diff --git a/js/ui.js b/js/ui.js
index 4f4088b..17a03f9 100644
--- a/js/ui.js
+++ b/js/ui.js
@@ -13,6 +13,7 @@ export class UIManager {
     this.bindEvents();
     this.syncSlidersFromConfig();
     this.updateAudioButtons();
+    this.applyURLParams();
   }
 
   cacheDOMElements() {
@@ -326,7 +327,8 @@ export class UIManager {
 
     // Keyboard ESC & browser fullscreenchange listener
     document.addEventListener('fullscreenchange', () => {
-      if (!document.fullscreenElement && this.isFullscreen) {
+      if (!document.fullscreenElement && this.hadDOMFullscreen) {
+        this.hadDOMFullscreen = false;
         this.exitFullscreen(false);
       }
     });
@@ -371,7 +373,47 @@ export class UIManager {
     }
   }
 
-  enterFullscreen() {
+  applyURLParams() {
+    try {
+      const params = new URLSearchParams(window.location.search);
+      const isScreensaver = params.get('screensaver') === '1' || params.get('screensaver') === 'true' ||
+                            params.get('wallpaper') === '1' || params.get('wallpaper') === 'true';
+      const isFullscreen = isScreensaver || params.get('fullscreen') === '1' || params.get('fullscreen') === 'true';
+      const isContinuous = isScreensaver || params.get('continuous') === '1' || params.get('continuous') === 'true';
+
+      if (isContinuous) {
+        if (this.checkContinuous) {
+          this.checkContinuous.checked = true;
+        }
+        this.sim.config.continuousMode = true;
+        this.configManager.save({ continuousMode: true });
+      }
+
+      if (isFullscreen) {
+        setTimeout(() => {
+          this.enterFullscreen(false);
+        }, 120);
+      }
+
+      if (params.get('sound') === '0' || params.get('mute') === '1') {
+        if (this.sim.audio && this.sim.audio.sfxEnabled) {
+          this.sim.audio.toggleSfx();
+          this.updateAudioButtons();
+        }
+      }
+
+      if (params.get('music') === '1') {
+        if (this.sim.audio && !this.sim.audio.musicEnabled) {
+          this.sim.audio.toggleMusic();
+          this.updateAudioButtons();
+        }
+      }
+    } catch (e) {
+      console.warn('URL params check skipped:', e);
+    }
+  }
+
+  enterFullscreen(requestDOMFullscreen = true) {
     this.isFullscreen = true;
     const appLayout = document.querySelector('.app-layout');
     if (appLayout) {
@@ -381,8 +423,12 @@ export class UIManager {
       this.btnExitFullscreen.classList.remove('hidden');
     }
 
-    if (document.documentElement.requestFullscreen && !document.fullscreenElement) {
-      document.documentElement.requestFullscreen().catch(() => {});
+    if (requestDOMFullscreen && document.documentElement.requestFullscreen && !document.fullscreenElement) {
+      document.documentElement.requestFullscreen().then(() => {
+        this.hadDOMFullscreen = true;
+      }).catch(() => {
+        this.hadDOMFullscreen = false;
+      });
     }
 
     setTimeout(() => {
@@ -392,6 +438,7 @@ export class UIManager {
 
   exitFullscreen(requestExit = true) {
     this.isFullscreen = false;
+    this.hadDOMFullscreen = false;
     const appLayout = document.querySelector('.app-layout');
     if (appLayout) {
       appLayout.classList.remove('fullscreen-mode');