diff --git a/README.md b/README.md
index d08107867c2..7095a36cfc7 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,7 @@ Check out our [Trello Board](https://trello.com/b/z10B703R/pokerogue-board) to s
     - Arata Iiyoshi
     - Atsuhiro Ishizuna
   - Pokémon Black/White 2
+  - Firel (Additional biome themes)
   - edifette (Title screen music)
 
 ### 🎵 Sound Effects
diff --git a/public/audio/bgm/laboratory.mp3 b/public/audio/bgm/laboratory.mp3
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diff --git a/public/audio/bgm/metropolis.mp3 b/public/audio/bgm/metropolis.mp3
index 3300317d650..ff67771bdb9 100644
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diff --git a/public/images/arenas/island_a.png b/public/images/arenas/island_a.png
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index 00000000000..e48675aa59b
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diff --git a/public/images/arenas/island_b.png b/public/images/arenas/island_b.png
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index 00000000000..53bd4f1fe4c
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diff --git a/public/images/arenas/island_b_1.png b/public/images/arenas/island_b_1.png
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index 00000000000..8619e406a3f
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diff --git a/public/images/arenas/island_b_2.png b/public/images/arenas/island_b_2.png
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index 00000000000..b6dfa077346
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diff --git a/public/images/arenas/island_b_3.png b/public/images/arenas/island_b_3.png
new file mode 100644
index 00000000000..192c06950ae
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diff --git a/public/images/arenas/island_bg.png b/public/images/arenas/island_bg.png
new file mode 100644
index 00000000000..5ecb6d8100d
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diff --git a/public/images/arenas/jungle_a.png b/public/images/arenas/jungle_a.png
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index 00000000000..5501593d9e1
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diff --git a/public/images/arenas/jungle_b.png b/public/images/arenas/jungle_b.png
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index 00000000000..29ec524298c
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diff --git a/public/images/arenas/jungle_b_1.png b/public/images/arenas/jungle_b_1.png
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index 00000000000..462bd0df264
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diff --git a/public/images/arenas/jungle_b_2.png b/public/images/arenas/jungle_b_2.png
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index 00000000000..1a395af55ae
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diff --git a/public/images/arenas/jungle_b_3.png b/public/images/arenas/jungle_b_3.png
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index 00000000000..e579f4013ce
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diff --git a/public/images/arenas/jungle_bg.png b/public/images/arenas/jungle_bg.png
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diff --git a/public/images/arenas/laboratory_a.png b/public/images/arenas/laboratory_a.png
index c9875ae407b..628a6919ebb 100644
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diff --git a/public/images/arenas/laboratory_b.png b/public/images/arenas/laboratory_b.png
index 3cd2832268f..eabd398bada 100644
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diff --git a/public/images/arenas/laboratory_b_1.png b/public/images/arenas/laboratory_b_1.png
index f9f7567a178..b3ee7875943 100644
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index 90954be71e7..99b23e95a1f 100644
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diff --git a/public/images/arenas/laboratory_bg.png b/public/images/arenas/laboratory_bg.png
index d94de95a0aa..331e15f8db7 100644
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diff --git a/public/images/arenas/metropolis_a.png b/public/images/arenas/metropolis_a.png
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index 00000000000..5a51c500702
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diff --git a/public/images/arenas/metropolis_b.png b/public/images/arenas/metropolis_b.png
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index 00000000000..638899f3e53
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index 00000000000..6e543b4c55e
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diff --git a/public/images/arenas/metropolis_b_2.png b/public/images/arenas/metropolis_b_2.png
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index 00000000000..bc609ddb300
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diff --git a/public/images/arenas/metropolis_bg.png b/public/images/arenas/metropolis_bg.png
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index 00000000000..b84c5aa494d
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diff --git a/public/images/arenas/snowy_forest_a.png b/public/images/arenas/snowy_forest_a.png
index 7fcc26245b0..c44abbbce51 100644
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index 88025db58b8..e4ae9f4b180 100644
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diff --git a/public/images/arenas/snowy_forest_b_1.png b/public/images/arenas/snowy_forest_b_1.png
new file mode 100644
index 00000000000..f47f4f91508
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diff --git a/public/images/arenas/snowy_forest_b_2.png b/public/images/arenas/snowy_forest_b_2.png
new file mode 100644
index 00000000000..5bc27fc5161
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diff --git a/public/images/arenas/snowy_forest_b_3.png b/public/images/arenas/snowy_forest_b_3.png
new file mode 100644
index 00000000000..521870232de
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diff --git a/public/images/arenas/snowy_forest_bg.png b/public/images/arenas/snowy_forest_bg.png
index bfe7545c9e9..c449ddb32ee 100644
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diff --git a/src/field/arena.ts b/src/field/arena.ts
index 5101ffd29eb..46b16eed8d3 100644
--- a/src/field/arena.ts
+++ b/src/field/arena.ts
@@ -582,7 +582,7 @@ export class Arena {
       case Biome.TALL_GRASS:
         return 9.608;
       case Biome.METROPOLIS:
-        return 4.867;
+        return 141.470;
       case Biome.FOREST:
         return 4.294;
       case Biome.SEA:
@@ -636,7 +636,7 @@ export class Arena {
       case Biome.ISLAND:
         return 2.751;
       case Biome.LABORATORY:
-        return 0.797;
+        return 114.862;
       case Biome.SLUM:
         return 1.221;
       case Biome.SNOWY_FOREST:
@@ -646,19 +646,12 @@ export class Arena {
 }
 
 export function getBiomeKey(biome: Biome): string {
-  switch (biome) {
-    case Biome.METROPOLIS:
-      return 'slum';
-    case Biome.JUNGLE:
-      return 'tall_grass';
-    case Biome.ISLAND:
-      return 'beach';
-  }
   return Biome[biome].toLowerCase();
 }
 
 export function getBiomeHasProps(biomeType: Biome): boolean {
   switch (biomeType) {
+    case Biome.METROPOLIS:
     case Biome.BEACH:
     case Biome.LAKE:
     case Biome.SEABED:
@@ -676,8 +669,11 @@ export function getBiomeHasProps(biomeType: Biome): boolean {
     case Biome.WASTELAND:
     case Biome.ABYSS:
     case Biome.CONSTRUCTION_SITE:
+    case Biome.JUNGLE:
     case Biome.FAIRY_CAVE:
     case Biome.TEMPLE:
+    case Biome.SNOWY_FOREST:
+    case Biome.ISLAND:
     case Biome.LABORATORY:
     case Biome.END:
       return true;