diff --git a/include/Cubed/constants.hpp b/include/Cubed/constants.hpp
index cc3fc14..48ec76c 100644
--- a/include/Cubed/constants.hpp
+++ b/include/Cubed/constants.hpp
@@ -16,6 +16,11 @@ constexpr int PRE_LOAD_DISTANCE = 24;
 constexpr int MAX_DISTANCE = 128;
 
 constexpr float DEFAULT_FOV = 70.0f;
+constexpr float DEFAULT_MAX_WALK_SPEED = 4.5f;
+constexpr float DEFAULT_MAX_RUN_SPEED = 7.0f;
+constexpr float DEFAULT_ACCELERATION = 10.0f;   
+constexpr float DEFAULT_DECELERATION = 15.0f;
+constexpr float DEFAULT_G = 22.5f;
 
 using HeightMapArray = std::array<std::array<float, CHUCK_SIZE>, CHUCK_SIZE>;
 
diff --git a/include/Cubed/dev_panel.hpp b/include/Cubed/dev_panel.hpp
index 2ec7ca1..fa2e793 100644
--- a/include/Cubed/dev_panel.hpp
+++ b/include/Cubed/dev_panel.hpp
@@ -16,6 +16,13 @@ class DevPanel {
         int height;
         int rendering_distance;
     };
+    struct PlayerProfile {
+        int game_mode = 0;
+        int gait = 0;
+    };
+    struct TextEditing {
+        bool perlin_seed = false;
+    };
 public:
     DevPanel(App& app);
     void init();
@@ -25,12 +32,16 @@ private:
     App& m_app;
     ConfigView m_config;
     Player* m_player;
-    
+    PlayerProfile m_player_profile;
+    TextEditing m_text_editing;
     bool m_need_save_config = false;
     int m_theme = 0;
     void show_settings_tab_item();
     void show_world_tab_item();
     void show_player_tab_item();
+
+    void update_player_profile();
+
 };
 
 
diff --git a/include/Cubed/gameplay/game_mode.hpp b/include/Cubed/gameplay/game_mode.hpp
index bb8d145..ed2d5b6 100644
--- a/include/Cubed/gameplay/game_mode.hpp
+++ b/include/Cubed/gameplay/game_mode.hpp
@@ -7,7 +7,7 @@ namespace Cubed {
 
 
 enum class GameMode {
-    CREATIVE,
+    CREATIVE = 0,
     SPECTATOR
 };
 
diff --git a/include/Cubed/gameplay/player.hpp b/include/Cubed/gameplay/player.hpp
index 1171f75..57e1567 100644
--- a/include/Cubed/gameplay/player.hpp
+++ b/include/Cubed/gameplay/player.hpp
@@ -3,6 +3,7 @@
 
 #include <Cubed/AABB.hpp>
 #include <Cubed/config.hpp>
+#include <Cubed/constants.hpp>
 #include <Cubed/gameplay/block.hpp>
 #include <Cubed/gameplay/chunk_pos.hpp>
 #include <Cubed/gameplay/game_mode.hpp>
@@ -14,7 +15,7 @@
 namespace Cubed {
 
 enum class Gait{
-    WALK,
+    WALK = 0,
     RUN
 };
 
@@ -23,27 +24,28 @@ class World;
 class Player {
 private:
     using enum GameMode;
-    constexpr static float WALK_SPEED = 4.5f;
-    constexpr static float RUN_SPEED = 7.0f;
-    constexpr static float ACCELERATION = 10.0f;   
-    constexpr static float DECELERATION = 15.0f;
-    constexpr static float G = 22.5f;
+    float m_max_walk_speed = DEFAULT_MAX_WALK_SPEED;
+    float m_max_run_speed = DEFAULT_MAX_RUN_SPEED;
+    float m_acceleration = DEFAULT_ACCELERATION;   
+    float m_deceleration = DEFAULT_DECELERATION;
+    float m_g = DEFAULT_G;
 
     constexpr static float MAX_SPACE_ON_TIME = 0.3f; 
+
     float m_yaw = 0.0f;
     float m_pitch = 0.0f;
     
     float m_sensitivity = 0.15f;
 
-    float max_speed = WALK_SPEED;
-    float y_speed = 0.0f;
+    float m_max_speed = m_max_walk_speed;
+    float m_y_speed = 0.0f;
     bool can_up = true;
     
     float space_on_time = 0.0f;
     bool space_on = false;
     bool is_fly = false;
     
-    float speed = 0;
+    float m_xz_speed = 0.0f;
     
     glm::vec3 direction = glm::vec3(0.0f, 0.0f, 0.0f);
     glm::vec3 move_distance {0.0f, 0.0f, 0.0f};
@@ -91,7 +93,15 @@ public:
     void update_player_move_state(int key, int action);
     void update_scroll(double yoffset);
 
-    
+    float& max_walk_speed();
+    float& max_run_speed();
+    float& max_speed();
+    float& acceleration(); 
+    float& deceleration();
+    float& g();
+
+    Gait& gait();
+    GameMode& game_mode();    
 
 };
 
diff --git a/include/Cubed/gameplay/world.hpp b/include/Cubed/gameplay/world.hpp
index 005d362..619725c 100644
--- a/include/Cubed/gameplay/world.hpp
+++ b/include/Cubed/gameplay/world.hpp
@@ -28,8 +28,6 @@ private:
     using ChunkUpdateList = std::vector<std::pair<ChunkPos, Chunk>>;
     using ConstChunkMap = std::unordered_map<ChunkPos, const Chunk*, ChunkPos::Hash>;
     using ChunkPosSet = std::unordered_set<ChunkPos, ChunkPos::Hash>;  
-    
-    bool m_could_gen = true;
 
     glm::vec3 m_gen_player_pos{0.0f, 0.0f, 0.0f};
     std::unordered_map<ChunkPos , Chunk, ChunkPos::Hash> m_chunks;
@@ -46,6 +44,8 @@ private:
     std::condition_variable m_gen_cv;
     std::atomic<bool> m_gen_running{false};
     std::atomic<bool> m_need_gen_chunk{false};
+    std::atomic<bool> m_is_rebuilding {false};
+    std::atomic<bool> m_could_gen{true};
     std::atomic<int> m_rendering_distance{24};
     std::vector<ChunkPos> m_dirty_queue;
     std::vector<ChunkRenderSnapshot> m_render_snapshots;
@@ -93,6 +93,8 @@ public:
 
     void hot_reload();
 
+    void rebuild_world();
+
 };
 
 }
diff --git a/include/Cubed/tools/perlin_noise.hpp b/include/Cubed/tools/perlin_noise.hpp
index 871be90..426497d 100644
--- a/include/Cubed/tools/perlin_noise.hpp
+++ b/include/Cubed/tools/perlin_noise.hpp
@@ -9,13 +9,18 @@ class PerlinNoise {
 public:
     static void init();
     static float noise(float x, float y, float z);
+    static void reload();
+    static const unsigned& seed();
+    static void seed(unsigned seed);
 private:
     static inline std::atomic<bool> is_init = false;
     static inline std::vector<int> p;
-
+    static inline unsigned m_seed = 0;
+    static inline bool is_seed_change = false;
     static float fade(float t);
     static float lerp(float t, float a, float b);
     static float grad(int hash, float x, float y, float z);
+    
 };
 
 }
\ No newline at end of file
diff --git a/src/dev_panel.cpp b/src/dev_panel.cpp
index 4ab2075..fa4012c 100644
--- a/src/dev_panel.cpp
+++ b/src/dev_panel.cpp
@@ -2,6 +2,7 @@
 #include <Cubed/app.hpp>
 #include <Cubed/gameplay/player.hpp>
 #include <Cubed/tools/log.hpp>
+#include <Cubed/tools/perlin_noise.hpp>
 
 #include <imgui.h>
 #include <imgui_impl_glfw.h>
@@ -9,6 +10,21 @@
 
 namespace Cubed {
 
+static constexpr const char* THEMES[] = {"Dark", "Light"};
+static constexpr const char* GAITS[] = {"Walk", "Run"};
+static constexpr const char* GAME_MODES[] = {"Creative", "Spectator"};
+static char perlin_noise_input_buffer[64];
+
+static int filter_unsigned(ImGuiInputTextCallbackData* data) {
+    if (data->EventFlag == ImGuiInputTextFlags_CallbackCharFilter) {
+        char c = data->EventChar;
+        if (c < '0' || c > '9') {
+            return 1;
+        }
+    }
+    return 0;
+}
+
 DevPanel::DevPanel(App& app) :
     m_app(app)
 {
@@ -29,6 +45,7 @@ void DevPanel::init() {
     if (m_theme != 1 && m_theme != 0) {
         m_theme = 0;
     }
+    update_player_profile();
 }
 
 void DevPanel::render() {
@@ -51,6 +68,8 @@ void DevPanel::render() {
     ImGui::Text("This is a DevPanel to control the game\n"); 
     if (ImGui::BeginTabBar("Bar")) {
         show_settings_tab_item();
+        show_world_tab_item();
+        show_player_tab_item();
         ImGui::EndTabBar();
     }
     ImGui::End(); 
@@ -67,7 +86,7 @@ void DevPanel::show_settings_tab_item() {
         }
         ImGui::SameLine();
         if (ImGui::Button("default##1")) {
-            m_config.fov = NORMAL_FOV;
+            m_config.fov = DEFAULT_FOV;
             Config::get().set("player.fov", static_cast<double>(m_config.fov));
             m_app.renderer().hot_reload();
         }
@@ -94,7 +113,7 @@ void DevPanel::show_settings_tab_item() {
             Config::get().set("window.V-Sync", m_config.v_sync);
             m_app.window().hot_reload();
         }
-        constexpr const char* THEMES[] = {"Dark", "Light"};
+
         if (ImGui::Combo("Theme", &m_theme, THEMES, IM_ARRAYSIZE(THEMES))) {
             if (m_theme == 0) {
                 ImGui::StyleColorsDark();
@@ -112,4 +131,99 @@ void DevPanel::show_settings_tab_item() {
     
 }
 
+void DevPanel::show_world_tab_item() {
+    if (ImGui::BeginTabItem("world")) {
+        if (m_text_editing.perlin_seed) {
+            if (ImGui::InputText("Perlin Noise Seed", perlin_noise_input_buffer, sizeof(perlin_noise_input_buffer),
+                    ImGuiInputTextFlags_CallbackCharFilter |
+                    ImGuiInputTextFlags_EnterReturnsTrue,
+                    filter_unsigned)) 
+            {
+                PerlinNoise::seed(static_cast<unsigned int>(std::strtoul(perlin_noise_input_buffer, nullptr, 10)));   
+                m_text_editing.perlin_seed = false;
+            }
+        }
+        if (!m_text_editing.perlin_seed) {
+            ImGui::Text("Perlin Noise Seed: %u", PerlinNoise::seed());
+            if (ImGui::IsItemClicked()) {
+                m_text_editing.perlin_seed = true;
+            }
+        }
+        if (ImGui::Button("Rebuild World")) {
+            m_app.world().rebuild_world();
+        }
+        ImGui::EndTabItem();
+    }
+}
+
+void DevPanel::show_player_tab_item() {
+    if (!m_player) {
+        Logger::error("Player is Nullptr");
+        return;
+    }
+    if (ImGui::BeginTabItem("player")) {
+        if (ImGui::Combo("GameMode", &m_player_profile.game_mode, GAME_MODES, IM_ARRAYSIZE(GAME_MODES))) {
+            if (m_player_profile.game_mode == 0) {
+                m_player->change_mode(GameMode::CREATIVE);
+            } else if (m_player_profile.game_mode == 1) {
+                m_player->change_mode(GameMode::SPECTATOR);
+            } else {
+                ASSERT_MSG(false, "Unknown GameMode");
+            }
+        }
+        if (m_player->game_mode() == GameMode::CREATIVE) {
+            if (ImGui::Combo("Gait", &m_player_profile.gait, GAITS, IM_ARRAYSIZE(GAITS))) {
+            if (m_player_profile.gait == 0) {
+                m_player->gait() = Gait::WALK;
+            } else if (m_player_profile.gait == 1) {
+                m_player->gait() = Gait::RUN;
+            } else {
+                ASSERT_MSG(false, "Unknown Gait");
+            }
+        }
+        }
+        ImGui::SliderFloat("Acceleration", &m_player->acceleration(), 1.0f, 200.0f);
+        ImGui::SliderFloat("Deceleration", &m_player->deceleration(), 1.0f, 200.0f);
+        if (m_player->game_mode() == GameMode::CREATIVE) {
+            m_player_profile.game_mode = 0;
+            ImGui::SliderFloat("MaxWalkSpeed", &m_player->max_walk_speed(), 1.0f, 200.0f);
+            ImGui::SliderFloat("MaxRunSpeed", &m_player->max_run_speed(), 1.0f, 500.0f);
+            ImGui::SliderFloat("G", &m_player->g(), 1.0f, 200.0f);
+            
+        } else if (m_player->game_mode() == GameMode::SPECTATOR) {
+            m_player_profile.game_mode = 1;
+            ImGui::SliderFloat("MaxSpeed", &m_player->max_speed(), 1.0f, 500.0f);
+        }
+        if (ImGui::Button("reset")) {
+                m_player->max_walk_speed() = DEFAULT_MAX_WALK_SPEED;
+                m_player->max_run_speed() = DEFAULT_MAX_RUN_SPEED;
+                m_player->acceleration() = DEFAULT_ACCELERATION;
+                m_player->deceleration() = DEFAULT_DECELERATION;
+                m_player->g() = DEFAULT_G;
+                m_player->change_mode(GameMode::CREATIVE);
+                m_player->gait() = Gait::WALK;
+                m_player_profile.game_mode = 0;
+                m_player_profile.gait = 0;
+            }
+        if (m_player->gait() == Gait::WALK) {
+            m_player_profile.gait = 0;
+        } else {
+            m_player_profile.gait = 1;
+        }
+        
+        
+        ImGui::EndTabItem();
+    }
+}
+
+void DevPanel::update_player_profile() {
+    if (!m_player) {
+        Logger::error("Player is Nullptr");
+        ASSERT(false);
+        return;
+    }
+    m_player_profile.gait = std::to_underlying(m_player->gait());
+    m_player_profile.game_mode = std::to_underlying(m_player->game_mode());
+}
+
 }
\ No newline at end of file
diff --git a/src/gameplay/player.cpp b/src/gameplay/player.cpp
index a0178ba..4b0eb8d 100644
--- a/src/gameplay/player.cpp
+++ b/src/gameplay/player.cpp
@@ -141,6 +141,7 @@ void Player::change_mode(GameMode mode) {
     } else if (mode == SPECTATOR) {
         is_fly = true;
         m_gait = Gait::RUN;
+        m_max_speed = m_max_run_speed;
     }
 }
 
@@ -165,7 +166,7 @@ void Player::update(float delta_time) {
             m_player_pos.x, m_player_pos.y, m_player_pos.z
         ));
     
-    DebugCollector::get().report("speed", std::format("Speed: {:.2} m/s", speed));
+    DebugCollector::get().report("speed", std::format("Speed: {:.2} m/s", m_xz_speed));
 }
 
 void Player::update_player_move_state(int key, int action) {
@@ -212,7 +213,7 @@ void Player::update_player_move_state(int key, int action) {
                 if (space_on) {
                     if (m_game_mode == CREATIVE) {
                         is_fly = !is_fly ? true : false;
-                        y_speed = 0.0f;
+                        m_y_speed = 0.0f;
                     }
                     space_on = false;
                     space_on_time = 0.0f;
@@ -356,10 +357,10 @@ void Player::update_move(float delta_time) {
     }
     if (m_game_mode != SPECTATOR) {
         if (m_gait == Gait::RUN) {
-            max_speed = RUN_SPEED;
+            m_max_speed = m_max_run_speed;
         }
         if (m_gait == Gait::WALK) {
-            max_speed = WALK_SPEED;
+            m_max_speed = m_max_walk_speed;
         }
     }
 
@@ -374,45 +375,45 @@ void Player::update_move(float delta_time) {
     // calculate speed
     if (m_move_state.forward || m_move_state.back || m_move_state.left || m_move_state.right || m_move_state.up) {
         direction = glm::vec3(0.0f, 0.0f, 0.0f);
-        speed += ACCELERATION * delta_time;
-        if (speed > max_speed) {
-            speed = max_speed;
+        m_xz_speed += m_acceleration * delta_time;
+        if (m_xz_speed > m_max_speed) {
+            m_xz_speed = m_max_speed;
         }
     } else {
-        speed += -DECELERATION * delta_time;
-        if (speed < 0) {
-            speed = 0;
+        m_xz_speed += -m_deceleration * delta_time;
+        if (m_xz_speed < 0) {
+            m_xz_speed = 0;
             direction = glm::vec3(0.0f, 0.0f, 0.0f);
         }
     }
 
     update_direction();
 
-    move_distance = {direction.x * speed * delta_time, 0.0f, direction.z * speed * delta_time};
+    move_distance = {direction.x * m_xz_speed * delta_time, 0.0f, direction.z * m_xz_speed * delta_time};
     
     if (is_fly) {
         if (m_move_state.up) {
-        y_speed = 7.5f;
+        m_y_speed = 7.5f;
         }
 
         if (m_move_state.down) {
-            y_speed = -7.5f;
+            m_y_speed = -7.5f;
         }
 
         if (!m_move_state.down && !m_move_state.up) {
-            y_speed = 0.0f;
+            m_y_speed = 0.0f;
         }
     } else {
         if (m_move_state.up && can_up) {
-        y_speed = 7.5;
+        m_y_speed = 7.5;
         can_up = false;
         
         }
 
-        y_speed += -G * delta_time;
+        m_y_speed += -m_g * delta_time;
     }
     
-    move_distance.y = y_speed * delta_time;
+    move_distance.y = m_y_speed * delta_time;
     // y
     update_y_move();
     // x
@@ -482,7 +483,7 @@ void Player::update_y_move() {
                     };
                     if (player_box.intersects(block_box)) {
                         m_player_pos.y -= move_distance.y;
-                        y_speed = 0.0f;
+                        m_y_speed = 0.0f;
                         if (move_distance.y < 0) {
                             can_up = true;
                             is_fly = false;
@@ -530,14 +531,40 @@ void Player::update_z_move() {
 void Player::update_scroll(double yoffset) {
     if (m_game_mode == SPECTATOR) {
         if (yoffset > 0) {
-            max_speed += 1.0f;
+            if (m_max_speed < 500.0f) {
+                m_max_speed += 1.0f;
+            }
         } else {
-            if (max_speed > WALK_SPEED) {
-                max_speed -= 1.0f;
+            if (m_max_speed > 1.0f) {
+                m_max_speed -= 1.0f;
             }
         }
     }   
 }
 
+float& Player::max_walk_speed() {
+    return m_max_walk_speed;
+}
+float& Player::max_run_speed() {
+    return m_max_run_speed;
+}
+float& Player::max_speed() {
+    return m_max_speed;
+}
+float& Player::acceleration() {
+    return m_acceleration;
+}
+float& Player::deceleration() {
+    return m_deceleration;
+}
+float& Player::g() {
+    return m_g;
+}
+Gait& Player::gait() {
+    return m_gait;
+}
+GameMode& Player::game_mode() {
+    return m_game_mode;
+}
 
 }
diff --git a/src/gameplay/world.cpp b/src/gameplay/world.cpp
index 255278b..d18058a 100644
--- a/src/gameplay/world.cpp
+++ b/src/gameplay/world.cpp
@@ -6,6 +6,7 @@
 #include <Cubed/tools/cubed_assert.hpp>
 #include <Cubed/tools/cubed_hash.hpp>
 #include <Cubed/tools/math_tools.hpp>
+#include <Cubed/tools/perlin_noise.hpp>
 
 #include <execution>
 
@@ -671,4 +672,27 @@ void World::hot_reload() {
     need_gen();
 }
 
+void World::rebuild_world() {
+    if (m_is_rebuilding) {
+        return;
+    }
+    m_is_rebuilding = true;
+    stop_gen_thread();
+    
+    {
+        std::scoped_lock lk(m_chunks_mutex, m_new_chunk_queue_mutex);
+        m_chunks.clear();
+        m_new_chunk_queue.clear();
+    }
+    m_could_gen = true;
+    PerlinNoise::reload();
+    start_gen_thread();
+    need_gen();
+    
+    m_is_rebuilding = false;
+    for (auto& player : m_players) {
+        player.second.set_player_pos({0.0f, 255.0f, 0.0f});
+    }
+}
+
 }
\ No newline at end of file
diff --git a/src/tools/perlin_noise.cpp b/src/tools/perlin_noise.cpp
index fbb5205..2d66ff4 100644
--- a/src/tools/perlin_noise.cpp
+++ b/src/tools/perlin_noise.cpp
@@ -19,6 +19,7 @@ void PerlinNoise::init() {
 
     p.insert(p.end(), p.begin(), p.end());
     is_init = true;
+    m_seed = seed;
 }
 
 float PerlinNoise::noise(float x, float y, float z) {
@@ -73,4 +74,27 @@ float PerlinNoise::grad(int hash, float x, float y, float z) {
     return ((h & 1) == 0 ? u : -u) + ((h & 2) == 0 ? v : -v);
 }
 
+void PerlinNoise::reload() {
+    if (!is_seed_change) {
+        Logger::warn("Seed Not Change");
+        return;
+    }
+    is_init = false;
+    p.resize(256);
+    std::iota(p.begin(), p.end(), 0);
+    Logger::info("Reload Perlin Noise With Seed {}", m_seed);
+    std::shuffle(p.begin(), p.end(), std::mt19937(m_seed));
+
+    p.insert(p.end(), p.begin(), p.end());
+    is_init = true;
+    is_seed_change = false;
+}
+
+const unsigned& PerlinNoise::seed() {
+    return m_seed;
+}
+void PerlinNoise::seed(unsigned seed) {
+    m_seed = seed;
+    is_seed_change = true;
+}
 }
\ No newline at end of file