diff --git a/src/Game/Service/GameResponseService.php b/src/Game/Service/GameResponseService.php
index 337b772..5c80806 100644
--- a/src/Game/Service/GameResponseService.php
+++ b/src/Game/Service/GameResponseService.php
@@ -784,7 +784,9 @@ class GameResponseService
 
     private function generateSpecialCode(int $firstDigit, int $min, int $max): string
     {
-        $code = $this->generateRandomString($min, $max);
+        // No spaces: this code gets typed back in as a single /decode argument,
+        // which is split on spaces, so a space here would silently truncate it.
+        $code = str_replace(' ', '', $this->generateRandomString($min, $max));
 
         // Ensure the first numeric digit is the specified $firstDigit
         $found = false;