diff --git a/game/ios/Runner/AppDelegate.swift b/game/ios/Runner/AppDelegate.swift
index 1d7f1447..1807eea4 100644
--- a/game/ios/Runner/AppDelegate.swift
+++ b/game/ios/Runner/AppDelegate.swift
@@ -4,7 +4,7 @@ import Firebase
 import GoogleMaps
 import flutter_config
 
-@UIApplicationMain
+@main
 @objc class AppDelegate: FlutterAppDelegate {
   override func application(
     _ application: UIApplication,
diff --git a/game/lib/api/game_api.dart b/game/lib/api/game_api.dart
index 89171828..1c0c846c 100644
--- a/game/lib/api/game_api.dart
+++ b/game/lib/api/game_api.dart
@@ -211,13 +211,14 @@ class ApiClient extends ChangeNotifier {
       _createSocket(false);
       return loginResponse;
     } else {
-      print(loginResponse.body);
-    }
-    authenticated = false;
-    notifyListeners();
+      print("LoginResponse:" + loginResponse.body);
 
-    print("Failed to connect to server!");
-    return null;
+      authenticated = false;
+      notifyListeners();
+
+      print("Failed to connect to server!");
+      return null;
+    }
     /*
     }
     print("Failed to get location data!");
@@ -243,4 +244,24 @@ class ApiClient extends ChangeNotifier {
     authenticated = false;
     notifyListeners();
   }
+
+  Future<bool> checkUserExists(String idToken) async {
+    try {
+      final uri = _googleLoginUrl.replace(
+        path: '${_googleLoginUrl.path}/check-user',
+        queryParameters: {'idToken': idToken},
+      );
+      final response = await http.get(uri);
+
+      if (response.statusCode == 200) {
+        final responseData = jsonDecode(response.body);
+        return responseData['exists'];
+      }
+      print('Failed to check user. Status code: ${response.statusCode}');
+      return false;
+    } catch (e) {
+      print('Error occurred while checking user: $e');
+      return false;
+    }
+  }
 }
diff --git a/game/lib/api/geopoint.dart b/game/lib/api/geopoint.dart
index c5eafb62..43f1dadc 100644
--- a/game/lib/api/geopoint.dart
+++ b/game/lib/api/geopoint.dart
@@ -48,14 +48,16 @@ class GeoPoint {
         return Future.error(
             'Location permissions are permanently denied, we cannot request permissions.');
       }
+      print("Getting location");
       final pos = await Geolocator.getCurrentPosition(
           // Ideally we would use best accuracy, but it doesn't work for some reason
           // desiredAccuracy: LocationAccuracy.best
           desiredAccuracy: LocationAccuracy.medium);
+      print("Got location: ${pos.latitude}, ${pos.longitude}");
       return GeoPoint(pos.latitude, pos.longitude, pos.heading);
     } catch (e) {
       print(e);
-      return Future.error(e.toString());
+      return Future.error("Error:" + e.toString());
     }
   }
 
diff --git a/game/lib/interests/interests_page.dart b/game/lib/interests/interests_page.dart
index f555c205..026f8323 100644
--- a/game/lib/interests/interests_page.dart
+++ b/game/lib/interests/interests_page.dart
@@ -5,6 +5,8 @@ import 'package:google_sign_in/google_sign_in.dart';
 import 'package:game/utils/utility_functions.dart';
 import 'package:flutter_svg/flutter_svg.dart';
 
+/// This page allows the user to select their interests. Connection to backend
+/// (creating the user) happens here.
 class InterestsPageWidget extends StatefulWidget {
   InterestsPageWidget(
       {Key? key,
diff --git a/game/lib/register_page/register_page.dart b/game/lib/register_page/register_page.dart
index 94ce5fa6..308bd209 100644
--- a/game/lib/register_page/register_page.dart
+++ b/game/lib/register_page/register_page.dart
@@ -4,6 +4,10 @@ import 'package:game/details_page/details_page.dart';
 import 'package:google_sign_in/google_sign_in.dart';
 import 'package:flutter_svg/flutter_svg.dart';
 
+/// If the google-login user is not registered, this page will be displayed.
+/// The user will be asked to select their enrollment type. The user is created
+/// only when they fill all required information (at registerpage -> details_page
+/// -> interests_page).
 class RegisterPageWidget extends StatefulWidget {
   final GoogleSignInAccount? user;
   final String? idToken;
diff --git a/game/lib/splash_page/splash_page.dart b/game/lib/splash_page/splash_page.dart
index 10758960..eaca812b 100644
--- a/game/lib/splash_page/splash_page.dart
+++ b/game/lib/splash_page/splash_page.dart
@@ -79,11 +79,27 @@ class SplashPageWidget extends StatelessWidget {
                           return;
                         }
 
-                        final gRelogResult =
-                            await apiClient.connectGoogleNoRegister(account);
+                        final auth = await account.authentication;
+                        final idToken = auth.idToken;
 
-                        if (gRelogResult != null) {
-                          return;
+                        bool userExists =
+                            await apiClient.checkUserExists(idToken ?? "");
+                        if (userExists) {
+                          // User exists, proceed with the login process
+                          final gRelogResult =
+                              await client.connectGoogleNoRegister(account);
+
+                          if (gRelogResult != null) {
+                            return;
+                          }
+                        } else {
+                          // User does not exist, navigate to registration page
+                          Navigator.of(context).push(
+                            MaterialPageRoute(
+                              builder: (context) => RegisterPageWidget(
+                                  user: account, idToken: idToken),
+                            ),
+                          );
                         }
 
                         Navigator.of(context).push(
diff --git a/game/pubspec.lock b/game/pubspec.lock
index be39b8c3..7995c094 100644
--- a/game/pubspec.lock
+++ b/game/pubspec.lock
@@ -553,10 +553,10 @@ packages:
     dependency: "direct main"
     description:
       name: intl
-      sha256: "3bc132a9dbce73a7e4a21a17d06e1878839ffbf975568bc875c60537824b0c4d"
+      sha256: d6f56758b7d3014a48af9701c085700aac781a92a87a62b1333b46d8879661cf
       url: "https://pub.dev"
     source: hosted
-    version: "0.18.1"
+    version: "0.19.0"
   js:
     dependency: transitive
     description:
@@ -593,26 +593,26 @@ packages:
     dependency: transitive
     description:
       name: leak_tracker
-      sha256: "78eb209deea09858f5269f5a5b02be4049535f568c07b275096836f01ea323fa"
+      sha256: "3f87a60e8c63aecc975dda1ceedbc8f24de75f09e4856ea27daf8958f2f0ce05"
       url: "https://pub.dev"
     source: hosted
-    version: "10.0.0"
+    version: "10.0.5"
   leak_tracker_flutter_testing:
     dependency: transitive
     description:
       name: leak_tracker_flutter_testing
-      sha256: b46c5e37c19120a8a01918cfaf293547f47269f7cb4b0058f21531c2465d6ef0
+      sha256: "932549fb305594d82d7183ecd9fa93463e9914e1b67cacc34bc40906594a1806"
       url: "https://pub.dev"
     source: hosted
-    version: "2.0.1"
+    version: "3.0.5"
   leak_tracker_testing:
     dependency: transitive
     description:
       name: leak_tracker_testing
-      sha256: a597f72a664dbd293f3bfc51f9ba69816f84dcd403cdac7066cb3f6003f3ab47
+      sha256: "6ba465d5d76e67ddf503e1161d1f4a6bc42306f9d66ca1e8f079a47290fb06d3"
       url: "https://pub.dev"
     source: hosted
-    version: "2.0.1"
+    version: "3.0.1"
   linkify:
     dependency: transitive
     description:
@@ -681,18 +681,18 @@ packages:
     dependency: transitive
     description:
       name: material_color_utilities
-      sha256: "0e0a020085b65b6083975e499759762399b4475f766c21668c4ecca34ea74e5a"
+      sha256: f7142bb1154231d7ea5f96bc7bde4bda2a0945d2806bb11670e30b850d56bdec
       url: "https://pub.dev"
     source: hosted
-    version: "0.8.0"
+    version: "0.11.1"
   meta:
     dependency: transitive
     description:
       name: meta
-      sha256: d584fa6707a52763a52446f02cc621b077888fb63b93bbcb1143a7be5a0c0c04
+      sha256: bdb68674043280c3428e9ec998512fb681678676b3c54e773629ffe74419f8c7
       url: "https://pub.dev"
     source: hosted
-    version: "1.11.0"
+    version: "1.15.0"
   mgrs_dart:
     dependency: transitive
     description:
@@ -1078,10 +1078,10 @@ packages:
     dependency: transitive
     description:
       name: test_api
-      sha256: "5c2f730018264d276c20e4f1503fd1308dfbbae39ec8ee63c5236311ac06954b"
+      sha256: "5b8a98dafc4d5c4c9c72d8b31ab2b23fc13422348d2997120294d3bac86b4ddb"
       url: "https://pub.dev"
     source: hosted
-    version: "0.6.1"
+    version: "0.7.2"
   tuple:
     dependency: "direct main"
     description:
@@ -1214,18 +1214,18 @@ packages:
     dependency: "direct main"
     description:
       name: velocity_x
-      sha256: "38585b8ed87c17ccb42a5c13d55bdafdc65e7cd3f41dceb61c38714c758fa228"
+      sha256: "99b910c80cc2010b184ef921f0af6894a8d632e13169cf77e6f6cb5a7f310698"
       url: "https://pub.dev"
     source: hosted
-    version: "4.1.2"
+    version: "4.2.1"
   vm_service:
     dependency: transitive
     description:
       name: vm_service
-      sha256: b3d56ff4341b8f182b96aceb2fa20e3dcb336b9f867bc0eafc0de10f1048e957
+      sha256: "5c5f338a667b4c644744b661f309fb8080bb94b18a7e91ef1dbd343bed00ed6d"
       url: "https://pub.dev"
     source: hosted
-    version: "13.0.0"
+    version: "14.2.5"
   vxstate:
     dependency: transitive
     description:
@@ -1243,13 +1243,13 @@ packages:
     source: hosted
     version: "0.5.1"
   win32:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: win32
-      sha256: "0eaf06e3446824099858367950a813472af675116bf63f008a4c2a75ae13e9cb"
+      sha256: "84ba388638ed7a8cb3445a320c8273136ab2631cd5f2c57888335504ddab1bc2"
       url: "https://pub.dev"
     source: hosted
-    version: "5.5.0"
+    version: "5.8.0"
   win32_registry:
     dependency: transitive
     description:
@@ -1291,5 +1291,5 @@ packages:
     source: hosted
     version: "3.1.2"
 sdks:
-  dart: ">=3.3.0 <4.0.0"
+  dart: ">=3.5.0 <4.0.0"
   flutter: ">=3.19.0"
diff --git a/game/pubspec.yaml b/game/pubspec.yaml
index 8ceac575..b215f36c 100644
--- a/game/pubspec.yaml
+++ b/game/pubspec.yaml
@@ -59,6 +59,7 @@ dependencies:
   carousel_slider: ^5.0.0
   tuple: ^2.0.2
   sticky_headers: ^0.3.0+2
+  win32: ^5.6.1
 
 dev_dependencies:
   flutter_launcher_icons:
diff --git a/server/src/auth/auth.service.ts b/server/src/auth/auth.service.ts
index a3088fe7..dc88dfef 100644
--- a/server/src/auth/auth.service.ts
+++ b/server/src/auth/auth.service.ts
@@ -14,6 +14,12 @@ interface IntermediatePayload {
   email: string;
 }
 
+/**
+ * The `AuthService` class provides authentication-related functionality for the application,
+ * including login, token management, and user verification.
+ *
+ * Now supports Google and Apple (OAuth), and device login. Only Cornell emails are allowed.
+ */
 @Injectable()
 export class AuthService {
   constructor(
@@ -37,6 +43,13 @@ export class AuthService {
     secret: process.env.JWT_ACCESS_SECRET,
   };
 
+  /**
+   * Verifies an Apple ID token and extracts the user's ID and email.
+   *
+   * @param idToken - The ID token from Apple Sign-In.
+   * @returns An object containing the user’s `id` and `email` if verification is successful;
+   *          otherwise, `null` if verification fails.
+   */
   async payloadFromApple(idToken: string): Promise<IntermediatePayload | null> {
     try {
       const payload = await appleSignin.verifyIdToken(
@@ -54,6 +67,14 @@ export class AuthService {
     }
   }
 
+  /**
+   * Verifies a Google ID token based on the audience (platform) and extracts the user's ID and email.
+   *
+   * @param idToken - The ID token received from Google.
+   * @param aud - The platform that issued the token: 'android', 'ios', or 'web'.
+   * @returns An object containing the user's `id` and `email` if verification is successful;
+   *          otherwise, `null` if verification fails.
+   */
   async payloadFromGoogle(
     idToken: string,
     aud: 'android' | 'ios' | 'web',
@@ -89,6 +110,14 @@ export class AuthService {
     }
   }
 
+  /**
+   * Authenticates a user based on the user credentials, issues access and refresh tokens.
+   *
+   * @param authType - The type of authentication used.
+   * @param req - The login DTO containing user credentials.
+   * @returns A tuple `[accessToken, refreshToken]` if login is successful;
+   *          otherwise, `null` if authentication fails.
+   */
   async login(
     authType: AuthType,
     req: LoginDto,
@@ -141,10 +170,15 @@ export class AuthService {
         idToken.id,
         req.enrollmentType,
       );
+
+      if (!user) {
+        console.log('Unable to register user');
+        return null;
+      }
     }
 
+    // if user is null here, then it means we're not registering this user now (req.noRegister === true)
     if (!user) {
-      console.log('Unable to register user');
       return null;
     }
 
diff --git a/server/src/auth/google/google.controller.ts b/server/src/auth/google/google.controller.ts
index aa9b2755..a6abd055 100644
--- a/server/src/auth/google/google.controller.ts
+++ b/server/src/auth/google/google.controller.ts
@@ -1,11 +1,15 @@
-import { Controller, Post, Body } from '@nestjs/common';
+import { Controller, Post, Body, Get, Query } from '@nestjs/common';
 import { AuthType } from '@prisma/client';
 import { AuthService } from '../auth.service';
 import { LoginDto } from '../login.dto';
+import { UserService } from '../../user/user.service';
 
 @Controller('google')
 export class GoogleController {
-  constructor(private readonly authService: AuthService) {}
+  constructor(
+    private readonly authService: AuthService,
+    private readonly userService: UserService,
+  ) {}
 
   // login
   @Post()
@@ -16,4 +20,26 @@ export class GoogleController {
 
     return tokens && { accessToken: tokens[0], refreshToken: tokens[1] };
   }
+
+  // check user existence
+  @Get('check-user')
+  async checkUser(
+    @Query('idToken') idToken: string,
+  ): Promise<{ exists: boolean; user?: any }> {
+    const idTokenPayload = await this.authService.payloadFromGoogle(
+      idToken,
+      'web',
+    );
+
+    if (!idTokenPayload) {
+      console.log('Invalid token or unable to decode token');
+      return { exists: false };
+    }
+
+    const user = await this.userService.byAuth(
+      AuthType.GOOGLE,
+      idTokenPayload.id,
+    );
+    return user ? { exists: true, user } : { exists: false };
+  }
 }
diff --git a/server/src/user/user.service.ts b/server/src/user/user.service.ts
index e8f3dbb5..ace3bf41 100644
--- a/server/src/user/user.service.ts
+++ b/server/src/user/user.service.ts
@@ -219,6 +219,13 @@ export class UserService {
     });
   }
 
+  async checkIfUserExists(
+    authType: AuthType,
+    id: string,
+  ): Promise<User | null> {
+    return this.byAuth(authType, id);
+  }
+
   async dtoForUserData(user: User, partial: boolean): Promise<UserDto> {
     const joinedUser = await this.prisma.user.findUniqueOrThrow({
       where: { id: user.id },