diff --git a/app/src/main/java/com/example/jnicpp/bowling/AdminAuth.kt b/app/src/main/java/com/example/jnicpp/bowling/AdminAuth.kt
new file mode 100644
index 0000000..025f97c
--- /dev/null
+++ b/app/src/main/java/com/example/jnicpp/bowling/AdminAuth.kt
@@ -0,0 +1,31 @@
+/**
+ * @file AdminAuth.kt
+ * @brief Minimal local admin/normal-user distinction gating access to the tuning screen.
+ */
+package com.example.jnicpp.bowling
+
+/**
+ * @brief Recognizes an admin login vs. a normal user for this local tool.
+ *
+ * Deliberately not a real multi-user account system -- there's no backend
+ * and no per-user data anywhere in this app. Just a single admin password
+ * checked locally: entering it correctly (see
+ * [BowlingCameraActivity]'s Tuning button) recognizes that login attempt
+ * as admin and unlocks [ParameterEditorActivity] for it; anyone who
+ * doesn't enter it stays a normal user with no access. Not persisted
+ * across app restarts or Tuning taps -- each attempt is checked fresh.
+ */
+object AdminAuth {
+    // Change this to your own value if you want a different admin
+    // password. Plain-text on purpose: this only gates a local tuning
+    // screen, not anything sensitive, so hashing/storage machinery would
+    // be complexity this tool doesn't need.
+    private const val ADMIN_PASSWORD = "admin123"
+
+    /**
+     * @brief Whether [password] matches the admin password.
+     * @param password The password entered at the login prompt.
+     * @return true if this login attempt should be recognized as admin.
+     */
+    fun isAdminPassword(password: String): Boolean = password == ADMIN_PASSWORD
+}
diff --git a/app/src/main/java/com/example/jnicpp/bowling/AdminLoginPrompt.kt b/app/src/main/java/com/example/jnicpp/bowling/AdminLoginPrompt.kt
new file mode 100644
index 0000000..4f44f61
--- /dev/null
+++ b/app/src/main/java/com/example/jnicpp/bowling/AdminLoginPrompt.kt
@@ -0,0 +1,53 @@
+/**
+ * @file AdminLoginPrompt.kt
+ * @brief Dialog that gates admin-only actions behind AdminAuth's password check.
+ */
+package com.example.jnicpp.bowling
+
+import android.content.Context
+import android.text.InputType
+import android.widget.EditText
+import android.widget.Toast
+import androidx.appcompat.app.AlertDialog
+import com.example.jnicpp.R
+
+/**
+ * @brief Shows the admin-login dialog used to gate [ParameterEditorActivity].
+ *
+ * Pulled out of [BowlingCameraActivity] so that Activity stays limited to
+ * wiring user actions into this rather than holding dialog-building and
+ * password-checking logic itself -- same reasoning as
+ * [StepCounterUiController].
+ */
+object AdminLoginPrompt {
+
+    /**
+     * @brief Prompts for the admin password and invokes [onSuccess] only
+     *        if it matches [AdminAuth]'s admin password; otherwise shows a
+     *        "staying in normal user mode" toast and does nothing further.
+     * @param context Used to build the dialog and its toast.
+     * @param onSuccess Invoked once the entered password is confirmed correct.
+     */
+    fun show(context: Context, onSuccess: () -> Unit) {
+        val passwordInput = EditText(context).apply {
+            inputType = InputType.TYPE_CLASS_TEXT or InputType.TYPE_TEXT_VARIATION_PASSWORD
+            hint = context.getString(R.string.admin_password_hint)
+        }
+        val paddingPx = (16 * context.resources.displayMetrics.density).toInt()
+        passwordInput.setPadding(paddingPx, paddingPx, paddingPx, paddingPx)
+
+        AlertDialog.Builder(context)
+            .setTitle(R.string.admin_login_title)
+            .setMessage(R.string.admin_login_message)
+            .setView(passwordInput)
+            .setPositiveButton(R.string.admin_login_confirm) { _, _ ->
+                if (AdminAuth.isAdminPassword(passwordInput.text.toString())) {
+                    onSuccess()
+                } else {
+                    Toast.makeText(context, R.string.admin_login_failed, Toast.LENGTH_SHORT).show()
+                }
+            }
+            .setNegativeButton(R.string.admin_login_cancel, null)
+            .show()
+    }
+}
diff --git a/app/src/main/java/com/example/jnicpp/bowling/BowlingCameraActivity.kt b/app/src/main/java/com/example/jnicpp/bowling/BowlingCameraActivity.kt
index fa47629..fa4e873 100644
--- a/app/src/main/java/com/example/jnicpp/bowling/BowlingCameraActivity.kt
+++ b/app/src/main/java/com/example/jnicpp/bowling/BowlingCameraActivity.kt
@@ -109,7 +109,11 @@ class BowlingCameraActivity : AppCompatActivity(), CameraXController.Callback {
         binding.switchPose.setOnCheckedChangeListener { _, isChecked -> viewModel.onPoseToggled(isChecked) }
         binding.btnSwitchCamera.setOnClickListener { onSwitchCameraClicked() }
         binding.btnBack.setOnClickListener { finish() }
-        binding.btnEditor.setOnClickListener { startActivity(Intent(this, ParameterEditorActivity::class.java)) }
+        binding.btnEditor.setOnClickListener {
+            AdminLoginPrompt.show(this) {
+                startActivity(Intent(this, ParameterEditorActivity::class.java))
+            }
+        }
 
         observeViewModel()
 
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 2dfb0a5..33f3b42 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -20,6 +20,12 @@
     <string name="error_recording_failed">Recording failed: %1$s</string>
     <string name="error_pose_detector">Pose detector error: %1$s</string>
     <string name="editor_button">Tuning</string>
+    <string name="admin_login_title">Admin login</string>
+    <string name="admin_login_message">Enter the admin password to access tuning settings.</string>
+    <string name="admin_password_hint">Password</string>
+    <string name="admin_login_confirm">Log in</string>
+    <string name="admin_login_cancel">Cancel</string>
+    <string name="admin_login_failed">Incorrect password — staying in normal user mode.</string>
 
     <!-- Parameter editor screen -->
     <string name="editor_title">Step Detection Tuning</string>