diff --git a/src/Controller/GameController.php b/src/Controller/GameController.php
index 4e74cd0..43b04e0 100644
--- a/src/Controller/GameController.php
+++ b/src/Controller/GameController.php
@@ -1,28 +1,47 @@
 <?php namespace MapGuesser\Controller;
 
 use MapGuesser\Util\Geo\Bounds;
-use MapGuesser\Util\Geo\Position;
 use MapGuesser\View\HtmlView;
 use MapGuesser\View\ViewBase;
 use mysqli;
 
 class GameController implements ControllerInterface
 {
+    private mysqli $mysql;
+
+    // demo map
+    private int $mapId = 1;
+
+    public function __construct()
+    {
+        $this->mysql = new mysqli($_ENV['DB_HOST'], $_ENV['DB_USER'], $_ENV['DB_PASSWORD'], $_ENV['DB_NAME']);
+    }
+
     public function run(): ViewBase
     {
-        $mysql = new mysqli($_ENV['DB_HOST'], $_ENV['DB_USER'], $_ENV['DB_PASSWORD'], $_ENV['DB_NAME']);
+        $bounds = $this->getMapBounds();
 
-        // demo map
-        $mapId = 1;
+        if (!isset($_SESSION['state']) || $_SESSION['state']['mapId'] !== $this->mapId) {
+            $_SESSION['state'] = [
+                'mapId' => $this->mapId,
+                'area' => $bounds->calculateApproximateArea(),
+                'rounds' => []
+            ];
+        }
 
-        $stmt = $mysql->prepare('SELECT bound_south_lat, bound_west_lng, bound_north_lat, bound_east_lng FROM maps WHERE id=?');
-        $stmt->bind_param("i", $mapId);
+        $data = ['bounds' => $bounds->toArray()];
+        return new HtmlView('game', $data);
+    }
+
+    private function getMapBounds(): Bounds
+    {
+        $stmt = $this->mysql->prepare('SELECT bound_south_lat, bound_west_lng, bound_north_lat, bound_east_lng FROM maps WHERE id=?');
+        $stmt->bind_param("i", $this->mapId);
         $stmt->execute();
         $map = $stmt->get_result()->fetch_assoc();
 
         $bounds = Bounds::createDirectly($map['bound_south_lat'], $map['bound_west_lng'], $map['bound_north_lat'], $map['bound_east_lng']);
 
-        $data = compact('bounds');
-        return new HtmlView('game', $data);
+        return $bounds;
     }
 }
diff --git a/views/game.php b/views/game.php
index 07a03e0..fee7284 100644
--- a/views/game.php
+++ b/views/game.php
@@ -48,8 +48,7 @@
         </div>
     </div>
     <script>
-        var mapArea = <?= $bounds->calculateApproximateArea() ?>;
-        var guessMapBounds = <?= $bounds->toJson() ?>;
+        var mapBounds = <?= json_encode($bounds) ?>;
     </script>
     <script src="https://maps.googleapis.com/maps/api/js?key=<?= $_ENV['GOOGLE_MAPS_JS_API_KEY'] ?>"></script>
     <script src="static/js/mapguesser.js"></script>