diff --git a/SQCSim-common/world.cpp b/SQCSim-common/world.cpp
index c18c32c..a803e01 100644
--- a/SQCSim-common/world.cpp
+++ b/SQCSim-common/world.cpp
@@ -16,6 +16,9 @@ void World::SetSeed(uint64_t seed) {
 	m_seed = seed;
 }
 
+
+
+
 Chunk* World::ChunkAt(float x, float y, float z) const {
 	int cx = (int)x / CHUNK_SIZE_X;
 	int cz = (int)z / CHUNK_SIZE_Z;
@@ -31,6 +34,24 @@ Chunk* World::ChunkAt(float x, float y, float z) const {
 
 Chunk* World::ChunkAt(const Vector3f& pos) const { return ChunkAt(pos.x, pos.y, pos.z); }
 
+void World::RemoveChunk(int nbReduit)
+{
+	for (int x = 0; x < WORLD_SIZE_X; ++x)
+		for (int y = 0; y < WORLD_SIZE_Y; ++y)
+		{
+			if (x < nbReduit)
+				m_chunks.Remove(x,y);
+			if (y < nbReduit)
+				m_chunks.Remove(x, y);
+			if (y > WORLD_SIZE_Y - nbReduit)
+				m_chunks.Remove(x, y);
+			if (x > WORLD_SIZE_X - nbReduit)
+				m_chunks.Remove(x, y);
+		}
+
+
+}
+
 BlockType World::BlockAt(float x, float y, float z, BlockType defaultBlockType) const {
 	Chunk* c = ChunkAt(x, y, z);
 
diff --git a/SQCSim-common/world.h b/SQCSim-common/world.h
index 8a166af..e9b4840 100644
--- a/SQCSim-common/world.h
+++ b/SQCSim-common/world.h
@@ -28,6 +28,8 @@ public:
 	Chunk* ChunkAt(float x, float y, float z) const;
 	Chunk* ChunkAt(const Vector3f& pos) const;
 
+	void RemoveChunk(int nbReduit);
+
 	BlockType BlockAt(float x, float y, float z, BlockType defaultBlockType = BTYPE_AIR) const;
 	BlockType BlockAt(const Vector3f& pos, BlockType defaultBlockType = BTYPE_AIR) const;
 
diff --git a/SQCSim2021/engine.cpp b/SQCSim2021/engine.cpp
index 76f379b..bc4b6b5 100644
--- a/SQCSim2021/engine.cpp
+++ b/SQCSim2021/engine.cpp
@@ -883,7 +883,11 @@ void Engine::DrawHud(float elapsedTime, BlockType bloc) {
 	glPushMatrix();
 
 	int timer = GetCountdown(elapsedTime);
-
+	for (int i = 1; i < WORLD_SIZE_X; i++)
+	{
+		if (timer <= COUNTDOWN - m_timerReductionChunk * i)
+			m_world.RemoveChunk(m_nbReductionChunk * i);
+	}
 	if (m_keyK) {
 		SystemNotification(m_messageNotification);
 		m_keyK = false;
@@ -953,6 +957,8 @@ int Engine::GetFps(float elapsedTime) const { return 1 / elapsedTime; }
 int Engine::GetCountdown(float elapsedTime) {
 	if (m_resetcountdown)
 	{
+		m_nbReductionChunk = 4;
+		m_timerReductionChunk = 30;
 		m_countdown = m_time + COUNTDOWN;
 		m_resetcountdown = false;
 	}
@@ -1081,6 +1087,7 @@ void Engine::Render(float elapsedTime) {
 		m_world.Update(m_bullets, m_player.GetPosition(), m_blockinfo);
 		m_renderer.UpdateMesh(&m_world, m_player.GetPosition(), m_blockinfo);
 
+		
 		if (m_isSkybox) m_skybox.Render(skybox);
 
 		DrawHud(elapsedTime, bloc);
diff --git a/SQCSim2021/engine.h b/SQCSim2021/engine.h
index d51d064..ab48557 100644
--- a/SQCSim2021/engine.h
+++ b/SQCSim2021/engine.h
@@ -109,6 +109,8 @@ private:
 
     int m_renderCount = 0;
     int m_countdown = COUNTDOWN;
+    int m_nbReductionChunk = 4;
+    int m_timerReductionChunk = 30;
 
     bool m_damage = false;