCtx = new (window.AudioContext || window.webkitAudioContext)();
@@ -49,9 +71,7 @@ function playSfx(type) {
     gain.gain.exponentialRampToValueAtTime(0.0001, now + p.dur);
     osc.start(now);
     osc.stop(now + p.dur);
-  } catch (_) {
-    // ignore audio errors in unsupported environments
-  }
+  } catch (_) {}
 }
 
 const waterGaps = [
@@ -62,28 +82,69 @@ const waterGaps = [
   { x: 3900, width: 200 }
 ];
 
-function createInitialState() {
+const lavaPuddles = [
+  { x: 10600, width: 120 },
+  { x: 11180, width: 180 },
+  { x: 11850, width: 130 },
+  { x: 12380, width: 180 }
+];
+
+const cacti = [
+  { x: 2500, width: 28, height: 80 },
+  { x: 2960, width: 32, height: 92 },
+  { x: 3480, width: 24, height: 76 },
+  { x: 4020, width: 30, height: 96 },
+  { x: 4630, width: 32, height: 85 }
+];
+
+const monkeys = [
+  { x: 5600, y: groundY - 150, width: 58, height: 42, vx: -140, range: [5450, 6050] },
+  { x: 6500, y: groundY - 165, width: 62, height: 44, vx: 120, range: [6320, 7000] },
+  { x: 7450, y: groundY - 152, width: 58, height: 42, vx: -130, range: [7250, 7800] }
+];
+
+const sabertooths = [
+  { x: 5900, y: groundY - 42, width: 90, height: 42, vx: -160, range: [5600, 6800] },
+  { x: 7100, y: groundY - 42, width: 96, height: 42, vx: 150, range: [6800, 7900] }
+];
+
+const mammoths = [
+  { x: 8450, width: 160 },
+  { x: 9300, width: 170 },
+  { x: 9950, width: 165 }
+];
+
+function getBiomeAt(x) {
+  return BIOMES.find((b) => x >= b.start && x < b.end) || BIOMES[BIOMES.length - 1];
+}
+
+function createInitialState(config = gameConfig) {
+  const maxHearts = config.vipMode ? 6 : 3;
   return {
-    running: true,
+    running: false,
     dead: false,
     deadReason: '',
     lastTs: performance.now(),
     score: 0,
     stepCarry: 0,
     cameraX: 0,
-    hearts: 3,
+    hearts: maxHearts,
+    maxHearts,
     hitCooldown: 0,
+    floatingTexts: [],
     ants: [
       { x: 1000, y: groundY - 20, width: 22, height: 20, vx: -65, alive: true },
       { x: 1750, y: groundY - 20, width: 22, height: 20, vx: -70, alive: true },
       { x: 2600, y: groundY - 20, width: 22, height: 20, vx: -80, alive: true },
       { x: 3400, y: groundY - 20, width: 22, height: 20, vx: -75, alive: true }
     ],
+    monkeys: monkeys.map((m) => ({ ...m })),
+    sabertooths: sabertooths.map((s) => ({ ...s })),
+    mammoths: mammoths.map((m) => ({ ...m })),
     pterodactyls: [],
     pteroSpawnTimer: 0,
     meteors: [],
     meteorSpawnTimer: 0,
-    floatingTexts: [],
     player: {
       x: 160,
       y: groundY - 76,
@@ -93,7 +154,7 @@ function createInitialState() {
       duckHeight: 48,
       vx: 0,
       vy: 0,
-      speed: 300,
+      speed: 300 * DIFFICULTY[config.difficulty].moveSpeed,
       jumpPower: 760,
       onGround: true,
       ducking: false
@@ -101,11 +162,10 @@ function createInitialState() {
   };
 }
 
-let state = createInitialState();
+let state = createInitialState(gameConfig);
 let saveEligible = false;
 let scoreSavedThisRun = false;
 let saveInFlight = false;
-
 const saveScoreBtnEl = saveScoreFormEl.querySelector('button[type="submit"]');
 
 function setSaveFormBusy(isBusy) {
@@ -125,14 +185,39 @@ window.addEventListener('keydown', (e) => {
 });
 window.addEventListener('keyup', (e) => keys.delete(e.key));
 
+startFormEl.addEventListener('submit', (e) => {
+  e.preventDefault();
+  const pass = passwordEl.value.trim();
+  if (pass !== '1027') {
+    startErrorEl.textContent = 'Wrong password. Try 1027.';
+    return;
+  }
+
+  gameConfig = {
+    vipMode: vipModeEl.checked,
+    difficulty: difficultyEl.value
+  };
+
+  state = createInitialState(gameConfig);
+  keys.clear();
+  scoreSavedThisRun = false;
+  saveEligible = false;
+  setSaveFormBusy(false);
+  startScreenEl.classList.add('hidden');
+  deathScreenEl.classList.add('hidden');
+  state.running = true;
+  startErrorEl.textContent = '';
+});
+
 restartBtnEl.addEventListener('click', () => {
-  state = createInitialState();
+  state = createInitialState(gameConfig);
   keys.clear();
   deathScreenEl.classList.add('hidden');
   saveScoreFormEl.classList.add('hidden');
   saveEligible = false;
   scoreSavedThisRun = false;
   setSaveFormBusy(false);
+  state.running = true;
 });
 
 saveScoreFormEl.addEventListener('submit', async (e) => {
@@ -147,7 +232,6 @@ saveScoreFormEl.addEventListener('submit', async (e) => {
       headers: { 'Content-Type': 'application/json' },
       body: JSON.stringify({ name, score: state.score })
     });
-
     if (!res.ok) throw new Error('Score save failed');
 
     saveEligible = false;
@@ -162,17 +246,44 @@ saveScoreFormEl.addEventListener('submit', async (e) => {
 });
 
 function drawBackground() {
-  ctx.fillStyle = '#8ddcff';
+  const camCenter = state.cameraX + canvas.width / 2;
+  const biome = getBiomeAt(camCenter);
+
+  ctx.fillStyle = biome.sky;
   ctx.fillRect(0, 0, canvas.width, canvas.height);
-  ctx.fillStyle = '#88d34f';
+  ctx.fillStyle = biome.ground;
   ctx.fillRect(0, groundY, canvas.width, canvas.height - groundY);
 
+  // Water and lava pits
   for (const gap of waterGaps) {
     const sx = gap.x - state.cameraX;
     if (sx + gap.width < 0 || sx > canvas.width) continue;
     ctx.fillStyle = '#2e8bcf';
     ctx.fillRect(sx, groundY, gap.width, canvas.height - groundY);
   }
+
+  for (const lava of lavaPuddles) {
+    const sx = lava.x - state.cameraX;
+    if (sx + lava.width < 0 || sx > canvas.width) continue;
+    ctx.fillStyle = '#ff5f1f';
+    ctx.fillRect(sx, groundY, lava.width, canvas.height - groundY);
+  }
+
+  // Cactus decoration + hazard body
+  ctx.fillStyle = '#2a8f4a';
+  for (const c of cacti) {
+    const sx = c.x - state.cameraX;
+    if (sx + c.width < 0 || sx > canvas.width) continue;
+    ctx.fillRect(sx, groundY - c.height, c.width, c.height);
+    ctx.fillRect(sx - 8, groundY - c.height + 24, 8, 18);
+    ctx.fillRect(sx + c.width, groundY - c.height + 26, 8, 18);
+  }
+
+  ctx.fillStyle = '#0f0f0f';
+  ctx.font = 'bold 20px Arial';
+  ctx.fillText(`Biome: ${biome.name}`, 18, 70);
+  ctx.fillText(`Difficulty: ${gameConfig.difficulty.toUpperCase()}`, 18, 96);
+  ctx.fillText(gameConfig.vipMode ? 'VIP MODE' : 'STANDARD', 18, 122);
 }
 
 function drawTRex(p) {
@@ -192,8 +303,46 @@ function drawAnts() {
     const sx = ant.x - state.cameraX;
     if (sx + ant.width < 0 || sx > canvas.width) continue;
     ctx.fillRect(sx, ant.y, ant.width, ant.height);
-    ctx.fillRect(sx - 4, ant.y + 6, 4, 4);
-    ctx.fillRect(sx + ant.width, ant.y + 6, 4, 4);
+  }
+}
+
+function drawMonkeys() {
+  ctx.fillStyle = '#6a3f1f';
+  for (const m of state.monkeys) {
+    const sx = m.x - state.cameraX;
+    if (sx + m.width < 0 || sx > canvas.width) continue;
+    ctx.fillRect(sx, m.y, m.width, m.height);
+    ctx.fillRect(sx + m.width / 2 - 3, m.y - 18, 6, 18); // vine
+  }
+}
+
+function drawSabertooths() {
+  ctx.fillStyle = '#c6884e';
+  for (const s of state.sabertooths) {
+    const sx = s.x - state.cameraX;
+    if (sx + s.width < 0 || sx > canvas.width) continue;
+    ctx.fillRect(sx, s.y, s.width, s.height);
+    ctx.fillStyle = '#fff';
+    ctx.fillRect(sx + s.width - 22, s.y + 26, 4, 12);
+    ctx.fillRect(sx + s.width - 14, s.y + 26, 4, 12);
+    ctx.fillStyle = '#c6884e';
+  }
+}
+
+function drawMammoths() {
+  for (const m of state.mammoths) {
+    const sx = m.x - state.cameraX;
+    if (sx + m.width < 0 || sx > canvas.width) continue;
+
+    // body
+    ctx.fillStyle = '#7c8ea1';
+    ctx.fillRect(sx, groundY - 130, m.width, 70);
+    // legs
+    ctx.fillRect(sx + 14, groundY - 60, 24, 60);
+    ctx.fillRect(sx + m.width - 38, groundY - 60, 24, 60);
+    // tusk hint
+    ctx.fillStyle = '#f3f3f3';
+    ctx.fillRect(sx + m.width - 6, groundY - 70, 8, 24);
   }
 }
 
@@ -203,8 +352,6 @@ function drawPterodactyls() {
     const sx = p.x - state.cameraX;
     if (sx + p.width < 0 || sx > canvas.width) continue;
     ctx.fillRect(sx, p.y, p.width, p.height);
-    ctx.fillRect(sx - 8, p.y + 6, 8, 4);
-    ctx.fillRect(sx + p.width, p.y + 6, 8, 4);
   }
 }
 
@@ -220,7 +367,6 @@ function drawMeteors() {
 function addFloatingText(x, y, text, color = '#ffe066') {
   state.floatingTexts.push({ x, y, text, color, ttl: 0.8, vy: -36 });
 }
-
 function updateFloatingTexts(dt) {
   for (const t of state.floatingTexts) {
     t.ttl -= dt;
@@ -228,7 +374,6 @@ function updateFloatingTexts(dt) {
   }
   state.floatingTexts = state.floatingTexts.filter((t) => t.ttl > 0);
 }
-
 function drawFloatingTexts() {
   ctx.save();
   ctx.font = 'bold 22px Arial';
@@ -246,7 +391,7 @@ const intersects = (a, b) => a.x < b.x + b.width && a.x + a.width > b.x && a.y <
 
 function updateHeartsUI() {
   const active = '<span class="heart heart-active">❤</span>'.repeat(state.hearts);
-  const lost = '<span class="heart heart-lost">❤</span>'.repeat(Math.max(0, 3 - state.hearts));
+  const lost = '<span class="heart heart-lost">❤</span>'.repeat(Math.max(0, state.maxHearts - state.hearts));
   heartsEl.innerHTML = active + lost;
 }
 
@@ -274,8 +419,7 @@ async function kill(reason) {
   state.running = false;
   state.dead = true;
   state.deadReason = reason;
-
-  finalScoreEl.textContent = `Final Score: ${state.score}`;
+  finalScoreEl.textContent = `Final Score: ${state.score} • ${reason}`;
   await populateLeaderboard();
   deathScreenEl.classList.remove('hidden');
 }
@@ -293,6 +437,11 @@ function isOverWater(player) {
   return waterGaps.some((g) => centerX >= g.x && centerX <= g.x + g.width);
 }
 
+function isOverLava(player) {
+  const centerX = player.x + player.width / 2;
+  return lavaPuddles.some((l) => centerX >= l.x && centerX <= l.x + l.width);
+}
+
 function updateAnts(dt) {
   const p = state.player;
   const prevBottom = p.y + p.height - p.vy * dt;
@@ -301,7 +450,7 @@ function updateAnts(dt) {
     if (!ant.alive) continue;
     ant.x += ant.vx * dt;
     if (ant.x < 200) ant.vx = Math.abs(ant.vx);
-    if (ant.x > worldWidth - 200) ant.vx = -Math.abs(ant.vx);
+    if (ant.x > 5100) ant.vx = -Math.abs(ant.vx);
 
     if (intersects(p, ant)) {
       const playerBottom = p.y + p.height;
@@ -319,30 +468,65 @@ function updateAnts(dt) {
   }
 }
 
-const PTERODACTYL_LANES = [
-  // low lane: standing dino collides, ducking dino should pass underneath
-  { y: groundY - 80, height: 28 }
-];
+function updateCactus() {
+  const p = state.player;
+  for (const c of cacti) {
+    const hitbox = { x: c.x, y: groundY - c.height, width: c.width, height: c.height };
+    if (intersects(p, hitbox)) applyHit('Cactus spike!');
+  }
+}
+
+function updateMonkeys(dt) {
+  const p = state.player;
+  for (const m of state.monkeys) {
+    m.x += m.vx * dt;
+    if (m.x < m.range[0]) m.vx = Math.abs(m.vx);
+    if (m.x > m.range[1]) m.vx = -Math.abs(m.vx);
+
+    if (intersects(p, m) && !p.ducking) {
+      applyHit('Monkey swing! Duck under them.');
+    }
+  }
+}
+
+function updateSabertooths(dt) {
+  const p = state.player;
+  for (const s of state.sabertooths) {
+    s.x += s.vx * dt;
+    if (s.x < s.range[0]) s.vx = Math.abs(s.vx);
+    if (s.x > s.range[1]) s.vx = -Math.abs(s.vx);
+    if (intersects(p, s)) applyHit('Sabertooth tiger attack!');
+  }
+}
+
+function updateMammoths() {
+  const p = state.player;
+  for (const m of state.mammoths) {
+    const body = { x: m.x, y: groundY - 130, width: m.width, height: 70 };
+    const leftLeg = { x: m.x + 14, y: groundY - 60, width: 24, height: 60 };
+    const rightLeg = { x: m.x + m.width - 38, y: groundY - 60, width: 24, height: 60 };
+    if (intersects(p, body) || intersects(p, leftLeg) || intersects(p, rightLeg)) {
+      if (!p.ducking) {
+        applyHit('Mammoth stomp! Duck through the legs.');
+      }
+    }
+  }
+}
+
+const PTERODACTYL_LANES = [{ y: groundY - 80, height: 28 }];
 
 function getPterodactylHitbox(flyer) {
-  return {
-    x: flyer.x + 8,
-    y: flyer.y + 6,
-    width: flyer.width - 16,
-    height: flyer.height - 12
-  };
+  return { x: flyer.x + 8, y: flyer.y + 6, width: flyer.width - 16, height: flyer.height - 12 };
 }
 
 function getPlayerHitboxForAirHazards(player) {
   const widthInset = player.ducking ? 8 : 6;
   const topInset = player.ducking ? 8 : 4;
-  const bottomInset = 2;
-
   return {
     x: player.x + widthInset,
     y: player.y + topInset,
     width: player.width - widthInset * 2,
-    height: player.height - topInset - bottomInset
+    height: player.height - topInset - 2
   };
 }
 
@@ -351,16 +535,11 @@ function updatePterodactyls(dt) {
   state.pteroSpawnTimer -= dt;
 
   if (state.pteroSpawnTimer <= 0) {
-    const lane = PTERODACTYL_LANES[Math.floor(Math.random() * PTERODACTYL_LANES.length)];
-    state.pterodactyls.push({
-      x: state.cameraX + canvas.width + 80,
-      y: lane.y,
-      width: 54,
-      height: lane.height,
-      vx: -280
-    });
+    const lane = PTERODACTYL_LANES[0];
+    const speedMul = DIFFICULTY[gameConfig.difficulty].hazardSpeed;
+    state.pterodactyls.push({ x: state.cameraX + canvas.width + 80, y: lane.y, width: 54, height: lane.height, vx: -280 * speedMul });
     playSfx('ptero_spawn');
-    state.pteroSpawnTimer = 2.2;
+    state.pteroSpawnTimer = DIFFICULTY[gameConfig.difficulty].pteroSpawn;
   }
 
   const p = state.player;
@@ -378,20 +557,18 @@ function updateMeteors(dt) {
 
   if (state.meteorSpawnTimer <= 0) {
     const spawnX = state.cameraX + 80 + Math.random() * (canvas.width - 160);
-    state.meteors.push({ x: spawnX, y: -30, width: 24, height: 30, vy: 420, landed: false });
+    state.meteors.push({ x: spawnX, y: -30, width: 24, height: 30, vy: 420 * DIFFICULTY[gameConfig.difficulty].hazardSpeed, landed: false });
     playSfx('meteor_spawn');
-    state.meteorSpawnTimer = 1.5;
+    state.meteorSpawnTimer = DIFFICULTY[gameConfig.difficulty].meteorSpawn;
   }
 
   const p = state.player;
   for (const m of state.meteors) {
     m.y += m.vy * dt;
-
     if (!m.landed && m.y + m.height >= groundY) {
       m.landed = true;
       playSfx('meteor_land');
     }
-
     if (intersects(p, m)) {
       applyHit('Meteor strike!');
       m.y = canvas.height + 100;
@@ -409,6 +586,7 @@ function updatePlayer(dt) {
   const wasDucking = p.ducking;
   p.ducking = keys.has('ArrowDown') && p.onGround;
   if (!wasDucking && p.ducking) playSfx('duck');
+
   const targetHeight = p.ducking ? p.duckHeight : p.standingHeight;
   if (targetHeight !== p.height) {
     p.y += p.height - targetHeight;
@@ -436,6 +614,7 @@ function updatePlayer(dt) {
     p.vy = 0;
     p.onGround = true;
     if (isOverWater(p)) kill('SPLASH! Water is instant death.');
+    if (isOverLava(p)) kill('LAVA! Instant death.');
   } else {
     p.onGround = false;
   }
@@ -451,6 +630,10 @@ function tick(ts) {
     state.hitCooldown = Math.max(0, state.hitCooldown - dt);
     updatePlayer(dt);
     updateAnts(dt);
+    updateCactus();
+    updateMonkeys(dt);
+    updateSabertooths(dt);
+    updateMammoths();
     updatePterodactyls(dt);
     updateMeteors(dt);
     updateFloatingTexts(dt);
@@ -459,6 +642,9 @@ function tick(ts) {
   ctx.clearRect(0, 0, canvas.width, canvas.height);
   drawBackground();
   drawAnts();
+  drawMonkeys();
+  drawSabertooths();
+  drawMammoths();
   drawPterodactyls();
   drawMeteors();
   drawFloatingTexts();
diff --git a/styles.css b/styles.css
index 18e9cec..635fb36 100644
--- a/styles.css
+++ b/styles.css
@@ -25,7 +25,8 @@ body {
   border: 2px solid #1b3a47;
   background: #b5ecff;
 }
-#deathScreen {
+#deathScreen,
+#startScreen {
   position: fixed;
   inset: 0;
   background: rgba(0,0,0,0.65);
@@ -40,10 +41,29 @@ body {
   width: min(92vw, 460px);
 }
 .hidden { display: none !important; }
-button, input {
+button, input, select {
   font-size: 16px;
   padding: 8px 10px;
   margin-top: 8px;
+  width: 100%;
+}
+label {
+  display: block;
+  margin-top: 10px;
+  font-weight: 700;
+}
+.inline-option {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+.inline-option input {
+  width: auto;
+  margin: 0;
+}
+.error {
+  color: #c62828;
+  min-height: 20px;
 }
 ol { padding-left: 22px; }
 
@@ -51,5 +71,5 @@ ol { padding-left: 22px; }
   display: inline-block;
   margin-right: 2px;
 }
-.heart-active { color: #e02424; }
+.heart-active { color: #f2c94c; }
 .heart-lost { color: #111; }