diff --git a/src/App.jsx b/src/App.jsx
index 13cfa98..94861e0 100644
--- a/src/App.jsx
+++ b/src/App.jsx
@@ -59,20 +59,23 @@ export default function App({ onSwitchToGame }) {
   }, []);
 
   // Find port-dot element at pointer position (including nearby)
-  const findPortAtPoint = (x, y) => {
-    // First try exact hit
-    const el = document.elementFromPoint(x, y);
-    if (el && el.classList.contains('port-dot') && el.dataset.moduleId) {
-      return el;
-    }
-    // Try a small radius around the point
-    for (const [dx, dy] of [[0,0],[-8,0],[8,0],[0,-8],[0,8],[-6,-6],[6,-6],[-6,6],[6,6]]) {
-      const hit = document.elementFromPoint(x + dx, y + dy);
-      if (hit && hit.classList.contains('port-dot') && hit.dataset.moduleId) {
-        return hit;
+  // Robust port detection — searches all port-dots by bounding rect distance
+  // instead of elementFromPoint (which gets blocked by SVG wire overlay)
+  const findPortAtPoint = (clientX, clientY) => {
+    const portDots = document.querySelectorAll('.port-dot[data-module-id]');
+    let closest = null;
+    let closestDist = 18;
+    for (const dot of portDots) {
+      const rect = dot.getBoundingClientRect();
+      const cx = rect.left + rect.width / 2;
+      const cy = rect.top + rect.height / 2;
+      const dist = Math.sqrt((clientX - cx) ** 2 + (clientY - cy) ** 2);
+      if (dist < closestDist) {
+        closestDist = dist;
+        closest = dot;
       }
     }
-    return null;
+    return closest;
   };
 
   // Canvas pointer events
diff --git a/src/game/LevelComplete.jsx b/src/game/LevelComplete.jsx
index d2a096c..f30214a 100644
--- a/src/game/LevelComplete.jsx
+++ b/src/game/LevelComplete.jsx
@@ -1,10 +1,9 @@
 import React, { useEffect, useState } from 'react';
 
-export default function LevelComplete({ stars, checks, levelTitle, onNext, onRetry, onMap, isLastLevel }) {
+export default function LevelComplete({ stars, checks, levelTitle, onNext, onRetry, onMap, isLastLevel, hintPenalty }) {
   const [showStars, setShowStars] = useState(0);
 
   useEffect(() => {
-    // Animate stars appearing one by one
     const timers = [];
     for (let i = 1; i <= stars; i++) {
       timers.push(setTimeout(() => setShowStars(i), i * 400));
@@ -13,9 +12,9 @@ export default function LevelComplete({ stars, checks, levelTitle, onNext, onRet
   }, [stars]);
 
   const messages = [
-    '', // 0 stars
+    '',
     'Has dado el primer paso...',
-    'Buen trabajo — casi perfecto.',
+    hintPenalty ? 'Reinicia sin pista para conseguir 3 estrellas.' : 'Buen trabajo — casi perfecto.',
     'Ejecucion impecable.',
   ];
 
@@ -27,21 +26,25 @@ export default function LevelComplete({ stars, checks, levelTitle, onNext, onRet
         </h2>
         <p className="gm-complete-level">{levelTitle}</p>
 
-        {/* Stars */}
         <div className="gm-complete-stars">
           {[1, 2, 3].map(i => (
             <span
               key={i}
-              className={`gm-big-star ${i <= showStars ? 'earned' : 'empty'}`}
+              className={`gm-big-star ${i <= showStars ? 'earned' : 'empty'} ${i === 3 && hintPenalty ? 'locked' : ''}`}
             >
-              ★
+              {i === 3 && hintPenalty ? '🔒' : '★'}
             </span>
           ))}
         </div>
 
         <p className="gm-complete-msg">{messages[stars] || ''}</p>
 
-        {/* Checks */}
+        {hintPenalty && (
+          <p className="gm-hint-penalty-msg">
+            Usaste la pista — tercera estrella bloqueada
+          </p>
+        )}
+
         <div className="gm-checks">
           {checks.map((check, i) => (
             <div key={i} className={`gm-check ${check.passed ? 'passed' : 'failed'}`}>
@@ -52,10 +55,11 @@ export default function LevelComplete({ stars, checks, levelTitle, onNext, onRet
           ))}
         </div>
 
-        {/* Actions */}
         <div className="gm-complete-actions">
           <button className="gm-btn secondary" onClick={onMap}>Mapa</button>
-          <button className="gm-btn secondary" onClick={onRetry}>Reintentar</button>
+          <button className="gm-btn secondary" onClick={onRetry}>
+            {hintPenalty ? '↺ Sin pista' : 'Reintentar'}
+          </button>
           {stars >= 1 && !isLastLevel && (
             <button className="gm-btn primary" onClick={onNext}>Siguiente →</button>
           )}
diff --git a/src/game/PuzzleView.jsx b/src/game/PuzzleView.jsx
index 5f89ef5..590265d 100644
--- a/src/game/PuzzleView.jsx
+++ b/src/game/PuzzleView.jsx
@@ -14,17 +14,16 @@ export default function PuzzleView({ level, levelIndex, worldLevels, onBack, onN
   const portPositions = useRef({});
   const [tempWire, setTempWire] = useState(null);
   const connectingRef = useRef(null);
-  const [showConcept, setShowConcept] = useState(true);
-  const [result, setResult] = useState(null); // { stars, checks }
+  const [hintUsed, setHintUsed] = useState(false);
+  const [showHint, setShowHint] = useState(false);
+  const [result, setResult] = useState(null);
   const [targetPlaying, setTargetPlaying] = useState(false);
 
-  // Subscribe to state changes
   useEffect(() => {
     const unsub = subscribe(() => forceUpdate(n => n + 1));
     return unsub;
   }, []);
 
-  // Load level on mount
   useEffect(() => {
     loadLevel();
     return () => {
@@ -34,31 +33,25 @@ export default function PuzzleView({ level, levelIndex, worldLevels, onBack, onN
   }, [level.id]);
 
   const loadLevel = useCallback(() => {
-    // Clear state and load preplaced modules
     const data = {
       modules: (level.preplacedModules || []).map(m => ({
-        id: m.id,
-        type: m.type,
-        x: m.x,
-        y: m.y,
-        params: { ...m.params },
+        id: m.id, type: m.type, x: m.x, y: m.y, params: { ...m.params },
       })),
       connections: [],
       camera: { camX: 0, camY: 0, zoom: 1 },
     };
     deserialize(data);
     setResult(null);
-    setShowConcept(true);
+    setHintUsed(false);
+    setShowHint(false);
     if (state.isRunning) stopAudio();
   }, [level]);
 
-  // Port position reporting
   const handlePortPosition = useCallback((moduleId, portName, direction, el) => {
     const key = `${moduleId}-${portName}-${direction}`;
     portPositions.current[key] = el;
   }, []);
 
-  // Start connecting wire
   const handleStartConnect = useCallback((info) => {
     connectingRef.current = info;
     const containerRect = containerRef.current.getBoundingClientRect();
@@ -71,14 +64,23 @@ export default function PuzzleView({ level, levelIndex, worldLevels, onBack, onN
     });
   }, []);
 
-  const findPortAtPoint = (x, y) => {
-    for (const [dx, dy] of [[0,0],[-8,0],[8,0],[0,-8],[0,8],[-6,-6],[6,-6],[-6,6],[6,6]]) {
-      const hit = document.elementFromPoint(x + dx, y + dy);
-      if (hit && hit.classList.contains('port-dot') && hit.dataset.moduleId) {
-        return hit;
+  // Robust port detection — searches all port-dots by bounding rect distance
+  // instead of elementFromPoint (which gets blocked by SVG wire overlay)
+  const findPortAtPoint = (clientX, clientY) => {
+    const portDots = document.querySelectorAll('.port-dot[data-module-id]');
+    let closest = null;
+    let closestDist = 18;
+    for (const dot of portDots) {
+      const rect = dot.getBoundingClientRect();
+      const cx = rect.left + rect.width / 2;
+      const cy = rect.top + rect.height / 2;
+      const dist = Math.sqrt((clientX - cx) ** 2 + (clientY - cy) ** 2);
+      if (dist < closestDist) {
+        closestDist = dist;
+        closest = dot;
       }
     }
-    return null;
+    return closest;
   };
 
   const handlePointerDown = useCallback((e) => {
@@ -166,7 +168,6 @@ export default function PuzzleView({ level, levelIndex, worldLevels, onBack, onN
 
   const handleContextMenu = useCallback((e) => e.preventDefault(), []);
 
-  // Add module from palette
   const handleAddModule = (type) => {
     const x = (-state.camX + 250) / state.zoom + Math.random() * 30;
     const y = (-state.camY + 150) / state.zoom + Math.random() * 30;
@@ -174,7 +175,6 @@ export default function PuzzleView({ level, levelIndex, worldLevels, onBack, onN
     if (state.isRunning) rebuildGraph();
   };
 
-  // Toggle player audio
   const handleToggleAudio = async () => {
     if (state.isRunning) {
       stopAudio();
@@ -184,7 +184,6 @@ export default function PuzzleView({ level, levelIndex, worldLevels, onBack, onN
     emit();
   };
 
-  // Play target sound
   const handlePlayTarget = async () => {
     if (isTargetPlaying()) {
       stopTarget();
@@ -192,12 +191,16 @@ export default function PuzzleView({ level, levelIndex, worldLevels, onBack, onN
     } else {
       setTargetPlaying(true);
       await playTarget(level.target);
-      // Auto-update when target stops
       setTimeout(() => setTargetPlaying(false), (level.target.duration || 2) * 1000 + 100);
     }
   };
 
-  // Validate solution
+  // Reveal hint — permanently caps this attempt at 2 stars
+  const handleRevealHint = () => {
+    setHintUsed(true);
+    setShowHint(true);
+  };
+
   const handleCheck = () => {
     const mods = state.modules;
     const conns = state.connections;
@@ -206,14 +209,16 @@ export default function PuzzleView({ level, levelIndex, worldLevels, onBack, onN
       passed: check.test(mods, conns),
     }));
 
-    // Stars: sequential — need all previous stars to earn next
     let stars = 0;
     for (const check of checks) {
       if (check.passed) stars = check.star;
       else break;
     }
 
-    setResult({ stars, checks });
+    // Cap at 2 stars if hint was used
+    if (hintUsed && stars > 2) stars = 2;
+
+    setResult({ stars, checks, hintPenalty: hintUsed && stars >= 2 });
 
     if (stars >= 1) {
       completeLevel(level.id, stars);
@@ -251,20 +256,33 @@ export default function PuzzleView({ level, levelIndex, worldLevels, onBack, onN
       </div>
 
       <div className="gm-puzzle-content">
-        {/* Left sidebar: concept + module palette */}
+        {/* Left sidebar */}
         <div className="gm-puzzle-sidebar">
-          {/* Concept panel */}
+          {/* Description — always visible */}
           <div className="gm-concept-panel">
-            <div className="gm-concept-header" onClick={() => setShowConcept(!showConcept)}>
-              <span>💡 Concepto</span>
-              <span>{showConcept ? '▼' : '▶'}</span>
+            <div className="gm-concept-header">
+              <span>📖 Mision</span>
             </div>
-            {showConcept && (
-              <div className="gm-concept-body">
-                <p className="gm-concept-desc">{level.description}</p>
-                <div className="gm-concept-tip">
-                  <strong>Pista:</strong> {level.concept}
+            <div className="gm-concept-body">
+              <p className="gm-concept-desc">{level.description}</p>
+            </div>
+          </div>
+
+          {/* Hint — hidden, reveals with penalty */}
+          <div className="gm-hint-panel">
+            {!showHint ? (
+              <button className="gm-hint-btn" onClick={handleRevealHint}>
+                <span className="gm-hint-icon">💡</span>
+                <span className="gm-hint-label">Mostrar Pista</span>
+                <span className="gm-hint-penalty">max ★★</span>
+              </button>
+            ) : (
+              <div className="gm-hint-revealed">
+                <div className="gm-hint-header">
+                  <span>💡 Pista</span>
+                  <span className="gm-hint-penalty-tag">max ★★</span>
                 </div>
+                <p className="gm-hint-text">{level.concept}</p>
               </div>
             )}
           </div>
@@ -274,18 +292,27 @@ export default function PuzzleView({ level, levelIndex, worldLevels, onBack, onN
             <div className="gm-obj-title">Objetivos</div>
             {level.checks.map((check, i) => {
               const passed = result?.checks?.[i]?.passed;
+              const cappedByStar = hintUsed && check.star === 3;
               return (
-                <div key={i} className={`gm-obj ${passed === true ? 'passed' : passed === false ? 'failed' : ''}`}>
+                <div key={i} className={`gm-obj ${passed === true ? (cappedByStar ? 'capped' : 'passed') : passed === false ? 'failed' : ''}`}>
                   <span className="gm-obj-star">{'★'.repeat(check.star)}</span>
-                  <span className="gm-obj-name">{check.desc}</span>
-                  {passed === true && <span className="gm-obj-check">✓</span>}
+                  <span className="gm-obj-name">
+                    {check.desc}
+                    {cappedByStar && <span className="gm-obj-locked"> 🔒</span>}
+                  </span>
+                  {passed === true && !cappedByStar && <span className="gm-obj-check">✓</span>}
                   {passed === false && <span className="gm-obj-x">✗</span>}
                 </div>
               );
             })}
+            {hintUsed && (
+              <div className="gm-hint-warning">
+                Pista usada — maximo 2 estrellas. Reinicia para intentar sin pista.
+              </div>
+            )}
           </div>
 
-          {/* Module palette for this level */}
+          {/* Module palette */}
           {level.availableModules.length > 0 && (
             <div className="gm-module-palette">
               <div className="gm-palette-title">Modulos Disponibles</div>
@@ -293,11 +320,7 @@ export default function PuzzleView({ level, levelIndex, worldLevels, onBack, onN
                 const def = getModuleDef(type);
                 if (!def) return null;
                 return (
-                  <div
-                    key={type}
-                    className="gm-palette-item"
-                    onClick={() => handleAddModule(type)}
-                  >
+                  <div key={type} className="gm-palette-item" onClick={() => handleAddModule(type)}>
                     <span className="gm-palette-icon">{def.icon}</span>
                     <span className="gm-palette-name">{def.name}</span>
                     <span className="gm-palette-add">+</span>
@@ -307,7 +330,6 @@ export default function PuzzleView({ level, levelIndex, worldLevels, onBack, onN
             </div>
           )}
 
-          {/* Reset button */}
           <button className="gm-btn danger" onClick={loadLevel} style={{ marginTop: 'auto' }}>
             ↺ Reiniciar Nivel
           </button>
@@ -324,7 +346,6 @@ export default function PuzzleView({ level, levelIndex, worldLevels, onBack, onN
             onWheel={handleWheel}
             onContextMenu={handleContextMenu}
           >
-            {/* Grid */}
             <svg style={{ position: 'absolute', inset: 0, width: '100%', height: '100%', zIndex: 0 }}>
               <defs>
                 <pattern id="puzzle-grid" width={20 * state.zoom} height={20 * state.zoom}
@@ -336,10 +357,8 @@ export default function PuzzleView({ level, levelIndex, worldLevels, onBack, onN
               <rect width="100%" height="100%" fill="url(#puzzle-grid)" />
             </svg>
 
-            {/* Wires */}
             <WireLayer portPositions={portPositions} tempWire={tempWire} containerRef={containerRef} zoom={state.zoom} camX={state.camX} camY={state.camY} />
 
-            {/* Modules */}
             <div style={{ position: 'absolute', left: state.camX, top: state.camY, zIndex: 2 }}>
               {state.modules.map(mod => (
                 <ModuleNode
@@ -353,7 +372,6 @@ export default function PuzzleView({ level, levelIndex, worldLevels, onBack, onN
             </div>
           </div>
 
-          {/* Canvas hints */}
           {state.modules.length > 0 && state.connections.length === 0 && (
             <div className="gm-canvas-hint">
               Arrastra de un puerto (circulo) a otro para conectar modulos
@@ -369,6 +387,7 @@ export default function PuzzleView({ level, levelIndex, worldLevels, onBack, onN
           checks={result.checks}
           levelTitle={level.title}
           isLastLevel={isLastLevel}
+          hintPenalty={result.hintPenalty}
           onRetry={loadLevel}
           onMap={onBack}
           onNext={onNextLevel}
diff --git a/src/index.css b/src/index.css
index 4947795..2dc1449 100644
--- a/src/index.css
+++ b/src/index.css
@@ -421,6 +421,54 @@ html, body, #root {
 .gm-obj.failed .gm-obj-name { color: var(--text2); }
 .gm-obj-check { color: var(--green); font-weight: 700; }
 .gm-obj-x { color: var(--red); font-weight: 700; }
+.gm-obj.capped .gm-obj-name { color: var(--text2); text-decoration: line-through; }
+.gm-obj-locked { color: var(--text2); font-size: 10px; }
+
+.gm-hint-warning {
+  margin-top: 8px; padding: 6px 8px; background: rgba(255,204,0,0.08);
+  border-radius: 4px; font-size: 10px; color: var(--yellow); line-height: 1.4;
+}
+
+/* Hint panel */
+.gm-hint-panel { }
+.gm-hint-btn {
+  width: 100%; display: flex; align-items: center; gap: 8px;
+  padding: 10px 12px; border: 1px dashed var(--yellow); border-radius: 8px;
+  background: rgba(255,204,0,0.04); cursor: pointer;
+  font-family: inherit; transition: all 0.15s;
+}
+.gm-hint-btn:hover { background: rgba(255,204,0,0.1); border-style: solid; }
+.gm-hint-icon { font-size: 16px; }
+.gm-hint-label { font-size: 12px; font-weight: 600; color: var(--yellow); flex: 1; text-align: left; }
+.gm-hint-penalty {
+  font-size: 9px; color: var(--red); background: rgba(255,68,102,0.15);
+  padding: 2px 6px; border-radius: 3px; font-weight: 700;
+}
+
+.gm-hint-revealed {
+  background: var(--surface); border: 1px solid var(--yellow); border-radius: 8px;
+  overflow: hidden;
+}
+.gm-hint-header {
+  padding: 8px 12px; display: flex; justify-content: space-between; align-items: center;
+  font-size: 12px; font-weight: 600; color: var(--yellow);
+  background: rgba(255,204,0,0.06);
+}
+.gm-hint-penalty-tag {
+  font-size: 9px; color: var(--red); background: rgba(255,68,102,0.15);
+  padding: 2px 6px; border-radius: 3px; font-weight: 700;
+}
+.gm-hint-text {
+  padding: 8px 12px 12px; font-size: 11px; color: var(--text); line-height: 1.5;
+}
+
+.gm-hint-penalty-msg {
+  font-size: 11px; color: var(--yellow); margin-bottom: 16px;
+}
+
+.gm-big-star.locked {
+  color: var(--border); font-size: 36px;
+}
 
 /* Module palette (game) */
 .gm-module-palette {