diff --git a/android/app/src/main/AndroidManifest.xml b/android/app/src/main/AndroidManifest.xml
index 2215c48ddc..ea7ff550a7 100644
--- a/android/app/src/main/AndroidManifest.xml
+++ b/android/app/src/main/AndroidManifest.xml
@@ -11,7 +11,7 @@
 
     <activity
       android:name=".LauncherActivity"
-      android:screenOrientation="fullSensor"
+      android:screenOrientation="portrait"
       android:exported="true">
 
       <intent-filter>
@@ -35,7 +35,7 @@
 
     <activity
       android:name=".MainActivity"
-      android:screenOrientation="sensorLandscape"
+      android:screenOrientation="landscape"
       android:configChanges="keyboard|keyboardHidden|orientation|screenSize|screenLayout|smallestScreenSize|uiMode"
       android:hardwareAccelerated="true"
       android:process=":xemu"
@@ -48,17 +48,17 @@
 
     <activity
       android:name=".SetupWizardActivity"
-      android:screenOrientation="fullSensor"
+      android:screenOrientation="portrait"
       android:exported="false" />
 
     <activity
       android:name=".GameLibraryActivity"
-      android:screenOrientation="fullSensor"
+      android:screenOrientation="portrait"
       android:exported="false" />
 
     <activity
       android:name=".SettingsActivity"
-      android:screenOrientation="fullSensor"
+      android:screenOrientation="portrait"
       android:exported="false" />
 
   </application>
diff --git a/android/app/src/main/java/com/izzy2lost/x1box/GameLibraryActivity.kt b/android/app/src/main/java/com/izzy2lost/x1box/GameLibraryActivity.kt
index 3a1a9256bc..56e93c1bd8 100644
--- a/android/app/src/main/java/com/izzy2lost/x1box/GameLibraryActivity.kt
+++ b/android/app/src/main/java/com/izzy2lost/x1box/GameLibraryActivity.kt
@@ -151,6 +151,7 @@ class GameLibraryActivity : AppCompatActivity() {
 
   override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)
+    OrientationLocker(this).enable()
     setContentView(R.layout.activity_game_library)
     EdgeToEdgeHelper.enable(this)
     EdgeToEdgeHelper.applySystemBarPadding(findViewById(R.id.library_scroll))
diff --git a/android/app/src/main/java/com/izzy2lost/x1box/LauncherActivity.kt b/android/app/src/main/java/com/izzy2lost/x1box/LauncherActivity.kt
index 3104095353..037fd496ed 100644
--- a/android/app/src/main/java/com/izzy2lost/x1box/LauncherActivity.kt
+++ b/android/app/src/main/java/com/izzy2lost/x1box/LauncherActivity.kt
@@ -15,6 +15,7 @@ class LauncherActivity : Activity() {
 
   override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)
+    OrientationLocker(this).enable()
 
     val prefs = getSharedPreferences("x1box_prefs", MODE_PRIVATE)
     var setupComplete = prefs.getBoolean("setup_complete", false)
diff --git a/android/app/src/main/java/com/izzy2lost/x1box/MainActivity.kt b/android/app/src/main/java/com/izzy2lost/x1box/MainActivity.kt
index dc45fc4a3f..6f0c25a476 100644
--- a/android/app/src/main/java/com/izzy2lost/x1box/MainActivity.kt
+++ b/android/app/src/main/java/com/izzy2lost/x1box/MainActivity.kt
@@ -78,6 +78,7 @@ class MainActivity : SDLActivity(), InputManager.InputDeviceListener {
 
   override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)
+    OrientationLocker(this, landscapeOnly = true).enable()
     window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
     val requestedSlot = intent?.getIntExtra(EXTRA_AUTO_LOAD_SNAPSHOT_SLOT, 0) ?: 0
     if (requestedSlot in 1..TOTAL_SNAPSHOT_SLOTS) {
diff --git a/android/app/src/main/java/com/izzy2lost/x1box/OrientationLocker.kt b/android/app/src/main/java/com/izzy2lost/x1box/OrientationLocker.kt
new file mode 100644
index 0000000000..343e6f09e3
--- /dev/null
+++ b/android/app/src/main/java/com/izzy2lost/x1box/OrientationLocker.kt
@@ -0,0 +1,45 @@
+package com.izzy2lost.x1box
+
+import android.app.Activity
+import android.content.pm.ActivityInfo
+import android.view.OrientationEventListener
+
+/**
+ * Prevents reversed (upside-down) orientations.
+ *
+ * UI mode:  portrait when upright/right-rotated, left landscape otherwise.
+ * Game mode: always left landscape, no exceptions.
+ */
+class OrientationLocker(private val activity: Activity, private val landscapeOnly: Boolean = false) {
+
+    private val listener = object : OrientationEventListener(activity) {
+        override fun onOrientationChanged(orientation: Int) {
+            if (orientation == ORIENTATION_UNKNOWN) return
+
+            val target = if (landscapeOnly) {
+                // In-game: always left landscape regardless of how the device is held.
+                ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE
+            } else {
+                // UI: portrait when upright or rotating right, landscape otherwise.
+                //   315-360 / 0-134  → portrait (upright + right rotation)
+                //   135-314           → landscape (upside-down + left rotation)
+                if (orientation < 135 || orientation >= 315)
+                    ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
+                else
+                    ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE
+            }
+
+            if (activity.requestedOrientation != target) {
+                activity.requestedOrientation = target
+            }
+        }
+    }
+
+    fun enable() {
+        if (listener.canDetectOrientation()) listener.enable()
+    }
+
+    fun disable() {
+        listener.disable()
+    }
+}
diff --git a/android/app/src/main/java/com/izzy2lost/x1box/SettingsActivity.kt b/android/app/src/main/java/com/izzy2lost/x1box/SettingsActivity.kt
index 64cd9285fd..c3dfb623b7 100644
--- a/android/app/src/main/java/com/izzy2lost/x1box/SettingsActivity.kt
+++ b/android/app/src/main/java/com/izzy2lost/x1box/SettingsActivity.kt
@@ -207,6 +207,7 @@ class SettingsActivity : AppCompatActivity() {
 
   override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)
+    OrientationLocker(this).enable()
     setContentView(R.layout.activity_settings)
     EdgeToEdgeHelper.enable(this)
     EdgeToEdgeHelper.applySystemBarPadding(findViewById(R.id.settings_scroll))
diff --git a/android/app/src/main/java/com/izzy2lost/x1box/SetupWizardActivity.kt b/android/app/src/main/java/com/izzy2lost/x1box/SetupWizardActivity.kt
index bb72e73eda..77d892ab54 100644
--- a/android/app/src/main/java/com/izzy2lost/x1box/SetupWizardActivity.kt
+++ b/android/app/src/main/java/com/izzy2lost/x1box/SetupWizardActivity.kt
@@ -152,6 +152,7 @@ class SetupWizardActivity : AppCompatActivity() {
 
   override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)
+    OrientationLocker(this).enable()
 
     mcpxPath = loadValidatedLocalPath("mcpxPath", "mcpxUri", ::isSavedMcpxFileValid)
     flashPath = loadValidatedLocalPath("flashPath", "flashUri", ::isSavedFlashFileValid)