diff --git a/backup/moodle2/restore_game_activity_task.class.php b/backup/moodle2/restore_game_activity_task.class.php
index 8961f83..861a198 100644
--- a/backup/moodle2/restore_game_activity_task.class.php
+++ b/backup/moodle2/restore_game_activity_task.class.php
@@ -15,6 +15,8 @@
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
+ * Restores a game
+ *
  * @package mod_game
  * @subpackage backup-moodle2
  * @copyright 2007 Vasilis Daloukas
diff --git a/backup/moodle2/restore_game_stepslib.php b/backup/moodle2/restore_game_stepslib.php
index 9e03b24..fd9b181 100644
--- a/backup/moodle2/restore_game_stepslib.php
+++ b/backup/moodle2/restore_game_stepslib.php
@@ -27,6 +27,8 @@ defined('MOODLE_INTERNAL') || die();
 
 /**
  * Structure step to restore one game activity
+ * @copyright 2007 Vasilis Daloukas
+ * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 class restore_game_activity_structure_step extends restore_activity_structure_step {
 
diff --git a/classes/event/course_module_viewed.php b/classes/event/course_module_viewed.php
index 119eb17..4800141 100644
--- a/classes/event/course_module_viewed.php
+++ b/classes/event/course_module_viewed.php
@@ -57,8 +57,9 @@ class course_module_viewed extends \core\event\course_module_viewed {
 
     /**
      * Create instance of event.
-     * @param stdClass $game
-     * @param stdClass $context
+     *
+     * @param $game
+     * @param $context
      *
      * @return event
      */
diff --git a/cross/cross_class.php b/cross/cross_class.php
index b10cdd3..ae00d92 100644
--- a/cross/cross_class.php
+++ b/cross/cross_class.php
@@ -512,8 +512,8 @@ class Cross
     /**
      * Swaps two variables.
      *
-     * @param $a
-     * @param $b
+     * @param &$a
+     * @param &$b
      */
     public function swap( &$a, &$b) {
         $temp = $a;
diff --git a/hiddenpicture/play.php b/hiddenpicture/play.php
index cbf7b73..8bdf068 100644
--- a/hiddenpicture/play.php
+++ b/hiddenpicture/play.php
@@ -24,6 +24,7 @@
  */
 
 defined('MOODLE_INTERNAL') || die();
+
 /**
  * Plays the game "Hidden picture"
  *
@@ -112,7 +113,13 @@ function game_hiddenpicture_continue( $id, $game, $attempt, $hiddenpicture, $con
     game_hiddenpicture_play( $id, $game, $attempt, $newrec, false, $context);
 }
 
-// Create the game_hiddenpicture record.
+
+/**
+ * Create the game_hiddenpicture record.
+ *
+ * @param $game
+ * @param $attempt
+ */
 function game_hiddenpicture_selectglossaryentry( $game, $attempt) {
     global $CFG, $DB, $USER;
 
@@ -223,6 +230,16 @@ function game_hiddenpicture_selectglossaryentry( $game, $attempt) {
     return $newrec;
 }
 
+/**
+ * Plays the game "Hidden picture"
+ *
+ * @param $id
+ * @param $game
+ * @param $attempt
+ * @param $hiddenpicture
+ * @param $showsolution
+ * @param $context
+ */
 function game_hiddenpicture_play( $id, $game, $attempt, $hiddenpicture, $showsolution, $context) {
     if ($game->toptext != '') {
         echo $game->toptext.'<br>';
@@ -256,6 +273,12 @@ function game_hiddenpicture_play( $id, $game, $attempt, $hiddenpicture, $showsol
     }
 }
 
+/**
+ * "Hidden picture" compute score
+ *
+ * @param $game
+ * @param $hiddenpicture
+ */
 function game_hidden_picture_computescore( $game, $hiddenpicture) {
     $correct = $hiddenpicture->correct;
     if ($hiddenpicture->found) {
@@ -272,6 +295,15 @@ function game_hidden_picture_computescore( $game, $hiddenpicture) {
     return $percent;
 }
 
+/**
+ * Show hidden picture
+ *
+ * @param $id
+ * @param $game
+ * @param $attempt
+ * @param $hiddenpicture
+ * @param $showsolution
+ */
 function game_hiddenpicture_showhiddenpicture( $id, $game, $attempt, $hiddenpicture, $showsolution,
             $offsetquestions, $correctquestions) {
     global $DB;
@@ -300,6 +332,13 @@ function game_hiddenpicture_showhiddenpicture( $id, $game, $attempt, $hiddenpict
     game_showpicture( $id, $game, $attempt, $query, $cells, $foundcells, true);
 }
 
+/**
+ * hidden picture. show question glossary
+ *
+ * @param $game
+ * @param $id
+ * @param $query
+ */
 function game_hiddenpicture_showquestion_glossary( $game, $id, $query) {
     global $CFG, $DB;
 
@@ -331,6 +370,16 @@ function game_hiddenpicture_showquestion_glossary( $game, $id, $query) {
     echo "</form><br>\n";
 }
 
+/**
+ * Check main question
+ *
+ * @param $id
+ * @param $game
+ * @param $attempt
+ * @param $hiddenpicture
+ * @param $finishattempt
+ * @param $context
+ */
 function game_hiddenpicture_check_mainquestion( $id, $game, &$attempt, &$hiddenpicture, $finishattempt, $context) {
     global $CFG, $DB;
 
@@ -396,6 +445,17 @@ function game_hiddenpicture_check_mainquestion( $id, $game, &$attempt, &$hiddenp
     return false;
 }
 
+/**
+ * Show picture
+ *
+ * @param $id
+ * @param $game
+ * @param $attempt
+ * @param $query
+ * @param $cells
+ * @param $foundcells
+ * @param $usemap
+ */
 function game_showpicture( $id, $game, $attempt, $query, $cells, $foundcells, $usemap) {
     global $CFG;
 
diff --git a/lib.php b/lib.php
index 08dd788..faeb094 100644
--- a/lib.php
+++ b/lib.php
@@ -263,7 +263,7 @@ function game_user_outline($course, $user, $mod, $game) {
 }
 
 /**
- * Print a detailed representation of what a user has done with a given particular instance of this module, for user activity reports.
+ * Print a detailed representation of what a user has done with a given particular game,(user activity reports).
 
  * @param stdClass $course
  * @param stdClass $user
@@ -379,7 +379,7 @@ function game_get_user_grades($game, $userid=0) {
 }
 
 /**
- * Must return an array of user records (all data) who are participants for a given instance of game. Must include every user involved
+ * Must return an array of user records (all data) who are participants for a given instance of game.
  *
  * @param int $gameid ID of an instance of this module
  * @return mixed boolean/array of students
@@ -1208,7 +1208,7 @@ function mod_game_pluginfile($course, $cm, $context, $filearea, $args, $forcedow
 }
 
 /**
- * Implementation of the function for printing the form elements that control whether the course reset functionality affects the Game.
+ * Add reset buttons to form.
  *
  * @param object $mform form passed by reference
  */
diff --git a/locallib.php b/locallib.php
index dbd775e..a2bb879 100644
--- a/locallib.php
+++ b/locallib.php
@@ -1071,7 +1071,8 @@ function game_get_user_attempts( $gameid, $userid, $status = 'finished') {
 
 
 /**
- * Returns an unfinished attempt (if there is one) for the given user on the given game. This function does not return preview attempts.
+ * Returns an unfinished attempt (if there is one) for the given user on the given game.
+ * This function does not return preview attempts.
  *
  * @param integer $gameid the id of the game.
  * @param integer $userid the id of the user.
@@ -1555,7 +1556,7 @@ function game_filterquestion_answer( $questiontext, $questionid, $contextid, $co
  * @param $text
  * @param $courseid
  */
- function game_filtertext( $text, $courseid) {
+function game_filtertext( $text, $courseid) {
     $formatoptions = new stdClass();
     $formatoptions->noclean = true;
     $formatoptions->filter = 1;
@@ -2518,7 +2519,7 @@ function game_strpos( $haystack, $needle, $offset = 0) {
 /**
  * show query
  *
- * @param object $game the game 
+ * @param object $game the game
  * @param $query
  * @param $text
  */
diff --git a/mod_form.php b/mod_form.php
index ee85732..6c3c815 100644
--- a/mod_form.php
+++ b/mod_form.php
@@ -17,7 +17,7 @@
 /**
  * Form for creating and modifying a game
  *
- * @package   game
+ * @package   mod_game
  * @author    Alastair Munro <alastair@catalyst.net.nz>
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
diff --git a/print.php b/print.php
index ad90423..75a83b8 100644
--- a/print.php
+++ b/print.php
@@ -55,9 +55,9 @@ function game_print( $game, $update, $context) {
 /**
  * Prints a cross.
  *
- * @param stdClass $game
-   @param boolean $update
- * @param stdClass $context
+ * @param $game
+   @param $update
+ * @param $context
  */
 function game_print_cross( $game, $update, $context) {
     require( "cross/play.php");
diff --git a/sudoku/class.Sudoku.php b/sudoku/class.Sudoku.php
index 910e74c..acb7608 100644
--- a/sudoku/class.Sudoku.php
+++ b/sudoku/class.Sudoku.php
@@ -144,10 +144,14 @@ class objects {
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 class cell extends objects {
+    /** @var $r */
     protected $r;
+    /** @var $c */
     protected $c;
 
+    /** @var $state */
     protected $state = array();
+    /** @var $applied */
     protected $applied = false;
 
     /**
@@ -746,7 +750,10 @@ class r extends rcs {
      */
 
     /**
-     * @see RCS::coupling
+     * see RCS::coupling
+     *
+     * @param $therow
+     * @param $thecolumn
      */
     public function coupling($therow, $thecolumn) {
         return $thestate = $this->_coupling($thecolumn);
@@ -755,7 +762,7 @@ class r extends rcs {
     /**
      * Heavy lifting for row/column coupling calculations.
      *
-     * @see RCS::coupling
+     * RCS::coupling
      * @param integer $theIndex the index of the cell within the row or column.
      * @return integer the "coupling coefficient" for the cell.  The sum of the
      *          sizes of the intersection between this and all other
diff --git a/sudoku/sdd/class.SDD.php b/sudoku/sdd/class.SDD.php
index a20a356..97aa00d 100644
--- a/sudoku/sdd/class.SDD.php
+++ b/sudoku/sdd/class.SDD.php
@@ -71,8 +71,6 @@ class sdd {
 
     /*
      * Close the log file.
-     *
-     * @abstract
      */
     public function close() {
     }
@@ -279,7 +277,6 @@ class sdd {
     /*
      * Write a debugging value to a log file.
      *
-     * @abstract
      * @param mixed Data to be logged.
      * @param string $theHeader [optional] string to be emitted prior to
      *               logging the data.  By default it is a date/time
@@ -348,7 +345,6 @@ class sdd {
     /*
      * Write data to the log file.
      *
-     * @abstract
      * @parameter string $theData [by reference] the data to be written
      *                       into the log file.
      * @return integer the number of bytes written into the log file.