diff --git a/project.godot b/project.godot
index 7a86978..ac520d3 100644
--- a/project.godot
+++ b/project.godot
@@ -4,7 +4,7 @@ config_version=5
 [application]
 config/name="DauphinCraft"
 config/description="Minecraft-like sous-marin — joue un dauphin"
-run/main_scene="res://scenes/Main.tscn"
+run/main_scene="res://scenes/MainMenu.tscn"
 config/features=PackedStringArray("4.6", "Forward Plus")
 config/icon="res://icon.svg"
 
diff --git a/scenes/Main.tscn b/scenes/Main.tscn
index 8193102..7f81f11 100644
--- a/scenes/Main.tscn
+++ b/scenes/Main.tscn
@@ -1,14 +1,29 @@
-[gd_scene load_steps=3 format=3]
+[gd_scene load_steps=6 format=3 uid="uid://dauphincraft_main"]
 
-[sub_resource type="SphereMesh" id="SphereMesh_1"]
+[ext_resource type="Script" path="res://scripts/Main.gd" id="1_mainscript"]
+[ext_resource type="Script" path="res://scripts/ambience/UnderwaterEnvironment.gd" id="2_uwenv"]
+[ext_resource type="PackedScene" path="res://scenes/World.tscn" id="3_world"]
+[ext_resource type="PackedScene" path="res://scenes/Dolphin.tscn" id="4_dolphin"]
+[ext_resource type="Script" path="res://scripts/ambience/PlanktonParticles.gd" id="5_plankton"]
 
 [node name="Main" type="Node3D"]
+script = ExtResource("1_mainscript")
 
-[node name="Camera3D" type="Camera3D" parent="."]
-transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 5)
+[node name="UnderwaterEnvironment" type="WorldEnvironment" parent="."]
+script = ExtResource("2_uwenv")
 
-[node name="DirectionalLight3D" type="DirectionalLight3D" parent="."]
-transform = Transform3D(1, 0, 0, 0, 0.707, 0.707, 0, -0.707, 0.707, 0, 3, 0)
+[node name="SunLight" type="DirectionalLight3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, 0.342, 0.940, 0, -0.940, 0.342, 0, 60, 0)
+light_color = Color(0.6, 0.85, 1.0, 1)
+light_energy = 1.2
+shadow_enabled = true
 
-[node name="Sphere" type="MeshInstance3D" parent="."]
-mesh = SubResource("SphereMesh_1")
+[node name="World" parent="." instance=ExtResource("3_world")]
+
+[node name="Dolphin" parent="." instance=ExtResource("4_dolphin")]
+position = Vector3(0, 55, 0)
+
+[node name="PlanktonFollower" type="Node3D" parent="."]
+
+[node name="PlanktonParticles" type="GPUParticles3D" parent="PlanktonFollower"]
+script = ExtResource("5_plankton")
diff --git a/scripts/Main.gd b/scripts/Main.gd
new file mode 100644
index 0000000..a45234e
--- /dev/null
+++ b/scripts/Main.gd
@@ -0,0 +1,42 @@
+extends Node3D
+
+@onready var world: Node3D = $World/ChunkManager
+@onready var dolphin: CharacterBody3D = $Dolphin
+@onready var hud: CanvasLayer = $Dolphin/HUD
+@onready var plankton_follower: Node3D = $PlanktonFollower
+
+
+func _ready() -> void:
+	dolphin.block_break_requested.connect(_on_block_break)
+	dolphin.block_place_requested.connect(_on_block_place)
+	dolphin.echolocation_triggered.connect(_on_echolocation)
+
+	if is_instance_valid(hud) and hud.has_method("connect_to_dolphin"):
+		hud.connect_to_dolphin(dolphin)
+
+	AudioManager.play_ambient_loop("underwater_ambient")
+	AudioManager.play_music("underwater_theme")
+	AudioManager.play_whale_call_random()
+
+	world.world_seed = 12345
+
+
+func _process(_delta: float) -> void:
+	world.update_player_position(dolphin.global_position)
+	plankton_follower.global_position = dolphin.global_position
+
+
+func _on_block_break(hit_position: Vector3, _normal: Vector3) -> void:
+	var broken_id := world.break_block(hit_position)
+	if broken_id > 0:
+		AudioManager.play_bubble_sfx(hit_position)
+
+
+func _on_block_place(hit_position: Vector3, normal: Vector3) -> void:
+	var place_pos := hit_position + normal * 0.5
+	var current_selected_block := 2
+	world.place_block(place_pos, current_selected_block)
+
+
+func _on_echolocation(position: Vector3, _radius: float) -> void:
+	AudioManager.play_bubble_sfx(position)