diff --git a/book/default/00_asset.md b/book/default/00_asset.md
index 959b083..ef9812f 100644
--- a/book/default/00_asset.md
+++ b/book/default/00_asset.md
@@ -11,6 +11,7 @@
 |name|body|
 |---|---|
 |[game animation sample](https://dev.epicgames.com/documentation/en-us/unreal-engine/game-animation-sample-project-in-unreal-engine)|キャラクターをパルクールアクション|
+|[stack o bot](https://www.fab.com/ja/listings/b4dfff49-0e7d-4c4b-a6c5-8a0315831c9c)|ジャンプゲーム、ステージ|
 |[city sample](https://www.unrealengine.com/marketplace/ja/product/city-sample)|大規模な都市を構築|
 |[control rig sample](https://www.fab.com/ja/listings/2ce3fe44-9ee6-4fa7-99fc-b9424a402386)|人間以外のキャラクター|
 |[content examples](https://www.fab.com/ja/listings/4d251261-d98c-48e2-baee-8f4e47c67091)|機能別サンプル|
diff --git a/book/default/README.md b/book/default/README.md
index 39c90f4..f82d721 100644
--- a/book/default/README.md
+++ b/book/default/README.md
@@ -52,7 +52,7 @@ $ npm install -g @anthropic-ai/claude-code
 `https://www.youtube.com/embed/${id}?start=0&end=10&mute=1&rel=0&showinfo=0&controls=0`
 
 ```html
-<iframe width="100%" height="415" src="https://www.youtube.com/embed/?start=0&end=10&mute=1&rel=0&showinfo=0&controls=0" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
+<iframe width="100%" height="415" src="https://www.youtube.com/embed/?rel=0&showinfo=0&controls=0" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
 ```
 
 ### blueprint