diff --git a/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/base/BaseWidget.java b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/base/BaseWidget.java
new file mode 100644
index 00000000..c06d71a9
--- /dev/null
+++ b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/base/BaseWidget.java
@@ -0,0 +1,274 @@
+package com.bartlomiejpluta.base.api.game.gui.base;
+
+public abstract class BaseWidget implements Widget {
+   protected Widget parent;
+
+   protected SizeMode widthMode = SizeMode.NORMAL;
+   protected SizeMode heightMode = SizeMode.NORMAL;
+
+   protected float x;
+   protected float y;
+
+   protected float width;
+   protected float height;
+
+   protected float marginTop;
+   protected float marginRight;
+   protected float marginBottom;
+   protected float marginLeft;
+
+   protected float paddingTop;
+   protected float paddingRight;
+   protected float paddingBottom;
+   protected float paddingLeft;
+
+   protected abstract float getContentWidth();
+
+   protected abstract float getContentHeight();
+
+   @Override
+   public float getWidth() {
+      return widthMode == SizeMode.MATCH_PARENT
+            ? (parent != null ? parent.getWidth() - parent.getPaddingLeft() - parent.getPaddingRight() - marginLeft - marginRight : 0)
+            : getActualWidth();
+   }
+
+   @Override
+   public float getActualWidth() {
+      return paddingLeft + (widthMode == SizeMode.NORMAL ? width : getContentWidth()) + paddingRight;
+   }
+
+   @Override
+   public float getHeight() {
+      return heightMode == SizeMode.MATCH_PARENT
+            ? (parent != null ? parent.getHeight() - parent.getPaddingTop() - parent.getPaddingBottom() - marginTop - marginBottom : 0)
+            : getActualHeight();
+   }
+
+   @Override
+   public float getActualHeight() {
+      return paddingTop + (heightMode == SizeMode.NORMAL ? height : getContentHeight()) + paddingBottom;
+   }
+
+   @Override
+   public void setWidth(float width) {
+      this.width = width;
+   }
+
+   @Override
+   public void setHeight(float height) {
+      this.height = height;
+   }
+
+   @Override
+   public void setSize(float width, float height) {
+      this.width = width;
+      this.height = height;
+   }
+
+   @Override
+   public void setSizeMode(SizeMode widthMode, SizeMode heightMode) {
+      this.widthMode = widthMode;
+      this.heightMode = heightMode;
+   }
+
+   @Override
+   public SizeMode getWidthMode() {
+      return widthMode;
+   }
+
+   @Override
+   public void setWidthMode(SizeMode mode) {
+      this.widthMode = mode;
+   }
+
+   @Override
+   public SizeMode getHeightMode() {
+      return heightMode;
+   }
+
+   @Override
+   public void setHeightMode(SizeMode mode) {
+      this.heightMode = mode;
+   }
+
+   @Override
+   public Widget getParent() {
+      return parent;
+   }
+
+   @Override
+   public void setParent(Widget parent) {
+      this.parent = parent;
+   }
+
+   @Override
+   public float getX() {
+      return x;
+   }
+
+   @Override
+   public float getY() {
+      return y;
+   }
+
+   @Override
+   public void setX(float x) {
+      this.x = x;
+   }
+
+   @Override
+   public void setY(float y) {
+      this.y = y;
+   }
+
+   @Override
+   public void setPosition(float x, float y) {
+      this.x = x;
+      this.y = y;
+   }
+
+   @Override
+   public void setMargin(float top, float right, float bottom, float left) {
+      this.marginTop = top;
+      this.marginRight = right;
+      this.marginBottom = bottom;
+      this.marginLeft = left;
+   }
+
+   @Override
+   public void setMargin(float top, float rightLeft, float bottom) {
+      this.marginTop = top;
+      this.marginRight = rightLeft;
+      this.marginBottom = bottom;
+      this.marginLeft = rightLeft;
+   }
+
+   @Override
+   public void setMargin(float topBottom, float rightLeft) {
+      this.marginTop = topBottom;
+      this.marginRight = rightLeft;
+      this.marginBottom = topBottom;
+      this.marginLeft = rightLeft;
+   }
+
+   @Override
+   public void setMargin(float all) {
+      this.marginTop = all;
+      this.marginRight = all;
+      this.marginBottom = all;
+      this.marginLeft = all;
+   }
+
+   @Override
+   public void setMarginTop(float margin) {
+      this.marginTop = margin;
+   }
+
+   @Override
+   public void setMarginRight(float margin) {
+      this.marginRight = margin;
+   }
+
+   @Override
+   public void setMarginBottom(float margin) {
+      this.marginBottom = margin;
+   }
+
+   @Override
+   public void setMarginLeft(float margin) {
+      this.marginLeft = margin;
+   }
+
+   @Override
+   public float getMarginTop() {
+      return marginTop;
+   }
+
+   @Override
+   public float getMarginRight() {
+      return marginRight;
+   }
+
+   @Override
+   public float getMarginBottom() {
+      return marginBottom;
+   }
+
+   @Override
+   public float getMarginLeft() {
+      return marginLeft;
+   }
+
+   @Override
+   public void setPadding(float top, float right, float bottom, float left) {
+      this.paddingTop = top;
+      this.paddingRight = right;
+      this.paddingBottom = bottom;
+      this.paddingLeft = left;
+   }
+
+   @Override
+   public void setPadding(float top, float rightLeft, float bottom) {
+      this.paddingTop = top;
+      this.paddingRight = rightLeft;
+      this.paddingBottom = bottom;
+      this.paddingLeft = rightLeft;
+   }
+
+   @Override
+   public void setPadding(float topBottom, float rightLeft) {
+      this.paddingTop = topBottom;
+      this.paddingRight = rightLeft;
+      this.paddingBottom = topBottom;
+      this.paddingLeft = rightLeft;
+   }
+
+   @Override
+   public void setPadding(float all) {
+      this.paddingTop = all;
+      this.paddingRight = all;
+      this.paddingBottom = all;
+      this.paddingLeft = all;
+   }
+
+   @Override
+   public void setPaddingTop(float padding) {
+      this.paddingTop = padding;
+   }
+
+   @Override
+   public void setPaddingRight(float padding) {
+      this.paddingRight = padding;
+   }
+
+   @Override
+   public void setPaddingBottom(float padding) {
+      this.paddingBottom = padding;
+   }
+
+   @Override
+   public void setPaddingLeft(float padding) {
+      this.paddingLeft = padding;
+   }
+
+   @Override
+   public float getPaddingTop() {
+      return paddingTop;
+   }
+
+   @Override
+   public float getPaddingRight() {
+      return paddingRight;
+   }
+
+   @Override
+   public float getPaddingBottom() {
+      return paddingBottom;
+   }
+
+   @Override
+   public float getPaddingLeft() {
+      return paddingLeft;
+   }
+}
diff --git a/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/base/Widget.java b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/base/Widget.java
index ac7725a6..103ac055 100644
--- a/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/base/Widget.java
+++ b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/base/Widget.java
@@ -19,8 +19,12 @@ public interface Widget {
 
    float getWidth();
 
+   float getActualWidth();
+
    float getHeight();
 
+   float getActualHeight();
+
    void setWidth(float width);
 
    void setHeight(float height);
diff --git a/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/component/BaseComponent.java b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/component/BaseComponent.java
new file mode 100644
index 00000000..28e154a7
--- /dev/null
+++ b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/component/BaseComponent.java
@@ -0,0 +1,6 @@
+package com.bartlomiejpluta.base.api.game.gui.component;
+
+import com.bartlomiejpluta.base.api.game.gui.base.BaseWidget;
+
+public abstract class BaseComponent extends BaseWidget implements Component {
+}
diff --git a/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/component/BaseContainer.java b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/component/BaseContainer.java
index 4b449f93..9a45ee5d 100644
--- a/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/component/BaseContainer.java
+++ b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/component/BaseContainer.java
@@ -3,7 +3,7 @@ package com.bartlomiejpluta.base.api.game.gui.component;
 import java.util.LinkedList;
 import java.util.List;
 
-public abstract class BaseContainer extends Component implements Container {
+public abstract class BaseContainer extends BaseComponent implements Container {
    protected final List<Component> children = new LinkedList<>();
 
    @Override
diff --git a/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/component/Component.java b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/component/Component.java
index 65081c2b..cd58947d 100644
--- a/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/component/Component.java
+++ b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/component/Component.java
@@ -1,275 +1,6 @@
 package com.bartlomiejpluta.base.api.game.gui.component;
 
-import com.bartlomiejpluta.base.api.game.gui.base.SizeMode;
 import com.bartlomiejpluta.base.api.game.gui.base.Widget;
 
-public abstract class Component implements Widget {
-   protected Widget parent;
-
-   protected SizeMode widthMode = SizeMode.NORMAL;
-   protected SizeMode heightMode = SizeMode.NORMAL;
-
-   protected float x;
-   protected float y;
-
-   protected float width;
-   protected float height;
-
-   protected float marginTop;
-   protected float marginRight;
-   protected float marginBottom;
-   protected float marginLeft;
-
-   protected float paddingTop;
-   protected float paddingRight;
-   protected float paddingBottom;
-   protected float paddingLeft;
-
-   protected abstract float getContentWidth();
-
-   protected abstract float getContentHeight();
-
-   @Override
-   public float getWidth() {
-      return widthMode == SizeMode.MATCH_PARENT
-            ? (parent != null ? parent.getWidth() : 0)
-            : getActualWidth();
-   }
-
-   protected float getActualWidth() {
-      return paddingLeft + (widthMode == SizeMode.NORMAL ? width : getContentWidth()) + paddingRight;
-   }
-
-   @Override
-   public float getHeight() {
-      return heightMode == SizeMode.MATCH_PARENT
-            ? (parent != null ? parent.getHeight() : 0)
-            : getActualHeight();
-   }
-
-   protected float getActualHeight() {
-      return paddingTop + (heightMode == SizeMode.NORMAL ? height : getContentHeight()) + paddingBottom;
-   }
-
-   @Override
-   public void setWidth(float width) {
-      this.width = width;
-   }
-
-   @Override
-   public void setHeight(float height) {
-      this.height = height;
-   }
-
-   @Override
-   public void setSize(float width, float height) {
-      this.width = width;
-      this.height = height;
-   }
-
-   @Override
-   public void setSizeMode(SizeMode widthMode, SizeMode heightMode) {
-      this.widthMode = widthMode;
-      this.heightMode = heightMode;
-   }
-
-   @Override
-   public SizeMode getWidthMode() {
-      return widthMode;
-   }
-
-   @Override
-   public void setWidthMode(SizeMode mode) {
-      this.widthMode = mode;
-   }
-
-   @Override
-   public SizeMode getHeightMode() {
-      return heightMode;
-   }
-
-   @Override
-   public void setHeightMode(SizeMode mode) {
-      this.heightMode = mode;
-   }
-
-   @Override
-   public Widget getParent() {
-      return parent;
-   }
-
-   @Override
-   public void setParent(Widget parent) {
-      this.parent = parent;
-   }
-
-   @Override
-   public float getX() {
-      return x;
-   }
-
-   @Override
-   public float getY() {
-      return y;
-   }
-
-   @Override
-   public void setX(float x) {
-      this.x = x;
-   }
-
-   @Override
-   public void setY(float y) {
-      this.y = y;
-   }
-
-   @Override
-   public void setPosition(float x, float y) {
-      this.x = x;
-      this.y = y;
-   }
-
-   @Override
-   public void setMargin(float top, float right, float bottom, float left) {
-      this.marginTop = top;
-      this.marginRight = right;
-      this.marginBottom = bottom;
-      this.marginLeft = left;
-   }
-
-   @Override
-   public void setMargin(float top, float rightLeft, float bottom) {
-      this.marginTop = top;
-      this.marginRight = rightLeft;
-      this.marginBottom = bottom;
-      this.marginLeft = rightLeft;
-   }
-
-   @Override
-   public void setMargin(float topBottom, float rightLeft) {
-      this.marginTop = topBottom;
-      this.marginRight = rightLeft;
-      this.marginBottom = topBottom;
-      this.marginLeft = rightLeft;
-   }
-
-   @Override
-   public void setMargin(float all) {
-      this.marginTop = all;
-      this.marginRight = all;
-      this.marginBottom = all;
-      this.marginLeft = all;
-   }
-
-   @Override
-   public void setMarginTop(float margin) {
-      this.marginTop = margin;
-   }
-
-   @Override
-   public void setMarginRight(float margin) {
-      this.marginRight = margin;
-   }
-
-   @Override
-   public void setMarginBottom(float margin) {
-      this.marginBottom = margin;
-   }
-
-   @Override
-   public void setMarginLeft(float margin) {
-      this.marginLeft = margin;
-   }
-
-   @Override
-   public float getMarginTop() {
-      return marginTop;
-   }
-
-   @Override
-   public float getMarginRight() {
-      return marginRight;
-   }
-
-   @Override
-   public float getMarginBottom() {
-      return marginBottom;
-   }
-
-   @Override
-   public float getMarginLeft() {
-      return marginLeft;
-   }
-
-   @Override
-   public void setPadding(float top, float right, float bottom, float left) {
-      this.paddingTop = top;
-      this.paddingRight = right;
-      this.paddingBottom = bottom;
-      this.paddingLeft = left;
-   }
-
-   @Override
-   public void setPadding(float top, float rightLeft, float bottom) {
-      this.paddingTop = top;
-      this.paddingRight = rightLeft;
-      this.paddingBottom = bottom;
-      this.paddingLeft = rightLeft;
-   }
-
-   @Override
-   public void setPadding(float topBottom, float rightLeft) {
-      this.paddingTop = topBottom;
-      this.paddingRight = rightLeft;
-      this.paddingBottom = topBottom;
-      this.paddingLeft = rightLeft;
-   }
-
-   @Override
-   public void setPadding(float all) {
-      this.paddingTop = all;
-      this.paddingRight = all;
-      this.paddingBottom = all;
-      this.paddingLeft = all;
-   }
-
-   @Override
-   public void setPaddingTop(float padding) {
-      this.paddingTop = padding;
-   }
-
-   @Override
-   public void setPaddingRight(float padding) {
-      this.paddingRight = padding;
-   }
-
-   @Override
-   public void setPaddingBottom(float padding) {
-      this.paddingBottom = padding;
-   }
-
-   @Override
-   public void setPaddingLeft(float padding) {
-      this.paddingLeft = padding;
-   }
-
-   @Override
-   public float getPaddingTop() {
-      return paddingTop;
-   }
-
-   @Override
-   public float getPaddingRight() {
-      return paddingRight;
-   }
-
-   @Override
-   public float getPaddingBottom() {
-      return paddingBottom;
-   }
-
-   @Override
-   public float getPaddingLeft() {
-      return paddingLeft;
-   }
+public interface Component extends Widget {
 }
diff --git a/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/component/Container.java b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/component/Container.java
index ecb8aeba..2c86d1c4 100644
--- a/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/component/Container.java
+++ b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/component/Container.java
@@ -1,8 +1,6 @@
 package com.bartlomiejpluta.base.api.game.gui.component;
 
-import com.bartlomiejpluta.base.api.game.gui.base.Widget;
-
-public interface Container extends Widget {
+public interface Container extends Component {
    void add(Component component);
 
    void remove(Component component);
diff --git a/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/window/BaseWindow.java b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/window/BaseWindow.java
new file mode 100644
index 00000000..3ea9a318
--- /dev/null
+++ b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/window/BaseWindow.java
@@ -0,0 +1,28 @@
+package com.bartlomiejpluta.base.api.game.gui.window;
+
+import com.bartlomiejpluta.base.api.game.gui.base.BaseWidget;
+import com.bartlomiejpluta.base.api.game.gui.component.Component;
+
+public abstract class BaseWindow extends BaseWidget implements Window {
+   protected Component content;
+
+   @Override
+   protected float getContentWidth() {
+      return content.getMarginLeft() + content.getActualWidth() + content.getMarginRight();
+   }
+
+   @Override
+   protected float getContentHeight() {
+      return content.getMarginTop() + content.getActualHeight() + content.getMarginBottom();
+   }
+
+   @Override
+   public void onOpen(WindowManager manager) {
+      // do nothing
+   }
+
+   @Override
+   public void onClose(WindowManager manager) {
+      // do nothing
+   }
+}
diff --git a/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/window/DefaultWindowManager.java b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/window/DefaultWindowManager.java
new file mode 100644
index 00000000..4c1b2278
--- /dev/null
+++ b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/window/DefaultWindowManager.java
@@ -0,0 +1,84 @@
+package com.bartlomiejpluta.base.api.game.gui.window;
+
+import com.bartlomiejpluta.base.api.game.gui.base.BaseWidget;
+import com.bartlomiejpluta.base.api.game.gui.base.GUI;
+import com.bartlomiejpluta.base.api.game.gui.base.SizeMode;
+import com.bartlomiejpluta.base.api.game.screen.Screen;
+
+import java.util.Deque;
+import java.util.LinkedList;
+
+import static java.util.Objects.requireNonNull;
+
+public class DefaultWindowManager extends BaseWidget implements WindowManager {
+   private final Deque<Window> windows = new LinkedList<>();
+   private DisplayMode displayMode = DisplayMode.DISPLAY_STACK;
+
+   public DefaultWindowManager() {
+      super.setSizeMode(SizeMode.MATCH_PARENT, SizeMode.MATCH_PARENT);
+   }
+
+   @Override
+   protected float getContentWidth() {
+      return 0;
+   }
+
+   @Override
+   protected float getContentHeight() {
+      return 0;
+   }
+
+   @Override
+   public void setSizeMode(SizeMode widthMode, SizeMode heightMode) {
+      throw new UnsupportedOperationException("Window Manager is hardcoded to be of MATCH_PARENT mode");
+   }
+
+   @Override
+   public void setWidthMode(SizeMode mode) {
+      throw new UnsupportedOperationException("Window Manager is hardcoded to be of MATCH_PARENT mode");
+   }
+
+   @Override
+   public void setHeightMode(SizeMode mode) {
+      throw new UnsupportedOperationException("Window Manager is hardcoded to be of MATCH_PARENT mode");
+   }
+
+   @Override
+   public void setDisplayMode(DisplayMode mode) {
+      this.displayMode = requireNonNull(mode);
+   }
+
+   @Override
+   public void open(Window window) {
+      requireNonNull(window, "Window cannot be null");
+
+      windows.push(window);
+      window.setParent(this);
+      window.onOpen(this);
+   }
+
+   @Override
+   public void close() {
+      var window = windows.pop();
+      window.setParent(null);
+      window.onClose(this);
+   }
+
+   @Override
+   public void draw(Screen screen, GUI gui) {
+      switch (displayMode) {
+         case DISPLAY_STACK -> {
+            for (var window : windows) {
+               window.draw(screen, gui);
+            }
+         }
+
+         case DISPLAY_TOP -> {
+            var topWindow = windows.peekFirst();
+            if (topWindow != null) {
+               topWindow.draw(screen, gui);
+            }
+         }
+      }
+   }
+}
diff --git a/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/window/DisplayMode.java b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/window/DisplayMode.java
new file mode 100644
index 00000000..b657b39f
--- /dev/null
+++ b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/window/DisplayMode.java
@@ -0,0 +1,6 @@
+package com.bartlomiejpluta.base.api.game.gui.window;
+
+public enum DisplayMode {
+   DISPLAY_STACK,
+   DISPLAY_TOP
+}
diff --git a/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/window/Window.java b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/window/Window.java
new file mode 100644
index 00000000..eef310ff
--- /dev/null
+++ b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/window/Window.java
@@ -0,0 +1,9 @@
+package com.bartlomiejpluta.base.api.game.gui.window;
+
+import com.bartlomiejpluta.base.api.game.gui.base.Widget;
+
+public interface Window extends Widget {
+   void onOpen(WindowManager manager);
+
+   void onClose(WindowManager manager);
+}
diff --git a/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/window/WindowManager.java b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/window/WindowManager.java
new file mode 100644
index 00000000..8b1132aa
--- /dev/null
+++ b/api/src/main/java/com/bartlomiejpluta/base/api/game/gui/window/WindowManager.java
@@ -0,0 +1,11 @@
+package com.bartlomiejpluta.base.api.game.gui.window;
+
+import com.bartlomiejpluta.base.api.game.gui.base.Widget;
+
+public interface WindowManager extends Widget {
+   void setDisplayMode(DisplayMode mode);
+
+   void open(Window window);
+
+   void close();
+}
diff --git a/engine/src/main/java/com/bartlomiejpluta/base/engine/gui/widget/ScreenWidget.java b/engine/src/main/java/com/bartlomiejpluta/base/engine/gui/widget/ScreenWidget.java
index 6d5e62bf..4e3ee620 100644
--- a/engine/src/main/java/com/bartlomiejpluta/base/engine/gui/widget/ScreenWidget.java
+++ b/engine/src/main/java/com/bartlomiejpluta/base/engine/gui/widget/ScreenWidget.java
@@ -21,11 +21,21 @@ public class ScreenWidget implements Widget {
       return screen.getWidth();
    }
 
+   @Override
+   public float getActualWidth() {
+      return screen.getWidth();
+   }
+
    @Override
    public float getHeight() {
       return screen.getHeight();
    }
 
+   @Override
+   public float getActualHeight() {
+      return screen.getWidth();
+   }
+
    @Override
    public Widget getParent() {
       return null;