diff --git a/content/challenges/100.md b/content/challenges/100.md
deleted file mode 100644
index 7bb9248..0000000
--- a/content/challenges/100.md
+++ /dev/null
@@ -1,110 +0,0 @@
----
-japanese:
-  - - - pos: particle
-        text: ながら
-        dictionary: 乍ら
-      - pos: particle
-        text: の
-      - pos: noun
-        text:
-          - 優: ゆう
-          - 等: とう
-          - 生: せい
-      - dictionary: ~
-        text: "　"
-      - pos: noun
-        text:
-          - 今: こ
-          - 宵: よい
-      - pos: particle
-        text: も
-      - pos: noun
-        text:
-          - 自: じ
-          - 分: ぶん
-      - pos: particle
-        text: と
-      - pos: noun
-        text:
-          - 密: みっ
-          - 会: かい
-      - pos: verb
-        text: です
-  - - - pos: adjective
-        text: しんどい
-      - pos: particle
-        text: わ
-      - dictionary: ~
-        text: "　"
-      - pos: adjective
-        text: しんどい
-      - pos: particle
-        text: わ
-      - dictionary: ~
-        text: "　"
-      - pos: phrase
-        text: あー
-        dictionary: 嗚呼
-      - pos: adverb
-        text: つらつら
-        dictionary: 倩々
-      - pos: noun
-        text:
-          - 合: がっ
-          - 掌: しょう
-  - - - pos: noun
-        text: ほんと
-        dictionary: 本当
-      - pos: particle
-        text: は
-      - pos: noun
-        text:
-          - 劣: れっ
-          - 等: とう
-          - 生: せい
-      - dictionary: ~
-        text: "　"
-      - pos: noun
-        text: あたし
-        dictionary: 私-1
-      - pos: particle
-        text: に
-      - pos: noun
-        text:
-          - 説: しっ
-          - 教: きょう
-      - pos: verb
-        text: です
-  - - - pos: adjective
-        text: しんどい
-      - pos: particle
-        text: わ
-      - dictionary: ~
-        text: "　"
-      - pos: adjective
-        text: しんどい
-      - pos: particle
-        text: わ
-      - dictionary: ~
-        text: "　"
-      - pos: adverb
-        text: もー
-        dictionary: もう
-      - pos: adverb
-        text: いやいや
-        dictionary: 嫌々
-      - pos: noun
-        text:
-          - 絶: ぜっ
-          - 交: こう
-english:
-  - Part-time patrician, another clandestine rendezvous with myself 
-  - Drained, oh so drained, introspection and in prayer
-  - But really a plebeian, preach to me myself and I 
-  - Drained, oh so drained, I guess we need to break up 
-date: 2023-02-21
----
-
-This week's challenge is from デビルじゃないもん/*(Not) A Devil*'s lyrics ([YouTube](https://www.youtube.com/watch?v=lMEt3RdqB9Y)):
-
-{{< youtube lMEt3RdqB9Y >}}
diff --git a/content/challenges/30.md b/content/challenges/30.md
index fa26679..7291bd0 100644
--- a/content/challenges/30.md
+++ b/content/challenges/30.md
@@ -48,6 +48,6 @@ english:
 date: 2021-09-07
 ---
 
-This week's challenge is from [浴]{よく}[槽]{そう}とネオンテトラ's lyrics ([YouTube](https://www.youtube.com/watch?v=NrfLlgv02hs)):
+This week's challenge is from [浴]{よく}[槽]{そう}とネオンテトラ's lyrics ([YouTube](https://www.youtube.com/watch?v=xlU8pUQ7mn8)):
 
-{{< youtube NrfLlgv02hs >}}
+{{< youtube xlU8pUQ7mn8 >}}
\ No newline at end of file
diff --git a/content/challenges/84.md b/content/challenges/84.md
index d94ed4c..e1687b4 100644
--- a/content/challenges/84.md
+++ b/content/challenges/84.md
@@ -160,6 +160,6 @@ japanese:
 date: 2022-11-08
 ---
 
-This week's challenge is from the lyrics of Clannad's だんご[大]{だい}[家]{か}[族]{ぞく} ([YouTube](https://www.youtube.com/watch?v=kAImtagQL_I)):
+This week's challenge is from the lyrics of Clannad's だんご[大]{だい}[家]{か}[族]{ぞく} ([YouTube](https://www.youtube.com/watch?v=0NF1lPiMXkY)):
 
-{{< youtube kAImtagQL_I >}}
+{{< youtube 0NF1lPiMXkY >}}