diff --git a/__tests__/content/series.test.ts b/__tests__/content/series.test.ts
index 287d8e63a..120badfa5 100644
--- a/__tests__/content/series.test.ts
+++ b/__tests__/content/series.test.ts
@@ -21,7 +21,7 @@ describe('content/series/', async () => {
       markdownString.match(/^-{3}(.+)-{3}$/ms)![1]
     ) as Software
 
-    test('has valid MDC syntax', () => {
+    test('has valid syntax', () => {
       expect(mdcContent).toBeDefined()
 
       expect(mdcContent).toHaveProperty('slug', slug)
@@ -55,5 +55,22 @@ describe('content/series/', async () => {
     test('.seriesList.json has property', () => {
       expect(Object.keys(seriesList)).toContain(slug)
     })
+
+    test('uses Chart component correctly', () => {
+      const chartComponents = markdownString.matchAll(
+        /:charts\{:difficulties="difficulties" levels="(.+?)" charts="(.+?)"\}/g
+      )
+      for (const component of chartComponents) {
+        const testName = `Match[${component.index}] (${component[0]})`
+        const levels = component[1].split(',')
+        const charts = component[2].split(',')
+        expect(charts, testName).toHaveLength(levels.length)
+        for (const chart of charts) {
+          expect(Object.keys(mdcContent.difficulties), testName).toContain(
+            chart
+          )
+        }
+      }
+    })
   })
 })
diff --git a/content/series/ext-us.md b/content/series/ext-us.md
index 6b48a8b3a..c1113ebd4 100644
--- a/content/series/ext-us.md
+++ b/content/series/ext-us.md
@@ -65,7 +65,7 @@ difficulties:
 |[MOBO★MOGA](/songs/mobo-moga)|Orange Lounge|172|:charts{:difficulties="difficulties" levels="1,3,6,7" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="3,6,7" charts="1,2,3"}|
 |[Move Your Feet](/songs/move-your-feet)|Junior Senior|118|:charts{:difficulties="difficulties" levels="1,3,5,7" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,7" charts="1,2,3"}|
 |[Music (Bostik Radio Edit)](/songs/music-bostik)|Darude|138|:charts{:difficulties="difficulties" levels="1,4,6,8" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="2,6,7" charts="1,2,3"}|
-|[NEVER ENDING STORY (Power Club Vocal Mix)](/songs/never-ending-story)|DJ-AC-DC|140|:charts{:difficulties="difficulties" levels="1,4,6,7" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,7,8" charts="1,2,3"}|
+|[NEVER ENDING STORY (Power Club Vocal Mix)](/songs/never-ending-story)|DJ-AC-DC|140|:charts{:difficulties="difficulties" levels="1,4,6,7" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="3,7,8" charts="1,2,3"}|
 |[ON THE JAZZ](/songs/on-the-jazz)|Jonny Dynamite!|130|:charts{:difficulties="difficulties" levels="1,2,5,7" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,7" charts="1,2,3"}|
 |[ONLY YOU](/songs/only-you)|CAPTAIN JACK|93|:charts{:difficulties="difficulties" levels="1,3,4,7" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="3,6,7" charts="1,2,3"}|
 |[PARANOiA ETERNAL](/songs/paranoia-eternal)|STM 200|200|:charts{:difficulties="difficulties" levels="2,5,6,9" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="5,6,9" charts="1,2,3"}|
diff --git a/content/series/ext2.md b/content/series/ext2.md
index 4f50907af..d4ddf63a8 100644
--- a/content/series/ext2.md
+++ b/content/series/ext2.md
@@ -25,7 +25,7 @@ difficulties:
 |[As The Rush Comes (Gabriel & Dresden Sweeping Strings Radio Edit)](/songs/as-the-rush-comes)|Motorcycle|136|:charts{:difficulties="difficulties" levels="1,5,6,8" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="5,6,7" charts="1,2,3"}|
 |[Block Rockin' Beats](/songs/block-rockin-beats)|Chemical Brothers|110|:charts{:difficulties="difficulties" levels="1,3,6,8" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="3,6,8" charts="1,2,3"}|
 |[BOOM BOOM DOLLAR (K.O.G G3 MIX)](/songs/boom-boom-dollar-kogg)|King Kong & D. Jungle Girls|170|:charts{:difficulties="difficulties" levels="1,5,7,8" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="5,7,9" charts="1,2,3"}|
-|[butterfly (UPSWING MIX)](/songs/butterfly-upswing)|SMiLE.dk|170|:charts{:difficulties="difficulties" levels="1,4,6,8,9" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="5,7,8,9" charts="1,2,3"}|
+|[butterfly (UPSWING MIX)](/songs/butterfly-upswing)|SMiLE.dk|170|:charts{:difficulties="difficulties" levels="1,4,6,8,9" charts="0,1,2,3,4"}|:charts{:difficulties="difficulties" levels="5,7,8,9" charts="1,2,3,4"}|
 |[CAPTAIN JACK (GRANDALE REMIX)](/songs/captain-jack)|CAPTAIN JACK|170|:charts{:difficulties="difficulties" levels="1,4,7,9" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="5,7,9" charts="1,2,3"}|
 |[CARTOON HEROES (Speedy Mix)](/songs/cartoon-heroes)|BARBIE YOUNG|170|:charts{:difficulties="difficulties" levels="1,4,7,9" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="4,7,9" charts="1,2,3"}|
 |[Crazy In Love](/songs/crazy-in-love)|wg feat. Indra J|100|:charts{:difficulties="difficulties" levels="1,3,5,7" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,6" charts="1,2,3"}|
@@ -55,11 +55,11 @@ difficulties:
 |[Happy Wedding](/songs/happy-wedding)|ASKA|126|:charts{:difficulties="difficulties" levels="1,3,5,7" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,6" charts="1,2,3"}|
 |[Heaven is a '57 metallic gray (gimmix)](/songs/heaven-is-a-57-metallic-gray)|Hiro feat. Sweet little 30's|190|:charts{:difficulties="difficulties" levels="2,4,6,8" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="4,6,8" charts="1,2,3"}|
 |[I Need You (Insideout Door Mix)](/songs/i-need-you-insideout-door)|Supa Fova|65-130|:charts{:difficulties="difficulties" levels="1,4,5,7" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="3,7,7" charts="1,2,3"}|
-|[INFINITE PRAYER](/songs/infinite-prayer)|L.E.D. LIGHT feat. Goro|137|:charts{:difficulties="difficulties" levels="1,2,6,7,9" charts="0,1,2,3,9"}|:charts{:difficulties="difficulties" levels="2,6,7" charts="1,2,3"}|
+|[INFINITE PRAYER](/songs/infinite-prayer)|L.E.D. LIGHT feat. Goro|137|:charts{:difficulties="difficulties" levels="1,2,6,7,9" charts="0,1,2,3,4"}|:charts{:difficulties="difficulties" levels="2,6,7" charts="1,2,3"}|
 |[INJECTION OF LOVE (HINA MIX)](/songs/injection-of-love-hina)|AKIRA YAMAOKA|160|:charts{:difficulties="difficulties" levels="1,4,6,7" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="4,6,7" charts="1,2,3"}|
-|[INSERTiON (Machine Gun Kelly Mix)](/songs/insertion-machine-gun-kelly)|Thuggie D.|69-139|:charts{:difficulties="difficulties" levels="1,3,5,7" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="3,6,7" charts="6,7,8"}|
+|[INSERTiON (Machine Gun Kelly Mix)](/songs/insertion-machine-gun-kelly)|Thuggie D.|69-139|:charts{:difficulties="difficulties" levels="1,3,5,7" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="3,6,7" charts="1,2,3"}|
 |[INSIDE YOUR HEART](/songs/inside-your-heart)|AKIRA YAMAOKA|107|:charts{:difficulties="difficulties" levels="1,3,5,6" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,7" charts="1,2,3"}|
-|[KEEP ON MOVIN' (DMX Mix)](/songs/keep-on-movin-dmx)|N.M.R.-typeG|132|:charts{:difficulties="difficulties" levels="1,3,5,7,8" charts="0,1,2,3,13"}|:charts{:difficulties="difficulties" levels="4,5,7" charts="6,7,8"}|
+|[KEEP ON MOVIN' (DMX Mix)](/songs/keep-on-movin-dmx)|N.M.R.-typeG|132|:charts{:difficulties="difficulties" levels="1,3,5,7,8" charts="0,1,2,3,4"}|:charts{:difficulties="difficulties" levels="4,5,7" charts="1,2,3"}|
 |[La Bamba](/songs/la-bamba)|Mexican Folk Song|179|:charts{:difficulties="difficulties" levels="1,3,5,8" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="4,5,8" charts="1,2,3"}|
 |[L'amour et la liberte (DDR ver.)](/songs/l-amour-et-la-liberte)|NAOKI underground|145|:charts{:difficulties="difficulties" levels="1,4,6,8" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="4,6,7" charts="1,2,3"}|
 |[LOVE IS ORANGE](/songs/love-is-orange)|Orange Lounge|180|:charts{:difficulties="difficulties" levels="2,4,6,7,8" charts="0,1,2,3,4"}|:charts{:difficulties="difficulties" levels="5,6,7,8" charts="1,2,3,4"}|
@@ -68,9 +68,9 @@ difficulties:
 |[Miracle Moon (L.E.D.LIGHT STYLE MIX)](/songs/miracle-moon)|Togo Project feat. Sana|138|:charts{:difficulties="difficulties" levels="1,3,5,7" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="2,5,7" charts="1,2,3"}|
 |[PASSION OF LOVE](/songs/passion-of-love)|NAOKI feat. PAULA TERRY|78-155|:charts{:difficulties="difficulties" levels="1,4,6,7" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="5,6,7" charts="1,2,3"}|
 |[Polovtsian Dances And Chorus](/songs/polovtsian-dances-and-chorus)|Naoto Suzuki feat. Martha|146|:charts{:difficulties="difficulties" levels="1,4,6,8" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="4,6,8" charts="1,2,3"}|
-|[Quickening](/songs/quickening)|dj TAKA|150|:charts{:difficulties="difficulties" levels="1,3,5,6,8" charts="0,1,2,3,9"}|:charts{:difficulties="difficulties" levels="3,5,7" charts="1,2,3"}|
+|[Quickening](/songs/quickening)|dj TAKA|150|:charts{:difficulties="difficulties" levels="1,3,5,6,8" charts="0,1,2,3,4"}|:charts{:difficulties="difficulties" levels="3,5,7" charts="1,2,3"}|
 |[SAKURA](/songs/sakura)|RevenG|14-300|:charts{:difficulties="difficulties" levels="3,5,8,10,9" charts="0,1,2,3,4"}|:charts{:difficulties="difficulties" levels="6,8,10,9" charts="1,2,3,4"}|
-|[SANA MOLLETE NE ENTE (B.L.T. STYLE)](/songs/sana-mollete-ne-ente-blt)|Togo Project feat. Sana|90-180|:charts{:difficulties="difficulties" levels="2,2,5,7,8" charts="0,1,7,3,9"}|:charts{:difficulties="difficulties" levels="2,5,8" charts="1,2,3"}|
+|[SANA MOLLETE NE ENTE (B.L.T. STYLE)](/songs/sana-mollete-ne-ente-blt)|Togo Project feat. Sana|90-180|:charts{:difficulties="difficulties" levels="2,2,5,7,8" charts="0,1,2,3,4"}|:charts{:difficulties="difficulties" levels="2,5,8" charts="1,2,3"}|
 |[Saturday Night Love](/songs/saturday-night-love)|Sota feat. Brenda V.|128|:charts{:difficulties="difficulties" levels="1,3,5,6" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,6" charts="1,2,3"}|
 |[SEDUCTION](/songs/seduction)|nc ft. FINALFORCE|95-190|:charts{:difficulties="difficulties" levels="2,5,7,8" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="5,7,8" charts="1,2,3"}|
 |[SEXY PLANET](/songs/sexy-planet)|Crystal Aliens|180|:charts{:difficulties="difficulties" levels="2,5,6,7" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="4,5,7" charts="1,2,3"}|
diff --git a/content/series/festival.md b/content/series/festival.md
index ff5dc4cd3..c45be2b59 100644
--- a/content/series/festival.md
+++ b/content/series/festival.md
@@ -64,23 +64,23 @@ difficulties:
 |[BATTLE BREAKS](/songs/battle-breaks)|DJ TAKAWO|112|:charts{:difficulties="difficulties" levels="3,6,7" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,7" charts="1,2,3"}|
 |[FIRE DUB](/songs/fire-dub)|ASLETICS|85|:charts{:difficulties="difficulties" levels="3,5,8" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="4,5,7" charts="1,2,3"}|
 |[GET IT ALL](/songs/get-it-all)|BRASS TRICKS|140|:charts{:difficulties="difficulties" levels="4,7,8" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="4,5,8" charts="1,2,3"}|
-|[GORGEOUS 2012](/songs/gorgeous-2012)|THE SURRENDERS|135|:charts{:difficulties="difficulties" levels="3,6,7" charts="6,7,8"}|:charts{:difficulties="difficulties" levels="3,5,7" charts="6,7,8"}|
+|[GORGEOUS 2012](/songs/gorgeous-2012)|THE SURRENDERS|135|:charts{:difficulties="difficulties" levels="3,6,7" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,7" charts="1,2,3"}|
 |[I Need You -True Platinum Mix](/songs/i-need-you-true-platinum)|Sho-T|130|:charts{:difficulties="difficulties" levels="1,4,5,6" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="3,6,7" charts="1,2,3"}|
 |[In My Eyes](/songs/in-my-eyes)|riewo|142|:charts{:difficulties="difficulties" levels="3,7,8" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="4,5,6" charts="1,2,3"}|
-|[INFINITE PRAYER](/songs/infinite-prayer)|L.E.D. LIGHT feat. Goro|137|:charts{:difficulties="difficulties" levels="2,6,9" charts="1,2,9"}|:charts{:difficulties="difficulties" levels="2,6,7" charts="1,2,3"}|
+|[INFINITE PRAYER](/songs/infinite-prayer)|L.E.D. LIGHT feat. Goro|137|:charts{:difficulties="difficulties" levels="2,6,9" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="2,6,7" charts="1,2,3"}|
 |[INFINITE PRAYER -floating flock style-](/songs/infinite-prayer-floating-flock)|L.E.D. feat. GORO|120|:charts{:difficulties="difficulties" levels="3,6,8" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,6,8" charts="1,2,3"}|
-|[INSERTiON (Machine Gun Kelly Mix)](/songs/insertion-machine-gun-kelly)|Thuggie D.|69-139|:charts{:difficulties="difficulties" levels="3,5,7" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,6,7" charts="6,7,8"}|
-|[KEEP ON MOVIN' (DMX Mix)](/songs/keep-on-movin-dmx)|N.M.R.-typeG|132|:charts{:difficulties="difficulties" levels="3,5,8" charts="1,2,8"}|:charts{:difficulties="difficulties" levels="4,5,7" charts="6,7,8"}|
+|[INSERTiON (Machine Gun Kelly Mix)](/songs/insertion-machine-gun-kelly)|Thuggie D.|69-139|:charts{:difficulties="difficulties" levels="3,5,7" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,6,7" charts="1,2,3"}|
+|[KEEP ON MOVIN' (DMX Mix)](/songs/keep-on-movin-dmx)|N.M.R.-typeG|132|:charts{:difficulties="difficulties" levels="3,5,8" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="4,5,7" charts="1,2,3"}|
 |[Keep Ya Body Movin'](/songs/keep-ya-body-movin)|Thuggie D.|95|:charts{:difficulties="difficulties" levels="2,3,5" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,4,6" charts="1,2,3"}|
 |[MAD BLAST](/songs/mad-blast)|THE INFECTION|180|:charts{:difficulties="difficulties" levels="4,6,10" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="4,7,9" charts="1,2,3"}|
-|[MATSURI (J-SUMMER MIX)](/songs/matsuri-j-summer)|RE-VENGE|180|:charts{:difficulties="difficulties" levels="4,5,9" charts="1,2,8"}|:charts{:difficulties="difficulties" levels="4,6,8" charts="6,7,8"}|
+|[MATSURI (J-SUMMER MIX)](/songs/matsuri-j-summer)|RE-VENGE|180|:charts{:difficulties="difficulties" levels="4,5,9" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="4,6,8" charts="1,2,3"}|
 |[MEANING OF LIFE](/songs/meaning-of-life)|K. Wit feat. GARY|112|:charts{:difficulties="difficulties" levels="3,6,7" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,4,6" charts="1,2,3"}|
 |[MGS2 mission R](/songs/mgs2-mission-r)|L.E.D.|150|:charts{:difficulties="difficulties" levels="4,5,9" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="4,6,8" charts="1,2,3"}|
 |[Mind Parasite](/songs/mind-parasite)|TOMOSUKE|145|:charts{:difficulties="difficulties" levels="3,6,8" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,6,8" charts="1,2,3"}|
 |[NEMESIS](/songs/nemesis)|D.J. SETUP|164|:charts{:difficulties="difficulties" levels="4,6,8" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="4,6,8" charts="1,2,3"}|
-|[PUT YOUR FAITH IN ME (SATURDAY NIGHT MIX)](/songs/put-your-faith-in-me-saturday-night)|UZI-LAY|120|:charts{:difficulties="difficulties" levels="3,6,7" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,6" charts="6,7,8"}|
-|[Quickening](/songs/quickening)|dj TAKA|150|:charts{:difficulties="difficulties" levels="3,5,8" charts="1,2,9"}|:charts{:difficulties="difficulties" levels="3,5,7" charts="1,2,3"}|
-|[SANA MOLLETE NE ENTE (B.L.T. STYLE)](/songs/sana-mollete-ne-ente-blt)|Togo Project feat. Sana|90-180|:charts{:difficulties="difficulties" levels="2,7,8" charts="1,2,9"}|:charts{:difficulties="difficulties" levels="2,5,8" charts="1,2,3"}|
+|[PUT YOUR FAITH IN ME (SATURDAY NIGHT MIX)](/songs/put-your-faith-in-me-saturday-night)|UZI-LAY|120|:charts{:difficulties="difficulties" levels="3,6,7" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,6" charts="1,2,3"}|
+|[Quickening](/songs/quickening)|dj TAKA|150|:charts{:difficulties="difficulties" levels="3,5,8" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,7" charts="1,2,3"}|
+|[SANA MOLLETE NE ENTE (B.L.T. STYLE)](/songs/sana-mollete-ne-ente-blt)|Togo Project feat. Sana|90-180|:charts{:difficulties="difficulties" levels="2,7,8" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="2,5,8" charts="1,2,3"}|
 |[SOMETHING WONDERFUL](/songs/something-wonderful)|L.E.D.|150|:charts{:difficulties="difficulties" levels="3,5,8" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="4,5,8" charts="1,2,3"}|
 |[There 4 You](/songs/there-4-you)|Thuggie D.|113|:charts{:difficulties="difficulties" levels="3,5,6" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,7" charts="1,2,3"}|
 |[What is Love?](/songs/what-is-love)|TOMOSUKE|130|:charts{:difficulties="difficulties" levels="3,6,7" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,7" charts="1,2,3"}|
diff --git a/content/series/max-jp.md b/content/series/max-jp.md
index 42571ebae..ed870999e 100644
--- a/content/series/max-jp.md
+++ b/content/series/max-jp.md
@@ -61,8 +61,8 @@ difficulties:
 |[CANDY☆](/songs/candy-star)|Luv UNLIMITED|192|:charts{:difficulties="difficulties" levels="?,?,?" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="?,?,?" charts="1,2,3"}|
 |[MAX 300](/songs/max-300)|Ω|300|:charts{:difficulties="difficulties" levels="?,?,?" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="?,?,?" charts="1,2,3"}|
 |[true... (Trance Sunrise Mix)](/songs/true-trance)|小坂りゆ|140|:charts{:difficulties="difficulties" levels="?,?,?" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="?,?,?" charts="1,2,3"}|
-|[Kind Lady](/songs/kind-lady)|OKUYATOS|135|:charts{:difficulties="difficulties" levels="?,?,?" charts="1,2,6"}|:charts{:difficulties="difficulties" levels="?,?,?" charts="1,2,3"}|
-|[SO IN LOVE](/songs/so-in-love)|Caramel.S|112|:charts{:difficulties="difficulties" levels="?,?,?" charts="1,2,8"}|:charts{:difficulties="difficulties" levels="?,?,?" charts="1,2,3"}|
+|[Kind Lady](/songs/kind-lady)|OKUYATOS|135|:charts{:difficulties="difficulties" levels="?,?,?" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="?,?,?" charts="1,2,3"}|
+|[SO IN LOVE](/songs/so-in-love)|Caramel.S|112|:charts{:difficulties="difficulties" levels="?,?,?" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="?,?,?" charts="1,2,3"}|
 
 ## システム概要
 
diff --git a/content/series/max-us.md b/content/series/max-us.md
index 638dece38..b96eeb7e4 100644
--- a/content/series/max-us.md
+++ b/content/series/max-us.md
@@ -74,13 +74,13 @@ difficulties:
 |[Jam & Marmalade](/songs/jam-marmalade)|Final Offset|145|:charts{:difficulties="difficulties" levels="3,5,8" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="4,6,7" charts="1,2,3"}|
 |[Let the beat hit em! (BM IIDX version)](/songs/let-the-beat-hit-em-bm)|Stone Bros.|110|:charts{:difficulties="difficulties" levels="3,6,7" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,7" charts="1,2,3"}|
 |[Look To The Sky (True Color Mix)](/songs/look-to-the-sky-true-color)|System S.F. feat. Anna|140|:charts{:difficulties="difficulties" levels="4,5,7" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,7" charts="1,2,3"}|
-|[SO IN LOVE](/songs/so-in-love)|Caramel.S|112|:charts{:difficulties="difficulties" levels="3,6,7" charts="1,2,6"}|:charts{:difficulties="difficulties" levels="4,6,7" charts="1,2,3"}|
+|[SO IN LOVE](/songs/so-in-love)|Caramel.S|112|:charts{:difficulties="difficulties" levels="3,6,7" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="4,6,7" charts="1,2,3"}|
 |[true... (Trance Sunrise Mix)](/songs/true-trance)|RIYU KOSAKA|140|:charts{:difficulties="difficulties" levels="3,5,8" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,6,8" charts="1,2,3"}|
 |[celebrate](/songs/celebrate)|JJ COMPANY|134|:charts{:difficulties="difficulties" levels="4,5,8" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,8,8" charts="1,2,5"}|
 |[Do It Right (Harmonized 2Step Mix)](/songs/do-it-right-harmonized-2step)|SOTA feat. Ebony Fay|135|:charts{:difficulties="difficulties" levels="4,6,7" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,7" charts="1,2,3"}|
 |[Get me in your sight \~AMD CANCUN MIX\~](/songs/get-me-in-your-sight)|SYMPHONIC DEFOGGERS with 1479|127|:charts{:difficulties="difficulties" levels="3,6,8" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,4,7" charts="1,2,3"}|
 |[Healing Vision](/songs/healing-vision)|DE-SIRE|49-196|:charts{:difficulties="difficulties" levels="3,6,8" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,6,9" charts="1,2,3"}|
-|[Kind Lady](/songs/kind-lady)|OKUYATOS|135|:charts{:difficulties="difficulties" levels="4,6,7" charts="1,2,6"}|:charts{:difficulties="difficulties" levels="4,5,8" charts="1,2,3"}|
+|[Kind Lady](/songs/kind-lady)|OKUYATOS|135|:charts{:difficulties="difficulties" levels="4,6,7" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="4,5,8" charts="1,2,3"}|
 |[LOGICAL DASH](/songs/logical-dash)|dj TAKA|144|:charts{:difficulties="difficulties" levels="3,6,8" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,7" charts="1,2,3"}|
 |[Holic](/songs/holic)|TaQ|155|:charts{:difficulties="difficulties" levels="4,6,8" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="4,6,8" charts="1,2,3"}|
 |[MY SUMMER LOVE](/songs/my-summer-love)|mitsu-O! with GEILA|100|:charts{:difficulties="difficulties" levels="3,6,9" charts="1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,8" charts="1,2,3"}|
diff --git a/content/series/party.md b/content/series/party.md
index 5a6c89867..434301276 100644
--- a/content/series/party.md
+++ b/content/series/party.md
@@ -31,7 +31,7 @@ difficulties:
 |[GET UP'N MOVE](/songs/get-up-n-move)|S&K|132|:charts{:difficulties="difficulties" levels="1,5,7,8" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="6,7,7" charts="1,2,3"}|
 |[I believe in miracles](/songs/i-believe-in-miracles)|HI-RISE|126|:charts{:difficulties="difficulties" levels="1,5,6,8" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="6,7,8" charts="1,2,3"}|
 |[IF YOU WERE HERE](/songs/if-you-were-here)|JENNIFER|146|:charts{:difficulties="difficulties" levels="1,5,6,7" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="6,7,7" charts="1,2,3"}|
-|[LET'S GET DOWN](/songs/lets-get-down)|JT PLAYAZ|128|:charts{:difficulties="difficulties" levels="1,3,4,5,8" charts="0,1,2,3,4"}|:charts{:difficulties="difficulties" levels="3,4,7,7" charts="1,2,3"}|
+|[LET'S GET DOWN](/songs/lets-get-down)|JT PLAYAZ|128|:charts{:difficulties="difficulties" levels="1,3,4,5,8" charts="0,1,2,3,4"}|:charts{:difficulties="difficulties" levels="3,4,7,7" charts="1,2,3,4"}|
 |[MOONLIGHT SHADOW (New Vocal Version)](/songs/moonlight-shadow)|MISSING HEART|140|:charts{:difficulties="difficulties" levels="1,4,5,6" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="4,5,7" charts="1,2,3"}|
 |[RHYTHM AND POLICE (K.O.G G3 Mix)](/songs/rhythm-and-police)|CJ CREW feat. CHRISTIAN D|170|:charts{:difficulties="difficulties" levels="1,4,6,9" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="4,7,9" charts="1,2,3"}|
 |[SKY HIGH](/songs/sky-high-miko)|DJ MIKO|136|:charts{:difficulties="difficulties" levels="1,2,4,7" charts="0,1,2,3"}|:charts{:difficulties="difficulties" levels="3,5,7" charts="1,2,3"}|