diff --git a/db/upgrade.php b/db/upgrade.php
index b046d7b..d565d81 100644
--- a/db/upgrade.php
+++ b/db/upgrade.php
@@ -1581,7 +1581,7 @@ function xmldb_game_upgrade($oldversion) {
         $dbman->change_field_type($table, $field);
     }
 
-    if ($oldversion < ($ver = 2017062701)) {
+    if ($oldversion < ($ver = 2017062801)) {
         $table = new xmldb_table('game_cross');
         $field = new xmldb_field('usedrows', XMLDB_TYPE_INTEGER, '3', XMLDB_UNSIGNED, null, null, '0', 'id');
         if (!$dbman->field_exists($table, $field)) {
@@ -1591,13 +1591,12 @@ function xmldb_game_upgrade($oldversion) {
         $field = new xmldb_field('rows', XMLDB_TYPE_INTEGER, '3', XMLDB_UNSIGNED, null, null, '0', 'id');
         if ($dbman->field_exists($table, $field)) {
             mpgame_db_copy_string_to_int( 'game_cross', 'rows', 'usedrows');
-            $dbman->drop_field($table, $field);
         } else {
             $dbman->add_field($table, $field);
         }
     }
 
-    if ($oldversion < ($ver = 2017062701)) {
+    if ($oldversion < ($ver = 2017062801)) {
         $table = new xmldb_table('game_cross');
         $field = new xmldb_field('usedcols', XMLDB_TYPE_INTEGER, '3', XMLDB_UNSIGNED, null, null, '0', 'id');
         if (!$dbman->field_exists($table, $field)) {
@@ -1607,13 +1606,12 @@ function xmldb_game_upgrade($oldversion) {
         $field = new xmldb_field('cols', XMLDB_TYPE_INTEGER, '3', XMLDB_UNSIGNED, null, null, '0', 'id');
         if ($dbman->field_exists($table, $field)) {
             mpgame_db_copy_string_to_int( 'game_cross', 'cols', 'usedcols');
-            $dbman->drop_field($table, $field);
         } else {
             $dbman->add_field($table, $field);
         }
     }
 
-    if ($oldversion < ($ver = 2017062701)) {
+    if ($oldversion < ($ver = 2017062801)) {
         $table = new xmldb_table('game_snakes_database');
         $field = new xmldb_field('usedrows', XMLDB_TYPE_INTEGER, '3', XMLDB_UNSIGNED, null, null, '0', 'id');
         if (!$dbman->field_exists($table, $field)) {
@@ -1623,13 +1621,12 @@ function xmldb_game_upgrade($oldversion) {
         $field = new xmldb_field('rows', XMLDB_TYPE_INTEGER, '3', XMLDB_UNSIGNED, null, null, '0', 'id');
         if ($dbman->field_exists($table, $field)) {
             mpgame_db_copy_string_to_int( 'game_snakes_database', 'rows', 'usedrows');
-            $dbman->drop_field($table, $field);
         } else {
             $dbman->add_field($table, $field);
         }
     }
 
-    if ($oldversion < ($ver = 2017062701)) {
+    if ($oldversion < ($ver = 2017062801)) {
         $table = new xmldb_table('game_snakes_database');
         $field = new xmldb_field('usedcols', XMLDB_TYPE_INTEGER, '3', XMLDB_UNSIGNED, null, null, '0', 'id');
         if (!$dbman->field_exists($table, $field)) {
@@ -1639,7 +1636,6 @@ function xmldb_game_upgrade($oldversion) {
         $field = new xmldb_field('cols', XMLDB_TYPE_INTEGER, '3', XMLDB_UNSIGNED, null, null, '0', 'id');
         if ($dbman->field_exists($table, $field)) {
             mpgame_db_copy_string_to_int( 'game_snakes_database', 'cols', 'usedcols');
-            $dbman->drop_field($table, $field);
         } else {
             $dbman->add_field($table, $field);
         }
diff --git a/version.php b/version.php
index 2dc8a42..41646e6 100644
--- a/version.php
+++ b/version.php
@@ -35,10 +35,10 @@ if (!isset( $plugin)) {
 }
 
 $plugin->component = 'mod_game';  // Full name of the plugin (used for diagnostics).
-$plugin->version   = 2017062702;  // The current module version (Date: YYYYMMDDXX).
+$plugin->version   = 2017062801;  // The current module version (Date: YYYYMMDDXX).
 $plugin->requires  = 2010112400;  // Requires Moodle 2.0.
 $plugin->cron      = 0;           // Period for cron to check this module (secs).
-$plugin->release   = '2017-06-27';
+$plugin->release   = '2017-06-28';
 $plugin->maturity = MATURITY_STABLE;
 
 if ($useplugin != 2) {