diff --git a/data/enemies/upv_student.gif b/data/enemies/upv_student.gif
index a44675c..2766d3f 100644
Binary files a/data/enemies/upv_student.gif and b/data/enemies/upv_student.gif differ
diff --git a/data/room/03.yaml b/data/room/03.yaml
index 4d2fcf0..ba6b4e1 100644
--- a/data/room/03.yaml
+++ b/data/room/03.yaml
@@ -72,7 +72,7 @@ enemies:
     velocity: {x: 24, y: 0}
     boundaries:
       position1: {x: 3, y: 2}
-      position2: {x: 11, y: 2}
+      position2: {x: 19, y: 2}
     color: 12
 
 # Objetos en esta habitación
diff --git a/source/game/editor/map_editor.cpp b/source/game/editor/map_editor.cpp
index f3d86dd..007063c 100644
--- a/source/game/editor/map_editor.cpp
+++ b/source/game/editor/map_editor.cpp
@@ -289,8 +289,6 @@ auto MapEditor::revert() -> std::string {
     }
     room_->setItemColors(room_data_.item_color1, room_data_.item_color2);
 
-    // Refrescar visuales de la habitación
-    room_->setBgColor(room_data_.bg_color);
     // Restaurar el tilemap completo
     for (int i = 0; i < static_cast<int>(room_data_.tile_map.size()); ++i) {
         room_->setTile(i, room_data_.tile_map[i]);
@@ -521,7 +519,7 @@ void MapEditor::handleEvent(const SDL_Event& event) {  // NOLINT(readability-fun
             tile_picker_.on_select = [this](int tile) {
                 brush_tile_ = tile;
             };
-            tile_picker_.open(room_->getTileSetFile(), current, room_data_.bg_color);
+            tile_picker_.open(room_->getTileSetFile(), current, 0);
         }
         return;
     }
@@ -991,7 +989,7 @@ void MapEditor::updateStatusBarInfo() {  // NOLINT(readability-function-cognitiv
             conv = "right";
         }
 
-        line2 = "bg:" + std::to_string(room_data_.bg_color) + "  conv:" + conv;
+        line2 = "conv:" + conv;
         line3 = "u:" + conn(room_data_.upper_room) + " d:" + conn(room_data_.lower_room) +
             " l:" + conn(room_data_.left_room) + " r:" + conn(room_data_.right_room) +
             "  itm:" + std::to_string(room_data_.item_color1) + "/" + std::to_string(room_data_.item_color2);
@@ -1223,14 +1221,6 @@ auto MapEditor::setRoomProperty(const std::string& property, const std::string&
 
     std::string val = toLower(value);
 
-    if (property == "BGCOLOR") {
-        auto color = static_cast<Uint8>(safeStoi(val, 0));
-        room_data_.bg_color = color;
-        room_->setBgColor(color);
-        autosave();
-        return "bgcolor: " + std::to_string(color);
-    }
-
     if (property == "ITEMCOLOR1") {
         auto color = static_cast<Uint8>(safeStoi(val, 0));
         room_data_.item_color1 = color;
@@ -1353,7 +1343,7 @@ auto MapEditor::setRoomProperty(const std::string& property, const std::string&
         return toLower(property) + ": " + connection;
     }
 
-    return "Unknown property: " + property + " (use: bgcolor, itemcolor1, itemcolor2, conveyor, tileset, up, down, left, right)";
+    return "Unknown property: " + property + " (use: itemcolor1, itemcolor2, conveyor, tileset, up, down, left, right)";
 }
 
 // Crea una nueva habitación
@@ -1405,7 +1395,6 @@ auto MapEditor::createNewRoom(const std::string& direction) -> std::string {  //
     // Crear Room::Data por defecto con conexión recíproca
     Room::Data new_room;
     new_room.number = std::string(name_buf).substr(0, std::string(name_buf).find('.'));
-    new_room.bg_color = 0;
     new_room.tile_set_file = "standard.gif";
     new_room.item_color1 = 11;
     new_room.item_color2 = 12;
@@ -1439,7 +1428,6 @@ auto MapEditor::createNewRoom(const std::string& direction) -> std::string {  //
     file << "room:\n";
     file << "  name_en: \"NO_NAME\"\n";
     file << "  name_ca: \"NO_NAME\"\n";
-    file << "  bgColor: black\n";
     file << "  tileSetFile: standard.gif\n";
     file << "\n";
     file << "  connections:\n";
@@ -1698,7 +1686,7 @@ void MapEditor::renderGrid() const {
     auto game_surface = Screen::get()->getRendererSurface();
     if (!game_surface) { return; }
 
-    const Uint8 COLOR = pickGridColor(room_data_.bg_color, game_surface);
+    const Uint8 COLOR = pickGridColor(0, game_surface);
 
     // Líneas verticales (cada 8 pixels)
     for (int x = Tile::SIZE; x < PlayArea::WIDTH; x += Tile::SIZE) {
diff --git a/source/game/editor/room_saver.cpp b/source/game/editor/room_saver.cpp
index 9502a1c..3acc01e 100644
--- a/source/game/editor/room_saver.cpp
+++ b/source/game/editor/room_saver.cpp
@@ -43,7 +43,7 @@ auto RoomSaver::buildYAML(const fkyaml::node& original_yaml, const Room::Data& r
     // --- Sección room ---
     out << "room:\n";
 
-    out << "  bgColor: " << static_cast<int>(room_data.bg_color) << "\n";
+    // bgColor ya no se escribe en el YAML
     out << "  tileSetFile: " << room_data.tile_set_file << "\n";
 
     // Conexiones
diff --git a/source/game/entities/player.hpp b/source/game/entities/player.hpp
index 2e9f8de..cac4c13 100644
--- a/source/game/entities/player.hpp
+++ b/source/game/entities/player.hpp
@@ -31,7 +31,7 @@ class Player {
     };
 
     // --- Constantes de física ---
-    static constexpr float HORIZONTAL_VELOCITY = 60.0F;
+    static constexpr float HORIZONTAL_VELOCITY = 75.0F;
     static constexpr float HORIZONTAL_ACCEL = 500.0F;
     static constexpr float MAX_VY = 160.0F;
     static constexpr float JUMP_VELOCITY = -178.5F;
diff --git a/source/game/gameplay/room_loader.cpp b/source/game/gameplay/room_loader.cpp
index a77fc97..a76626c 100644
--- a/source/game/gameplay/room_loader.cpp
+++ b/source/game/gameplay/room_loader.cpp
@@ -70,9 +70,7 @@ void RoomLoader::parseRoomConfig(const fkyaml::node& yaml, Room::Data& room, con
     room.number = file_name.substr(0, file_name.find_last_of('.'));
 
     // Basic properties
-    if (room_node.contains("bgColor")) {
-        room.bg_color = readColorNode(room_node["bgColor"]);
-    }
+    // bgColor ya no se lee del YAML; bg_color queda siempre a 0
     if (room_node.contains("tileSetFile")) {
         room.tile_set_file = room_node["tileSetFile"].get_value<std::string>();
     }
diff --git a/source/game/scenes/game.cpp b/source/game/scenes/game.cpp
index b2b633e..0b271e3 100644
--- a/source/game/scenes/game.cpp
+++ b/source/game/scenes/game.cpp
@@ -66,7 +66,7 @@ Game::Game(Mode mode)
     // Crea objetos e inicializa variables
     ItemTracker::init();
     demoInit();
-    room_ = std::make_shared<Room>(current_room_, scoreboard_data_);
+    room_ = getOrCreateRoom(current_room_);
     initPlayer(spawn_data_, room_);
     game_backbuffer_surface_ = std::make_shared<Surface>(Options::game.width, Options::game.height);
     changeRoom(current_room_);
@@ -314,6 +314,7 @@ void Game::updatePlaying(float delta_time) {
     if (transitioning_) {
         transition_old_room_->update(delta_time);
     }
+    updateAdjacentRooms(delta_time);
     switch (mode_) {
         case Mode::GAME:
 #ifdef _DEBUG
@@ -420,8 +421,10 @@ void Game::transitionToState(State new_state) {
 
     // Lógica de ENTRADA según el nuevo estado
     if (new_state == State::BLACK_SCREEN) {
+        // Limpiar caché de habitaciones (enemigos vuelven a sus posiciones iniciales)
+        room_cache_.clear();
         // Respawn room y player
-        room_ = std::make_shared<Room>(current_room_, scoreboard_data_);
+        room_ = getOrCreateRoom(current_room_);
         initPlayer(spawn_data_, room_);
         // Pausar ambos
         room_->setPaused(true);
@@ -763,8 +766,8 @@ auto Game::changeRoom(const std::string& room_path) -> bool {
 
     // Verifica que exista el fichero que se va a cargar
     if (!Resource::List::get()->get(room_path).empty()) {  // NOLINT(readability-static-accessed-through-instance)
-        // Crea un objeto habitación nuevo a partir del fichero
-        room_ = std::make_shared<Room>(room_path, scoreboard_data_);
+        // Obtiene la habitación del caché o la crea
+        room_ = getOrCreateRoom(room_path);
 
         // Pone el color del marcador en función del color del borde de la habitación
         if (room_tracker_->addRoom(room_path)) {
@@ -788,6 +791,32 @@ auto Game::changeRoom(const std::string& room_path) -> bool {
     return false;
 }
 
+// Obtiene una habitación del caché o la crea si no existe
+auto Game::getOrCreateRoom(const std::string& room_path) -> std::shared_ptr<Room> {
+    auto it = room_cache_.find(room_path);
+    if (it != room_cache_.end()) {
+        return it->second;
+    }
+    auto room = std::make_shared<Room>(room_path, scoreboard_data_);
+    room_cache_[room_path] = room;
+    return room;
+}
+
+// Actualiza los enemigos de las habitaciones adyacentes a la actual
+void Game::updateAdjacentRooms(float delta_time) {
+    for (auto border : {Room::Border::TOP, Room::Border::RIGHT, Room::Border::BOTTOM, Room::Border::LEFT}) {
+        const auto ROOM_NAME = room_->getRoom(border);
+        if (ROOM_NAME == "0") {
+            continue;
+        }
+        auto adjacent = getOrCreateRoom(ROOM_NAME);
+        // Evitar actualizar la habitación actual o la que ya se actualiza en la transición
+        if (adjacent != room_ && adjacent != transition_old_room_) {
+            adjacent->update(delta_time);
+        }
+    }
+}
+
 // Comprueba si el jugador esta en el borde de la pantalla
 void Game::checkPlayerIsOnBorder() {
     // No permitir transiciones encadenadas
diff --git a/source/game/scenes/game.hpp b/source/game/scenes/game.hpp
index 6a4890d..9abf6db 100644
--- a/source/game/scenes/game.hpp
+++ b/source/game/scenes/game.hpp
@@ -2,10 +2,11 @@
 
 #include <SDL3/SDL.h>
 
-#include <initializer_list>  // Para initializer_list
-#include <memory>            // Para shared_ptr
-#include <string>            // Para string
-#include <vector>            // Para vector
+#include <initializer_list>   // Para initializer_list
+#include <memory>             // Para shared_ptr
+#include <string>             // Para string
+#include <unordered_map>      // Para unordered_map
+#include <vector>             // Para vector
 
 #include "game/entities/player.hpp"  // Para PlayerSpawn
 #include "game/gameplay/room.hpp"    // Para Room, Room::Border
@@ -68,6 +69,8 @@ class Game {
     void renderFadeToEnding();                                                          // Renderiza el juego en estado FADE_TO_ENDING (via backbuffer)
     static void renderPostFadeEnding();                                                 // Renderiza el juego en estado POST_FADE_ENDING (pantalla negra)
     auto changeRoom(const std::string& room_path) -> bool;                              // Cambia de habitación
+    auto getOrCreateRoom(const std::string& room_path) -> std::shared_ptr<Room>;        // Obtiene una habitación del caché o la crea
+    void updateAdjacentRooms(float delta_time);                                         // Actualiza enemigos de las habitaciones adyacentes
     void handleInput();                                                                 // Comprueba el teclado
     void checkPlayerIsOnBorder();                                                       // Comprueba si el jugador esta en el borde de la pantalla y actua
     auto checkPlayerAndEnemies() -> bool;                                               // Comprueba las colisiones del jugador con los enemigos
@@ -105,6 +108,9 @@ class Game {
     float state_time_{0.0F};        // Tiempo acumulado en el estado actual
     float fade_accumulator_{0.0F};  // Acumulador de tiempo para el fade
 
+    // Caché de habitaciones vivas (enemigos mantienen su posición)
+    std::unordered_map<std::string, std::shared_ptr<Room>> room_cache_;
+
     // Transición animada entre pantallas
     bool transitioning_{false};                              // Indica si hay una transición en curso
     float transition_timer_{0.0F};                           // Tiempo transcurrido en la transición