diff --git a/locallib.php b/locallib.php
index 2d74f2e..9d0263d 100755
--- a/locallib.php
+++ b/locallib.php
@@ -567,8 +567,8 @@ function game_questions_shortanswer_question( $game)
     $select = 'q.category='.$game->questioncategoryid;        
     if( $game->subcategories){
         $cats = question_categorylist( $game->questioncategoryid);
-        if( strpos( $cats, ',') > 0){
-            $select = 'q.category in ('.$cats.')';
+        if( count( $cats)){
+            $select = 'q.category in ('.implode(',', $cats).')';
         }
     }    		
     		
diff --git a/millionaire/play.php b/millionaire/play.php
index ed8cccc..dfc81be 100755
--- a/millionaire/play.php
+++ b/millionaire/play.php
@@ -311,9 +311,9 @@ function game_millionaire_SelectQuestion( &$aAnswer, $game, $attempt, &$milliona
 		$select = 'category='.$game->questioncategoryid;
         if( $game->subcategories){
             $cats = question_categorylist( $game->questioncategoryid);
-            if( strpos( $cats, ',') > 0){
-                $select = 'category in ('.$cats.')';
-            }
+            if( count( $cats)){
+                $select = 'q.category in ('.implode(',', $cats).')';
+            }            
         }  						
 		$select .= " AND qtype='multichoice'";
 		
diff --git a/version.php b/version.php
index 6d65596..db4d534 100755
--- a/version.php
+++ b/version.php
@@ -11,7 +11,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 $module->component = 'mod_game';  // Full name of the plugin (used for diagnostics)
-$module->version   = 2013012704;  // The current module version (Date: YYYYMMDDXX)
+$module->version   = 2013012801;  // The current module version (Date: YYYYMMDDXX)
 $module->requires  = 2010112400;  // Requires Moodle 2.0
 $module->cron      = 0;           // Period for cron to check this module (secs)
-$module->release   = 'v.2.13.27 (2013012704)';
+$module->release   = 'v.2.13.28 (2013012801)';