Enhance: Update Google Play Games integration and versioning

- Incremented version code to 5 and version name to 0.4 in build.gradle.
- Removed Google Play sign-in buttons from both portrait and landscape layouts.
- Updated HighScoresActivity to hide the leaderboard button.
- Improved score submission process in GooglePlayGamesManager with forced sign-in and user feedback.
- Enhanced MainActivity to submit scores to Google Play Games upon game over.

README.md

@@ -11,6 +11,7 @@ A modern falling block puzzle game for Android, featuring smooth animations, res
 - Hard drop and soft drop controls
 - Advanced move detection (e.g., T-Spins) and scoring
 - Persistent high score system (Top 5)
+- Global leaderboard via Google Play Games Services
 
 ### Modern Android Features
 - Optimized for Android 11+ (API 30+)
@@ -20,6 +21,7 @@ A modern falling block puzzle game for Android, featuring smooth animations, res
 - Automatic Dark theme support
 - Intuitive and responsive touch controls
 - Full edge-to-edge display utilization
+- Google Play Games Services integration for leaderboards
 
 ### Scoring System
 
@@ -74,6 +76,12 @@ Pixelmint Drop features a comprehensive scoring system designed to reward skillf
 - Multiple theme options with ability to change manually or enable Random Mode (unlocked when 2+ themes are available).
 - In Random Mode, themes change automatically every 10 line clears (1 level).
 
+### Online Features
+- Global leaderboard support through Google Play Games Services
+- Sign in with your Google account to compete with players worldwide
+- Your highest scores are automatically submitted to the leaderboard
+- View the global leaderboard directly from the game
+
 ## Technical Details
 
 ### Requirements

app/build.gradle

@@ -11,8 +11,8 @@ android {
         applicationId "com.pixelmintdrop"
         minSdk 30
         targetSdk 35
-        versionCode 2
+        versionCode 5
-        versionName "0.1"
+        versionName "0.4"
         
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
@@ -63,6 +63,8 @@ dependencies {
     implementation 'androidx.window:window:1.2.0'  // For better display support
     implementation 'androidx.window:window-java:1.2.0'
     implementation 'com.google.code.gson:gson:2.10.1'
+    implementation 'com.google.android.gms:play-services-games-v2:19.0.0'
+    implementation 'com.google.android.gms:play-services-auth:20.7.0'
     testImplementation 'junit:junit:4.13.2'
     androidTestImplementation 'androidx.test.ext:junit:1.1.5'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'

app/src/main/AndroidManifest.xml

@@ -2,6 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <uses-permission android:name="android.permission.VIBRATE" />
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <!-- Add permission to handle system gestures if needed on some devices -->
 
     <application
@@ -11,6 +13,12 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.pixelmintdrop">
+        <meta-data
+            android:name="com.google.android.gms.games.APP_ID"
+            android:value="@string/app_id" />
+        <meta-data
+            android:name="com.google.android.gms.version"
+            android:value="@integer/google_play_services_version" />
         <activity
             android:name=".MainActivity"
             android:exported="true"

app/src/main/java/com/pixelmintdrop/HighScoresActivity.kt

@@ -7,15 +7,18 @@ import com.pixelmintdrop.databinding.HighScoresBinding
 import com.pixelmintdrop.model.HighScoreAdapter
 import com.pixelmintdrop.model.HighScoreManager
 import com.pixelmintdrop.model.PlayerProgressionManager
+import com.pixelmintdrop.model.GooglePlayGamesManager
 import android.graphics.Color
 import android.util.Log
 import android.view.KeyEvent
 import android.view.InputDevice
 import android.graphics.Rect
 import android.view.View
+import android.widget.Toast
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
 import androidx.core.view.updatePadding
+import android.content.Intent
 
 class HighScoresActivity : AppCompatActivity() {
     private lateinit var binding: HighScoresBinding
@@ -24,6 +27,10 @@ class HighScoresActivity : AppCompatActivity() {
     private lateinit var progressionManager: PlayerProgressionManager
     private var currentTheme = PlayerProgressionManager.THEME_CLASSIC
     
+    companion object {
+        private const val RC_LEADERBOARD_UI_HS = 9005 // Unique request code for HighScoresActivity
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         
@@ -68,6 +75,9 @@ class HighScoresActivity : AppCompatActivity() {
             binding.backButton.setOnClickListener {
                 finish()
             }
+            
+            // Hide the leaderboard button
+            binding.leaderboardButton?.visibility = View.GONE
         } catch (e: Exception) {
             Log.e("HighScoresActivity", "Error in onCreate", e)
             // Show an error message if necessary, or finish gracefully
@@ -104,7 +114,7 @@ class HighScoresActivity : AppCompatActivity() {
                 else -> Color.WHITE
             }
     
-            // Apply theme to back button
+            // Apply theme to buttons
             binding.backButton.setTextColor(textColor)
     
             // Update adapter theme
@@ -123,6 +133,35 @@ class HighScoresActivity : AppCompatActivity() {
         }
     }
     
+    private fun showGlobalLeaderboard() {
+        try {
+            if (!highScoreManager.isGooglePlaySignedIn()) {
+                Toast.makeText(this, "Signing in to Google Play Games...", Toast.LENGTH_SHORT).show()
+            }
+            
+            // Call the updated showLeaderboard with a listener
+            highScoreManager.getGooglePlayGamesManager().showLeaderboard(this, 
+                object : GooglePlayGamesManager.LeaderboardIntentListener {
+                    override fun onLeaderboardIntentSuccess(intent: Intent) {
+                        try {
+                            startActivityForResult(intent, RC_LEADERBOARD_UI_HS)
+                        } catch (e: Exception) {
+                            Log.e("HighScoresActivity", "Failed to start leaderboard activity for result", e)
+                            Toast.makeText(this@HighScoresActivity, "Could not display leaderboard.", Toast.LENGTH_SHORT).show()
+                        }
+                    }
+
+                    override fun onLeaderboardIntentFailure(exception: Exception) {
+                        Log.e("HighScoresActivity", "Failed to get leaderboard intent.", exception)
+                        Toast.makeText(this@HighScoresActivity, "Could not display leaderboard.", Toast.LENGTH_SHORT).show()
+                    }
+                })
+        } catch (e: Exception) {
+            Log.e("HighScoresActivity", "Error showing leaderboard", e)
+            Toast.makeText(this, "Could not open leaderboard", Toast.LENGTH_SHORT).show()
+        }
+    }
+
     override fun onResume() {
         super.onResume()
         try {
@@ -143,6 +182,11 @@ class HighScoresActivity : AppCompatActivity() {
                     finish()
                     return true
                 }
+                KeyEvent.KEYCODE_BUTTON_Y -> {
+                    // Y button shows global leaderboard
+                    showGlobalLeaderboard()
+                    return true
+                }
             }
         }
         

app/src/main/java/com/pixelmintdrop/MainActivity.kt

@@ -55,6 +55,14 @@ import androidx.core.view.updatePadding
 import kotlin.math.max
 import kotlin.math.min
 import kotlin.random.Random
+// Google Play Games Services imports
+import com.google.android.gms.games.PlayGames
+import com.google.android.gms.games.PlayGamesSdk
+import com.google.android.gms.games.GamesSignInClient
+import com.google.android.gms.auth.api.signin.GoogleSignIn // Added for silent sign-in
+import com.google.android.gms.auth.api.signin.GoogleSignInClient // Added for silent sign-in
+import com.google.android.gms.auth.api.signin.GoogleSignInOptions // Added for silent sign-in
+import com.pixelmintdrop.model.GooglePlayGamesManager // Added import for listener
 
 class MainActivity : AppCompatActivity(), 
     GamepadController.GamepadConnectionListener,
@@ -63,11 +71,16 @@ class MainActivity : AppCompatActivity(),
     
     companion object {
         private const val TAG = "MainActivity"
+        private const val RC_LEADERBOARD_UI = 9004 // Request code for leaderboard UI
     }
     
     // ViewModel
     private val viewModel: MainActivityViewModel by viewModels() // Added ViewModel
     
+    // Google Play Games Services
+    private lateinit var gamesSignInClient: GamesSignInClient
+    private lateinit var googleSignInClient: GoogleSignInClient // Added for silent sign-in
+    
     // UI components
     private lateinit var binding: ActivityMainBinding
     private lateinit var gameView: GameView
@@ -157,6 +170,16 @@ class MainActivity : AppCompatActivity(),
         binding = ActivityMainBinding.inflate(layoutInflater)
         setContentView(binding.root)
         
+        // Initialize Google Play Games Services
+        PlayGamesSdk.initialize(this)
+        gamesSignInClient = PlayGames.getGamesSignInClient(this)
+        // Initialize GoogleSignInClient for silent sign-in
+        val signInOptions = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_GAMES_SIGN_IN).build()
+        googleSignInClient = GoogleSignIn.getClient(this, signInOptions)
+        
+        // Request sign-in silently
+        signInToPlayGames()
+        
         // Store initial padding values before applying insets
         val initialPausePadding = Rect(binding.pauseContainer.paddingLeft, binding.pauseContainer.paddingTop,
                                         binding.pauseContainer.paddingRight, binding.pauseContainer.paddingBottom)
@@ -450,6 +473,10 @@ class MainActivity : AppCompatActivity(),
             Log.d(TAG, "[GameOverDebug]   Triples: $lastSessionTriples (from manager: ${statsManager.getSessionTriples()})")
             Log.d(TAG, "[GameOverDebug]   Quads: $lastSessionQuads (from manager: ${statsManager.getSessionQuads()})")
 
+            // *** Submit score to Google Play Games ***
+            Log.d(TAG, "Attempting to submit end-game score to Play Games: $lastSessionScore")
+            highScoreManager.getGooglePlayGamesManager().submitScore(lastSessionScore.toLong(), this@MainActivity)
+
             // End the session (updates lifetime stats)
             statsManager.endSession()
 
@@ -529,9 +556,16 @@ class MainActivity : AppCompatActivity(),
             startGame()
         }
 
+        // High Scores button
         binding.highScoresButton.setOnClickListener {
-            gameHaptics.performHapticFeedback(it, HapticFeedbackConstants.VIRTUAL_KEY)
+            binding.pauseContainer.visibility = View.GONE
-            showHighScores()
+            val intent = Intent(this, HighScoresActivity::class.java)
+            startActivity(intent)
+        }
+
+        // Leaderboard button
+        binding.leaderboardButton?.setOnClickListener {
+            showLeaderboard()
         }
 
         binding.pauseLevelUpButton.setOnClickListener {
@@ -815,6 +849,7 @@ class MainActivity : AppCompatActivity(),
         binding.pauseRestartButton.setTextColor(themeColor)
         binding.resumeButton.setTextColor(themeColor)
         binding.highScoresButton.setTextColor(themeColor)
+        binding.leaderboardButton?.setTextColor(themeColor)
         binding.statsButton.setTextColor(themeColor)
         binding.pauseLevelUpButton?.setTextColor(themeColor) // Safe call
         binding.pauseLevelDownButton?.setTextColor(themeColor) // Safe call
@@ -1046,6 +1081,10 @@ class MainActivity : AppCompatActivity(),
             Log.d(TAG, "[GameOverDebug]   Triples: $lastSessionTriples (from manager: ${statsManager.getSessionTriples()})")
             Log.d(TAG, "[GameOverDebug]   Quads: $lastSessionQuads (from manager: ${statsManager.getSessionQuads()})")
 
+            // *** Submit score to Google Play Games ***
+            Log.d(TAG, "Attempting to submit end-game score to Play Games: $lastSessionScore")
+            highScoreManager.getGooglePlayGamesManager().submitScore(lastSessionScore.toLong(), this@MainActivity)
+
             // End the session (updates lifetime stats)
             statsManager.endSession()
 
@@ -1640,6 +1679,7 @@ class MainActivity : AppCompatActivity(),
 
         // Group 2: Stats and Scoring
         orderedViews.add(binding.highScoresButton)
+        orderedViews.add(binding.leaderboardButton)
         orderedViews.add(binding.statsButton)
         
         // Group 3: Level selection (use safe calls)
@@ -2206,4 +2246,82 @@ class MainActivity : AppCompatActivity(),
             Log.d("RandomMode", "Cannot apply random theme/skin - no unlocked options available")
         }
     }
+    
+    /**
+     * Handles sign-in to Google Play Games Services
+     */
+    private fun signInToPlayGames() {
+        Log.d(TAG, "Attempting to sign into Google Play Games")
+        gamesSignInClient.isAuthenticated.addOnCompleteListener { task ->
+            val isAuthenticated = task.isSuccessful && task.result.isAuthenticated
+            
+            if (!isAuthenticated) {
+                // Silent sign-in failed, but don't prompt right away
+                Log.d(TAG, "Not authenticated with Play Games, will prompt for sign-in when needed")
+                
+                // Optional: Add a sign-in button to your menu or UI for manual sign-in
+                // We'll attempt sign-in when accessing leaderboards or submitting scores
+            } else {
+                Log.d(TAG, "Already authenticated with Play Games")
+                
+                // If we were already authenticated, make sure scores are synced
+                val lastHighScore = highScoreManager.getHighScores().maxByOrNull { it.score }
+                lastHighScore?.let {
+                    // Submit the high score if we're already authenticated
+                    Log.d(TAG, "User is signed in, submitting last high score: ${it.score}")
+                    highScoreManager.getGooglePlayGamesManager().submitScore(it.score.toLong(), this)
+                }
+            }
+        }
+    }
+    
+    // Method to show Google Play Games leaderboard
+    private fun showLeaderboard() {
+        // New logic: Try silent sign-in first, then interactive if needed.
+        Log.d(TAG, "Attempting silent sign-in before showing leaderboard...")
+        // Use googleSignInClient for silentSignIn
+        googleSignInClient.silentSignIn().addOnCompleteListener { silentSignInTask ->
+            if (silentSignInTask.isSuccessful) {
+                // Silent sign-in successful OR user already signed in.
+                Log.d(TAG, "Silent sign-in successful/already signed in. Getting leaderboard intent.")
+                getAndShowLeaderboardIntent()
+            } else {
+                // Silent sign-in failed. Need explicit sign-in.
+                Log.w(TAG, "Silent sign-in failed. Attempting interactive sign-in.", silentSignInTask.exception)
+                // Use gamesSignInClient for interactive signIn
+                gamesSignInClient.signIn().addOnCompleteListener { interactiveSignInTask ->
+                    if (interactiveSignInTask.isSuccessful) {
+                        // Interactive sign-in successful
+                        Log.d(TAG, "Interactive sign-in successful. Getting leaderboard intent.")
+                        getAndShowLeaderboardIntent()
+                    } else {
+                        // Interactive sign-in failed
+                        Log.e(TAG, "Interactive sign-in failed.", interactiveSignInTask.exception)
+                        Toast.makeText(this, "Sign-in failed. Please try again.", Toast.LENGTH_SHORT).show()
+                    }
+                }
+            }
+        }
+    }
+    
+    // Helper function to get the intent from GooglePlayGamesManager and show it
+    private fun getAndShowLeaderboardIntent() {
+        highScoreManager.getGooglePlayGamesManager().showLeaderboard(this, 
+            object : GooglePlayGamesManager.LeaderboardIntentListener {
+                override fun onLeaderboardIntentSuccess(intent: Intent) {
+                    Log.d(TAG, "Received leaderboard intent, starting activity for result.")
+                    try {
+                        startActivityForResult(intent, RC_LEADERBOARD_UI)
+                    } catch (e: Exception) {
+                        Log.e(TAG, "Failed to start leaderboard activity for result", e)
+                        Toast.makeText(this@MainActivity, "Could not display leaderboard.", Toast.LENGTH_SHORT).show()
+                    }
+                }
+
+                override fun onLeaderboardIntentFailure(exception: Exception) {
+                    Log.e(TAG, "Failed to get leaderboard intent.", exception)
+                    Toast.makeText(this@MainActivity, "Could not display leaderboard.", Toast.LENGTH_SHORT).show()
+                }
+            })
+    }
 } 

app/src/main/java/com/pixelmintdrop/model/GooglePlayGamesManager.kt

@@ -0,0 +1,169 @@
+package com.pixelmintdrop.model
+
+import android.app.Activity
+import android.content.Context
+import android.content.Intent
+import android.util.Log
+import androidx.activity.result.ActivityResultLauncher
+import com.google.android.gms.auth.api.signin.GoogleSignIn
+import com.google.android.gms.auth.api.signin.GoogleSignInAccount
+import com.google.android.gms.auth.api.signin.GoogleSignInClient
+import com.google.android.gms.auth.api.signin.GoogleSignInOptions
+import com.google.android.gms.games.PlayGames
+import com.google.android.gms.games.PlayGamesSdk
+import com.google.android.gms.tasks.Task
+
+class GooglePlayGamesManager(private val context: Context) {
+    private val TAG = "GooglePlayGamesManager"
+    
+    // Define a listener interface for the leaderboard intent
+    interface LeaderboardIntentListener {
+        fun onLeaderboardIntentSuccess(intent: Intent)
+        fun onLeaderboardIntentFailure(exception: Exception)
+    }
+    
+    // Leaderboard ID
+    companion object {
+        const val LEADERBOARD_ID = "CgkImJW2mKsSEAIQAQ"
+    }
+    
+    // Initialize the Play Games SDK
+    init {
+        try {
+            PlayGamesSdk.initialize(context)
+            Log.d(TAG, "PlayGamesSdk initialized")
+        } catch (e: Exception) {
+            Log.e(TAG, "Error initializing PlayGamesSdk", e)
+        }
+    }
+    
+    // Check if user is already signed in
+    fun isSignedIn(): Boolean {
+        val account = GoogleSignIn.getLastSignedInAccount(context)
+        return account != null && !account.isExpired
+    }
+    
+    // Get the sign-in client
+    fun getSignInClient(): GoogleSignInClient {
+        val signInOptions = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_GAMES_SIGN_IN).build()
+        return GoogleSignIn.getClient(context, signInOptions)
+    }
+    
+    // Handle sign-in result
+    fun handleSignInResult(task: Task<GoogleSignInAccount>): Boolean {
+        return if (task.isSuccessful) {
+            Log.d(TAG, "Sign-in successful")
+            true
+        } else {
+            Log.e(TAG, "Sign-in failed", task.exception)
+            false
+        }
+    }
+    
+    // Submit score to leaderboard (requires an activity for potential sign-in)
+    fun submitScore(score: Long, activity: Activity? = null) {
+        if (activity == null) {
+            Log.w(TAG, "Activity context is required for score submission.")
+            return
+        }
+
+        Log.d(TAG, "Attempting to submit score: $score")
+        
+        // Always force a sign-in to ensure we have a valid account
+        val signInClient = PlayGames.getGamesSignInClient(activity)
+        signInClient.signIn().addOnCompleteListener { signInTask ->
+            if (signInTask.isSuccessful) {
+                Log.d(TAG, "Sign-in successful, retrieving account for score submission")
+                
+                // After sign-in, get the account and submit score
+                try {
+                    // Use PlayGames API directly to get client and submit score
+                    val leaderboardsClient = PlayGames.getLeaderboardsClient(activity)
+                    leaderboardsClient.submitScore(LEADERBOARD_ID, score)
+                    Log.d(TAG, "Successfully submitted score $score to leaderboard $LEADERBOARD_ID")
+                    
+                    // Show confirmation to user
+                    android.widget.Toast.makeText(
+                        activity,
+                        "Score submitted to leaderboard",
+                        android.widget.Toast.LENGTH_SHORT
+                    ).show()
+                } catch (e: Exception) {
+                    Log.e(TAG, "Error submitting score after sign-in", e)
+                    android.widget.Toast.makeText(
+                        activity,
+                        "Failed to submit score to leaderboard",
+                        android.widget.Toast.LENGTH_SHORT
+                    ).show()
+                }
+            } else {
+                Log.e(TAG, "Sign-in failed, unable to submit score", signInTask.exception)
+                android.widget.Toast.makeText(
+                    activity,
+                    "Sign-in required to submit score to leaderboard",
+                    android.widget.Toast.LENGTH_SHORT
+                ).show()
+            }
+        }
+    }
+    
+    // Show the leaderboard - Now uses a listener to return the Intent
+    fun showLeaderboard(activity: Activity, listener: LeaderboardIntentListener) {
+        Log.d(TAG, "showLeaderboard called in GooglePlayGamesManager")
+        
+        // First check if already authenticated
+        PlayGames.getGamesSignInClient(activity).isAuthenticated.addOnCompleteListener { authTask ->
+            val isAuthenticated = authTask.isSuccessful && authTask.result.isAuthenticated
+            
+            if (isAuthenticated) {
+                // Already authenticated, get leaderboard
+                getLeaderboardIntent(activity, listener)
+            } else {
+                // Need to authenticate first
+                Log.d(TAG, "User not authenticated for leaderboard, attempting sign-in")
+                PlayGames.getGamesSignInClient(activity).signIn().addOnCompleteListener { signInTask ->
+                    if (signInTask.isSuccessful) {
+                        // Successfully signed in, now get leaderboard
+                        Log.d(TAG, "Sign-in successful, getting leaderboard")
+                        getLeaderboardIntent(activity, listener)
+                    } else {
+                        // Failed to sign in
+                        Log.e(TAG, "Failed to sign in for leaderboard access", signInTask.exception)
+                        listener.onLeaderboardIntentFailure(
+                            Exception("Sign-in required to view leaderboard", signInTask.exception)
+                        )
+                        
+                        // Inform user
+                        android.widget.Toast.makeText(
+                            activity,
+                            "Sign-in required to view leaderboard",
+                            android.widget.Toast.LENGTH_SHORT
+                        ).show()
+                    }
+                }
+            }
+        }
+    }
+    
+    // Private helper to get leaderboard intent
+    private fun getLeaderboardIntent(activity: Activity, listener: LeaderboardIntentListener) {
+        Log.d(TAG, "Attempting to get LeaderboardsClient")
+        try {
+            val leaderboardsClient = PlayGames.getLeaderboardsClient(activity)
+            Log.d(TAG, "LeaderboardsClient obtained, attempting to get leaderboard intent for ID: $LEADERBOARD_ID")
+            leaderboardsClient
+                .getLeaderboardIntent(LEADERBOARD_ID)
+                .addOnSuccessListener { intent ->
+                    Log.d(TAG, "Successfully obtained leaderboard intent. Calling listener.")
+                    listener.onLeaderboardIntentSuccess(intent)
+                }
+                .addOnFailureListener { e ->
+                    Log.e(TAG, "Error getting leaderboard intent", e)
+                    listener.onLeaderboardIntentFailure(e)
+                }
+        } catch (e: Exception) {
+            Log.e(TAG, "Error obtaining LeaderboardsClient or getting leaderboard intent", e)
+            listener.onLeaderboardIntentFailure(e)
+        }
+    }
+} 

app/src/main/java/com/pixelmintdrop/model/HighScoreManager.kt

@@ -10,6 +10,7 @@ class HighScoreManager(private val context: Context) {
     private val prefs: SharedPreferences = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
     private val gson = Gson()
     private val type: Type = object : TypeToken<List<HighScore>>() {}.type
+    private val googlePlayGamesManager = GooglePlayGamesManager(context)
 
     companion object {
         private const val PREFS_NAME = "pixelmintdrop_highscores"
@@ -27,6 +28,7 @@ class HighScoreManager(private val context: Context) {
     }
 
     fun addHighScore(highScore: HighScore) {
+        // Save to local high scores
         val currentScores = getHighScores().toMutableList()
         currentScores.add(highScore)
         
@@ -37,6 +39,9 @@ class HighScoreManager(private val context: Context) {
         // Save to SharedPreferences
         val json = gson.toJson(topScores)
         prefs.edit().putString(KEY_HIGHSCORES, json).apply()
+        
+        // Submit to Google Play Games leaderboard if signed in
+        submitScoreToGooglePlay(highScore.score)
     }
 
     fun isHighScore(score: Int): Boolean {
@@ -44,4 +49,26 @@ class HighScoreManager(private val context: Context) {
         return currentScores.size < MAX_HIGHSCORES || 
                score > (currentScores.lastOrNull()?.score ?: 0)
     }
+    
+    // Submit score to Google Play Games leaderboard
+    private fun submitScoreToGooglePlay(score: Int) {
+        // We don't have an activity here, so we can't submit the score directly
+        // The score will be submitted later when an activity is available
+        try {
+            googlePlayGamesManager.submitScore(score.toLong(), null)
+        } catch (e: Exception) {
+            // Log error but don't crash
+            android.util.Log.e("HighScoreManager", "Error submitting score to leaderboard", e)
+        }
+    }
+    
+    // Method to check if user is signed in to Google Play Games
+    fun isGooglePlaySignedIn(): Boolean {
+        return googlePlayGamesManager.isSignedIn()
+    }
+    
+    // Get Google Play Games manager
+    fun getGooglePlayGamesManager(): GooglePlayGamesManager {
+        return googlePlayGamesManager
+    }
 } 

app/src/main/res/layout-land/activity_main.xml

@@ -438,6 +438,20 @@
                     android:singleLine="true"
                     android:focusable="true"
                     android:focusableInTouchMode="true" />
+
+                <!-- Leaderboard Button -->
+                <Button
+                    android:id="@+id/leaderboardButton"
+                    android:layout_width="200dp"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="8dp"
+                    android:background="@color/transparent"
+                    android:text="Global Leaderboard"
+                    android:textColor="@color/white"
+                    android:textSize="20sp"
+                    android:textStyle="bold"
+                    android:fontFamily="sans-serif"
+                    android:textAllCaps="false" />
             </LinearLayout>
         </ScrollView>
     </LinearLayout>

app/src/main/res/layout/activity_main.xml

@@ -407,6 +407,19 @@
                     android:fontFamily="sans-serif"
                     android:textAllCaps="false" />
                     
+                <Button
+                    android:id="@+id/leaderboardButton"
+                    android:layout_width="200dp"
+                    android:layout_height="wrap_content"
+                    android:layout_marginTop="16dp"
+                    android:background="@color/transparent"
+                    android:text="Global Leaderboard"
+                    android:textColor="@color/white"
+                    android:textSize="24sp"
+                    android:textStyle="bold"
+                    android:fontFamily="sans-serif"
+                    android:textAllCaps="false" />
+                    
                 <Button
                     android:id="@+id/statsButton"
                     android:layout_width="200dp"

app/src/main/res/layout/high_scores.xml

@@ -25,15 +25,37 @@
         android:layout_weight="1"
         android:layout_marginBottom="16dp"/>
 
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        android:gravity="center">
+
         <Button
             android:id="@+id/backButton"
-        android:layout_width="200dp"
+            android:layout_width="0dp"
             android:layout_height="wrap_content"
+            android:layout_weight="1"
             android:layout_gravity="center"
+            android:layout_marginEnd="8dp"
             android:background="@color/transparent"
             android:text="@string/back"
             android:textColor="@color/white"
             android:textSize="18sp"
             android:fontFamily="monospace"/>
 
+        <Button
+            android:id="@+id/leaderboardButton"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:layout_gravity="center"
+            android:layout_marginStart="8dp"
+            android:background="@color/transparent"
+            android:text="Global Leaderboard"
+            android:textColor="@color/white"
+            android:textSize="18sp"
+            android:fontFamily="monospace"/>
+    </LinearLayout>
+
 </LinearLayout> 

app/src/main/res/values/strings.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <string name="app_name">Pixel Mint Drop</string>
+    <string name="app_id">630069234328</string>
     <string name="game_over">game over</string>
     <string name="score">score</string>
     <string name="level">level</string>