diff --git a/app/Game/GameBoardState.php b/app/Game/GameBoardState.php
index 427cc57..55d584d 100644
--- a/app/Game/GameBoardState.php
+++ b/app/Game/GameBoardState.php
@@ -59,6 +59,14 @@ class GameBoardState
         return $this;
     }
 
+    public function setAll(): self
+    {
+        for ($i = 0; $i < $this->width * $this->height; $i++) {
+            $this->set($i, true);
+        }
+        return $this;
+    }
+
     /**
      * Toggle pressed state of a cell.
      */