diff --git a/api/src/main/java/com/bartlomiejpluta/base/api/game/entity/EntityDelegate.java b/api/src/main/java/com/bartlomiejpluta/base/api/game/entity/EntityDelegate.java
new file mode 100644
index 00000000..55320cd6
--- /dev/null
+++ b/api/src/main/java/com/bartlomiejpluta/base/api/game/entity/EntityDelegate.java
@@ -0,0 +1,172 @@
+package com.bartlomiejpluta.base.api.game.entity;
+
+import com.bartlomiejpluta.base.api.game.camera.Camera;
+import com.bartlomiejpluta.base.api.game.window.Window;
+import com.bartlomiejpluta.base.api.internal.object.Placeable;
+import com.bartlomiejpluta.base.api.internal.render.ShaderManager;
+import org.joml.Matrix4f;
+import org.joml.Vector2f;
+import org.joml.Vector2i;
+
+public abstract class EntityDelegate implements Entity {
+   private final Entity entity;
+
+   protected EntityDelegate(Entity entity) {
+      this.entity = entity;
+   }
+
+   @Override
+   public void setStepSize(float x, float y) {
+      entity.setStepSize(x, y);
+   }
+
+   @Override
+   public Vector2i getCoordinates() {
+      return entity.getCoordinates();
+   }
+
+   @Override
+   public void setCoordinates(Vector2i coordinates) {
+      entity.setCoordinates(coordinates);
+   }
+
+   @Override
+   public void setCoordinates(int x, int y) {
+      entity.setCoordinates(x, y);
+   }
+
+   @Override
+   public Movement prepareMovement(Direction direction) {
+      return entity.prepareMovement(direction);
+   }
+
+   @Override
+   public Direction getFaceDirection() {
+      return entity.getFaceDirection();
+   }
+
+   @Override
+   public void setFaceDirection(Direction direction) {
+      entity.setFaceDirection(direction);
+   }
+
+   @Override
+   public void setSpeed(float speed) {
+      entity.setSpeed(speed);
+   }
+
+   @Override
+   public void setAnimationSpeed(float speed) {
+      entity.setAnimationSpeed(speed);
+   }
+
+   @Override
+   public boolean isMoving() {
+      return entity.isMoving();
+   }
+
+   @Override
+   public int chebyshevDistance(Entity other) {
+      return entity.chebyshevDistance(other);
+   }
+
+   @Override
+   public int manhattanDistance(Entity other) {
+      return entity.manhattanDistance(other);
+   }
+
+   @Override
+   public Direction getDirectionTowards(Entity target) {
+      return entity.getDirectionTowards(target);
+   }
+
+   @Override
+   public Vector2f getPosition() {
+      return entity.getPosition();
+   }
+
+   @Override
+   public void setPosition(float x, float y) {
+      entity.setPosition(x, y);
+   }
+
+   @Override
+   public void setPosition(Vector2f position) {
+      entity.setPosition(position);
+   }
+
+   @Override
+   public void movePosition(float x, float y) {
+      entity.movePosition(x, y);
+   }
+
+   @Override
+   public void movePosition(Vector2f position) {
+      entity.movePosition(position);
+   }
+
+   @Override
+   public float getRotation() {
+      return entity.getRotation();
+   }
+
+   @Override
+   public void setRotation(float rotation) {
+      entity.setRotation(rotation);
+   }
+
+   @Override
+   public void moveRotation(float rotation) {
+      entity.moveRotation(rotation);
+   }
+
+   @Override
+   public float getScaleX() {
+      return entity.getScaleX();
+   }
+
+   @Override
+   public void setScaleX(float scale) {
+      entity.setScaleX(scale);
+   }
+
+   @Override
+   public float getScaleY() {
+      return entity.getScaleY();
+   }
+
+   @Override
+   public void setScaleY(float scale) {
+      entity.setScaleY(scale);
+   }
+
+   @Override
+   public void setScale(float scale) {
+      entity.setScale(scale);
+   }
+
+   @Override
+   public void setScale(float scaleX, float scaleY) {
+      entity.setScale(scaleX, scaleY);
+   }
+
+   @Override
+   public float euclideanDistance(Placeable other) {
+      return entity.euclideanDistance(other);
+   }
+
+   @Override
+   public Matrix4f getModelMatrix() {
+      return entity.getModelMatrix();
+   }
+
+   @Override
+   public void update(float dt) {
+      entity.update(dt);
+   }
+
+   @Override
+   public void render(Window window, Camera camera, ShaderManager shaderManager) {
+      entity.render(window, camera, shaderManager);
+   }
+}
diff --git a/api/src/main/java/com/bartlomiejpluta/base/api/game/rule/BaseRule.java b/api/src/main/java/com/bartlomiejpluta/base/api/game/rule/BaseRule.java
new file mode 100644
index 00000000..a25dc8c7
--- /dev/null
+++ b/api/src/main/java/com/bartlomiejpluta/base/api/game/rule/BaseRule.java
@@ -0,0 +1,32 @@
+package com.bartlomiejpluta.base.api.game.rule;
+
+import com.bartlomiejpluta.base.api.game.entity.Entity;
+
+import java.util.LinkedList;
+import java.util.List;
+
+public abstract class BaseRule implements Rule {
+   private final List<Entity> invoked = new LinkedList<>();
+
+   protected abstract boolean test(Entity entity);
+
+   protected abstract void invoke(Entity entity);
+
+   @Override
+   public boolean when(Entity entity) {
+      if (test(entity)) {
+         return true;
+      }
+
+      invoked.remove(entity);
+      return false;
+   }
+
+   @Override
+   public void then(Entity entity) {
+      if (!invoked.contains(entity)) {
+         invoke(entity);
+         invoked.add(entity);
+      }
+   }
+}
\ No newline at end of file