diff --git a/app/lib/icemake.ts b/app/lib/icemake.ts
index 5d34187..dc0811d 100644
--- a/app/lib/icemake.ts
+++ b/app/lib/icemake.ts
@@ -72,9 +72,6 @@ function runGraphExecution(
   const visited: Map<number, Set<string>> = new Map();
   let currentId: number | null = firstComponentId;
 
-  const coneColors: ConeColor[] = ["red", "yellow", "brown"];
-  const flavors: Flavor[] = ["vanilla", "chocolate", "strawberry"];
-
   while (currentId !== null) {
     const component: Component | undefined = components[currentId];
     const node: ComponentGraphNode | undefined = graph[currentId];
@@ -136,7 +133,11 @@ function runGraphExecution(
         branchTaken = condition;
       }
 
-      steps.push({ componentIndex: currentId, stack: [...stack], branchTaken });
+      steps.push({
+        componentIndex: currentId,
+        stack: stack === null ? null : [...stack],
+        branchTaken,
+      });
 
       if (children == null) break;
 
@@ -151,4 +152,4 @@ function runGraphExecution(
   }
 
   return steps;
-}
+}
\ No newline at end of file
diff --git a/app/routes/home.tsx b/app/routes/home.tsx
index 86ba063..d802349 100644
--- a/app/routes/home.tsx
+++ b/app/routes/home.tsx
@@ -49,11 +49,11 @@ function renderIceCream(spec: IceCreamSpec, index: number) {
 }
 
 const iceCreams : IceCreamSpec[] = [
-  { x: "24px", y: "calc(100% - 100px)", cone: "red", scoops: ["vanilla", "chocolate", "chocolate","strawberry", "strawberry"] },
+  { x: "10%", y: "calc(100% - 100px)", cone: "red", scoops: ["vanilla", "chocolate", "chocolate","strawberry", "strawberry"] },
   { x: "25%", y: "calc(100% - 100px)", cone: "brown", scoops: ["strawberry", "vanilla", "chocolate"] },
   { x: "50%", y: "calc(100% - 100px)", cone: "yellow", scoops: ["chocolate"] },
   { x: "75%", y: "calc(100% - 100px)", cone: "red", scoops: ["chocolate", "strawberry", "vanilla"] },
-  { x: "calc(100% - 100px)", y: "calc(100% - 100px)", cone: "brown", scoops: ["strawberry", "strawberry", "chocolate", "vanilla", "strawberry"] },
+  { x: "90%", y: "calc(100% - 100px)", cone: "brown", scoops: ["strawberry", "strawberry", "chocolate", "vanilla", "strawberry"] },
 ];
 
 export function meta({}: Route.MetaArgs) {
diff --git a/app/routes/howToPlay.tsx b/app/routes/howToPlay.tsx
index 59881cf..b6aff66 100644
--- a/app/routes/howToPlay.tsx
+++ b/app/routes/howToPlay.tsx
@@ -63,7 +63,7 @@ export default function HowToPlay() {
             この<ruby>画<rt>が</rt></ruby><ruby>面<rt>めん</rt></ruby>には、プレイに<ruby>必<rt>ひつ</rt></ruby><ruby>要<rt>よう</rt></ruby>なさまざまな<ruby>情<rt>じょう</rt></ruby><ruby>報<rt>ほう</rt></ruby>が<ruby>表<rt>ひょう</rt></ruby><ruby>示<rt>じ</rt></ruby>されています。
           </p>
           <p className="mb-3 text-gray-700">
-            <ruby>左<rt>ひだり</rt></ruby><ruby>上<rt>うえ</rt></ruby>には、そのステージのミッション（<ruby>作<rt>つく</rt></ruby>りたいアイスクリーム）が<ruby>書<rt>か</rt></ruby>かれています。
+            <ruby>左<rt>ひだり</rt></ruby><ruby>上<rt>うえ</rt></ruby>には、そのステージの番号やミッション（<ruby>作<rt>つく</rt></ruby>りたいアイスクリーム）が<ruby>書<rt>か</rt></ruby>かれています。
             このミッションを<ruby>達<rt>たっ</rt></ruby><ruby>成<rt>せい</rt></ruby>できるよう、<ruby>人々<rt>ひとびと</rt></ruby>を<ruby>上手<rt>じょうず</rt></ruby>に<ruby>配<rt>はい</rt></ruby><ruby>置<rt>ち</rt></ruby>しましょう。
           </p>
           <div className="text-center mt-4">
@@ -80,6 +80,9 @@ export default function HowToPlay() {
           <p className="mb-3 text-gray-700">
             <ruby>画<rt>が</rt></ruby><ruby>面<rt>めん</rt></ruby><ruby>下<rt>した</rt></ruby>には、このステージで<ruby>作<rt>さ</rt></ruby><ruby>業<rt>ぎょう</rt></ruby>してくれる<ruby>人<rt>ひと</rt></ruby>たちが<ruby>並<rt>なら</rt></ruby>んでいます。
             <ruby>作<rt>さ</rt></ruby><ruby>業<rt>ぎょう</rt></ruby>に<ruby>参<rt>さん</rt></ruby><ruby>加<rt>か</rt></ruby>させたい<ruby>人<rt>ひと</rt></ruby>がいたら、ドラッグ＆ドロップで<ruby>好<rt>す</rt></ruby>きな<ruby>場<rt>ば</rt></ruby><ruby>所<rt>しょ</rt></ruby>に<ruby>配<rt>はい</rt></ruby><ruby>置<rt>ち</rt></ruby>できます。
+            <ruby>配<rt>はい</rt></ruby><ruby>置<rt>ち</rt></ruby>した<ruby>人<rt>ひと</rt></ruby><ruby>々<rt>びと</rt></ruby>は、その<ruby>下<rt>した</rt></ruby>にあるベルトコンベアを<ruby>別<rt>べつ</rt></ruby>の<ruby>人<rt>ひと</rt></ruby>やコーン<ruby>投<rt>とう</rt></ruby><ruby>入<rt>にゅう</rt></ruby><ruby>口<rt>ぐち</rt></ruby>と<ruby>繋<rt>つな</rt></ruby>げることで、アイスクリーム<ruby>作<rt>づく</rt></ruby>りを<ruby>手伝<rt>てつだ</rt></ruby>ってくれます。
+            ベルトコンベアの<ruby>端<rt>はし</rt></ruby>をクリックしたまま、<ruby>別<rt>べつ</rt></ruby>のベルトコンベアの<ruby>端<rt>はし</rt></ruby>まで<ruby>持<rt>も</rt></ruby>っていくことでつなげることができます。
+            <ruby>配<rt>はい</rt></ruby><ruby>置<rt>ち</rt></ruby>した<ruby>人<rt>ひと</rt></ruby><ruby>々<rt>びと</rt></ruby>や、つなげた<ruby>経路<rt>けいろ</rt></ruby>はホバーして出てくる×ボタンで<ruby>消<rt>け</rt></ruby>すことができます。
           </p>
           <div className="text-center mt-4">
             <img src="/stage_screen.png" alt="ステージ画面の説明" className="inline-block w-128 h-64 mx-2" />
@@ -95,6 +98,7 @@ export default function HowToPlay() {
           <p className="mb-3 text-gray-700">
             <ruby>右<rt>みぎ</rt></ruby><ruby>下<rt>した</rt></ruby>には「<ruby>実<rt>じっ</rt></ruby><ruby>行<rt>こう</rt></ruby>」ボタンがあります。
             <ruby>配<rt>はい</rt></ruby><ruby>置<rt>ち</rt></ruby>が<ruby>整<rt>ととの</rt></ruby>ったと<ruby>思<rt>おも</rt></ruby>ったら、このボタンを<ruby>押<rt>お</rt></ruby>してみましょう。<ruby>押<rt>お</rt></ruby>すと、さまざまな<ruby>色<rt>いろ</rt></ruby>のコーンが<ruby>流<rt>なが</rt></ruby>れてきます。
+            スピードを<ruby>変<rt>か</rt></ruby>えたいときは、<ruby>実行<rt>じっこう</rt></ruby>ボタンの<ruby>隣<rt>となり</rt></ruby>にあるボタンを<ruby>押<rt>お</rt></ruby>すことにより、<ruby>速<rt>はや</rt></ruby>くしたり<ruby>遅<rt>おそ</rt></ruby>くしたりできます。
           </p>
           <p className="mb-3 text-gray-700">
             お<ruby>題<rt>だい</rt></ruby>どおりのアイスを<ruby>作<rt>つく</rt></ruby>ることができれば<ruby>成<rt>せい</rt></ruby><ruby>功<rt>こう</rt></ruby>です。
@@ -192,8 +196,7 @@ export default function HowToPlay() {
               <ul className="mb-2 space-y-1 ml-4">
                 <li>・ Ⅰ：コーンの<ruby>色<rt>いろ</rt></ruby></li>
                 <li>・ Ⅱ：<ruby>載<rt>の</rt></ruby>っているアイスの<ruby>数<rt>かず</rt></ruby></li>
-                <li>・ Ⅲ：<ruby>一<rt>いち</rt></ruby><ruby>番<rt>ばん</rt></ruby><ruby>上<rt>うえ</rt></ruby>に<ruby>載<rt>の</rt></ruby>っているアイスの<ruby>種<rt>しゅ</rt></ruby><ruby>類<rt>るい</rt></ruby></li>
-                <li>・ Ⅳ：<ruby>特<rt>とく</rt></ruby><ruby>定<rt>てい</rt></ruby>のアイスの<ruby>並<rt>なら</rt></ruby>び<ruby>順<rt>じゅん</rt></ruby>の<ruby>有<rt>う</rt></ruby><ruby>無<rt>む</rt></ruby></li>
+                <li>・ Ⅲ：<ruby>特<rt>とく</rt></ruby><ruby>定<rt>てい</rt></ruby>のアイスの<ruby>並<rt>なら</rt></ruby>び<ruby>順<rt>じゅん</rt></ruby>の<ruby>有<rt>う</rt></ruby><ruby>無<rt>む</rt></ruby></li>
               </ul>
               <p>
                 それぞれの<ruby>条<rt>じょう</rt></ruby><ruby>件<rt>けん</rt></ruby>に<ruby>従<rt>したが</rt></ruby>って、コーンを<ruby>上<rt>じょう</rt></ruby><ruby>下<rt>げ</rt></ruby>どちらかの<ruby>経<rt>けい</rt></ruby><ruby>路<rt>ろ</rt></ruby>へ<ruby>流<rt>なが</rt></ruby>します。
@@ -219,13 +222,9 @@ export default function HowToPlay() {
                 この<ruby>人<rt>ひと</rt></ruby>たちは、<ruby>特<rt>とく</rt></ruby><ruby>定<rt>てい</rt></ruby>の<ruby>味<rt>あじ</rt></ruby>のアイスが<ruby>大<rt>だい</rt></ruby><ruby>好<rt>す</rt></ruby>きです。
                 その<ruby>味<rt>あじ</rt></ruby>のアイスが<ruby>一<rt>いち</rt></ruby><ruby>番<rt>ばん</rt></ruby><ruby>上<rt>うえ</rt></ruby>に<ruby>載<rt>の</rt></ruby>ったコーンが<ruby>流<rt>なが</rt></ruby>れてくると、<ruby>一<rt>いち</rt></ruby><ruby>番<rt>ばん</rt></ruby><ruby>上<rt>うえ</rt></ruby>のアイスを<ruby>食<rt>た</rt></ruby>べてしまいます。
               </p>
-              <p className="mb-2 font-semibold">ただし、</p>
-              <ul className="mb-2 space-y-1 ml-4">
-                <li>・ アイスが1つも<ruby>載<rt>の</rt></ruby>っていない</li>
-                <li>・ <ruby>一<rt>いち</rt></ruby><ruby>番<rt>ばん</rt></ruby><ruby>上<rt>うえ</rt></ruby>のアイスが<ruby>好<rt>す</rt></ruby>きな<ruby>味<rt>あじ</rt></ruby>ではない</li>
-              </ul>
-              <p>
-                といった<ruby>場<rt>ば</rt></ruby><ruby>合<rt>あい</rt></ruby>は、<ruby>何<rt>なに</rt></ruby>もしません。
+              <p className="mb-2 font-semibold">ただし、
+                <ruby>一<rt>いち</rt></ruby><ruby>番<rt>ばん</rt></ruby><ruby>上<rt>うえ</rt></ruby>のアイスが<ruby>好<rt>す</rt></ruby>きな<ruby>味<rt>あじ</rt></ruby>ではない<ruby>場<rt>ば</rt></ruby><ruby>合<rt>あい</rt></ruby>は、<ruby>何<rt>なに</rt></ruby>もしません。
+                しかし、アイスが1つも<ruby>載<rt>の</rt></ruby>っていないコーンが<ruby>流<rt>なが</rt></ruby>れてきたときは、コーンを<ruby>食<rt>た</rt></ruby>べてしまいます。
               </p>
               <p className="mb-2 font-semibold">
                 ※<ruby>黒<rt>くろ</rt></ruby>い<ruby>服<rt>ふく</rt></ruby>の人は、どんな<ruby>味<rt>あじ</rt></ruby>も<ruby>大<rt>だい</rt></ruby><ruby>好<rt>す</rt></ruby>きです！
diff --git a/app/stages.ts b/app/stages.ts
index c0f6078..9b11320 100644
--- a/app/stages.ts
+++ b/app/stages.ts
@@ -167,39 +167,9 @@ export const STAGES: Record<number, StageData> = {
   },
   13: {
     mission: {
-      red: [
-        "chocolate",
-        "vanilla",
-        "chocolate",
-        "vanilla",
-        "chocolate",
-        "vanilla",
-        "chocolate",
-        "vanilla",
-        "strawberry",
-      ],
-      yellow: [
-        "vanilla",
-        "vanilla",
-        "vanilla",
-        "vanilla",
-        "vanilla",
-        "vanilla",
-        "vanilla",
-        "strawberry",
-        "strawberry",
-      ],
-      brown: [
-        "vanilla",
-        "chocolate",
-        "vanilla",
-        "vanilla",
-        "chocolate",
-        "vanilla",
-        "vanilla",
-        "chocolate",
-        "vanilla",
-      ],
+      red: ["chocolate", "vanilla", "chocolate", "vanilla", "chocolate", "vanilla", "chocolate", "vanilla", "strawberry"],
+      yellow: ["vanilla", "vanilla", "vanilla", "vanilla", "vanilla", "vanilla", "vanilla", "strawberry", "strawberry"],
+      brown: ["vanilla", "chocolate", "vanilla", "vanilla", "chocolate", "vanilla", "vanilla", "chocolate", "vanilla",],
     },
     components: [
       { type: "if", condition: "red" },
@@ -342,98 +312,40 @@ export const STAGES: Record<number, StageData> = {
       { type: "if", condition: 5 },
     ],
   },
-  20: {
+20: {
     mission: {
-      red: [
-        "vanilla",
-        "strawberry",
-        "chocolate",
-        "vanilla",
-        "chocolate",
-        "strawberry",
-        "vanilla",
-        "chocolate",
-        "strawberry",
-      ],
-      yellow: [
-        "chocolate",
-        "vanilla",
-        "strawberry",
-        "chocolate",
-        "strawberry",
-        "vanilla",
-        "chocolate",
-        "strawberry",
-      ],
-      brown: [
-        "strawberry",
-        "chocolate",
-        "vanilla",
-        "chocolate",
-        "strawberry",
-        "vanilla",
-        "chocolate",
-        "strawberry",
-      ],
+      red: ["vanilla", "strawberry", "chocolate", "vanilla", "chocolate", "strawberry", "vanilla", "chocolate", "strawberry"],
+      yellow: ["chocolate", "vanilla", "strawberry", "chocolate", "strawberry", "vanilla", "chocolate", "strawberry"],
+      brown: ["strawberry", "chocolate", "vanilla", "chocolate", "strawberry", "vanilla", "chocolate", "strawberry"],
     },
     components: [
-      { type: "push", flavor: "vanilla" },
-      { type: "push", flavor: "chocolate" },
-      { type: "push", flavor: "strawberry" },
-      { type: "if", condition: "red" },
-      { type: "if", condition: "yellow" },
-      { type: "if", condition: 3 },
-      { type: "if", condition: 4 },
-      { type: "if", condition: 5 },
-      { type: "if", condition: 8 },
-    ],
+      {type: "push", flavor: "vanilla"},
+      {type: "push", flavor: "chocolate"},
+      {type: "push", flavor: "strawberry"},
+      {type: "if", condition: "red"},
+      {type: "if", condition: "yellow"},
+      {type: "if", condition: 3},
+      {type: "if", condition: 4},
+      {type: "if", condition: 5},
+      {type: "if", condition: 8},
+    ]
   },
   21: {
     mission: {
-      red: [
-        "vanilla",
-        "chocolate",
-        "strawberry",
-        "vanilla",
-        "chocolate",
-        "strawberry",
-        "chocolate",
-        "vanilla",
-      ],
-      yellow: [
-        "strawberry",
-        "vanilla",
-        "chocolate",
-        "strawberry",
-        "chocolate",
-        "vanilla",
-        "strawberry",
-        "chocolate",
-        "vanilla",
-      ],
-      brown: [
-        "vanilla",
-        "strawberry",
-        "vanilla",
-        "chocolate",
-        "strawberry",
-        "chocolate",
-        "vanilla",
-        "strawberry",
-        "chocolate",
-        "vanilla",
-      ],
+      red: ["vanilla", "chocolate", "strawberry", "vanilla", "chocolate", "strawberry", "chocolate", "vanilla"],
+      yellow: ["strawberry", "vanilla", "chocolate", "strawberry", "chocolate", "vanilla", "strawberry", "chocolate", "vanilla"],
+      brown: ["vanilla", "strawberry", "vanilla", "chocolate", "strawberry", "chocolate", "vanilla", "strawberry", "chocolate", "vanilla"],
     },
     components: [
-      { type: "push", flavor: "vanilla" },
-      { type: "push", flavor: "chocolate" },
-      { type: "push", flavor: "vanilla" },
-      { type: "push", flavor: "chocolate" },
-      { type: "push", flavor: "strawberry" },
-      { type: "if", condition: "red" },
-      { type: "if", condition: "yellow" },
-      { type: "if", condition: 4 },
-      { type: "if", condition: 8 },
-    ],
+      {type: "push", flavor: "vanilla"},
+      {type: "push", flavor: "chocolate"},
+      {type: "push", flavor: "vanilla"},
+      {type: "push", flavor: "chocolate"},
+      {type: "push", flavor: "strawberry"},
+      {type: "if", condition: "red"},
+      {type: "if", condition: "yellow"},
+      {type: "if", condition: 4},
+      {type: "if", condition: 8},
+    ]
   },
 };