diff --git a/pmwiki_recipes/exercises.php b/pmwiki_recipes/exercises.php
index 9d94e48..ed7fb7c 100644
--- a/pmwiki_recipes/exercises.php
+++ b/pmwiki_recipes/exercises.php
@@ -6,6 +6,10 @@ error_reporting(0);
 # generate exercises based on wiki content and its structure
 # 
 # still to implement (cf http://fabien.benetou.fr/Cookbook/Cognition#DailyExercisesFeed )
+#	refactor in classes?
+# 	random type is not implemented properly enough for score tracking
+#		e.g. highest score from random appear as other exercise
+#		after 1 random exercise, going back to the same type of the last picked exercise
 #	which of those group corresponds the graph visualization V, A, B or C? 
 #		using groupnetworkvisualization.php
 #	what is the correct order for pages A, B and C on descending criteria i A>B>C? A>C>B? B>C>A? B>A>C? C>B>A? C>A>B?
@@ -24,11 +28,12 @@ error_reporting(0);
 #	does page A contains word X, Y or Z? (type=pagehasexpression)
 #	which of those page corresponds the updates visualization V, A, B or C? (type=historyvisualization)
 #	is page A linked to page B? (type=pagelink)
-# consider a difficulty parameter
+# difficulty parameter
 #	should be linked to the counter
 #	e.g. increasing the number of possibilities (at least 1 out of 5 pages instead of at least 1 out of 3)
-# consider doing a trip rather than random jumps
+# do a graph traversal rather than random jumps
 #	i.e. if pick randomly from the linked pages or from the group or from the the whole wiki of the previous page
+#	consider https://research.cc.gatech.edu/inc/game-forge 
 
 
 $RecipeInfo['Exercises']['Version'] = '2015-16-08';
@@ -43,11 +48,15 @@ function Exercises($pagename, $auth){
 	$difficulty = (int) $_GET["difficulty"];
 	list($group,$page) = explode(".",$pagename);
 
-	$availableexercisetypes = array("pagelink", "expressioninpage", "pagehasexpression", "historyvisualization");
-	//should also test if the pim_functions.php generated the PJS has been loaded, else not make historyvisualization available
+	$availableexercisetypes = array("pagelink", "expressioninpage", "pagehasexpression");
+	if (file_exists($FarmD."/pub/visualization/edits_per_page/" ))
+		//the pim_functions.php generated the PJS has been loaded before
+		$availableexercisetypes[] = "historyvisualization";
 
-	if ($type=="random" || $type=="")
-		$type= $availableexercisetypes[rand(0,count($availableexercisetypes)-1)];
+	if ($type=="random" || $type=="") {
+		$type= $availableexercisetypes[array_rand($availableexercisetypes)];
+		$random=true;
+	}
 
 	$result = "";
 	$verbatimresult = "";
@@ -61,10 +70,12 @@ function Exercises($pagename, $auth){
 	// this could also be consider a difficulty, the shorter the harder
 	// it can be overwritten per each exercise
 
+	// tracking the current score
 	$counterparam = "";
 	if ( $counter > 0) {
 		$counterparam = "counter=$counter&";
 	}
+
 	// the pattern should be improve, e.g. remove PmWiki. , RecentChanges, GroupFooter, GroupHeader, Template, ...
 	if ($group == "AllPages"){
 		// equivalent to getting ALL pages
@@ -392,17 +403,36 @@ Markup("exercisesresults", "directives", "/\(:exercisesresults:\)/", ExercisesRe
 #	consider first sparklines for visuals
 function ExercisesResults(){
 	global $ScriptUrl, $FarmD, $Author;
+	$availableexercisetypes = array("pagelink", "expressioninpage", "pagehasexpression", "historyvisualization");
 	$activityfile = $FarmD."/wiki.d/.exercisesscores";
         if (file_exists($activityfile)) {
 		$raw_scores = file_get_contents($activityfile);
 		$allscores = explode("\n",$raw_scores);
+		rsort($allscores,SORT_NUMERIC);
+		//dirty, but array_filter with an lambda to test for current exercise didn't work 
 		foreach ($allscores as $score ) {
 			list($counter,$author,$type,$time) = explode(",",$score);
-			if ($Author == $author) $author = "<b>$author</b>";
-			// $Author somehow never gets initialized
-			if ($counter != "")
-				$past_scores .= "<li> $counter done by $author doing $type at $time</li>\n";
+			if ($counter.$author.$type.$time != "")
+				$structuredanswers[] = array("counter"=>$counter,"author"=>$author,"type"=>$type,"time"=>$time);
+		}
+		// could instead filter by exercise and sort by highest score, listing the top3 score per per exercise
+		$past_scores .= "<table><tr>";
+		foreach ($availableexercisetypes as $exercisetype){
+			$past_scores .= "<td><a href=\"?action=Exercises&type=$exercisetype\">$exercisetype</a></td>";
+		}
+		$past_scores .= "</tr><tr>";
+		foreach ($availableexercisetypes as $exercisetype){
+			$past_scores .= "<td valign=\"top\">";
+			$answers_added = 1;
+			foreach ($structuredanswers as $sa){
+				if ($sa["type"]==$exercisetype && $answers_added<4){
+					$past_scores .= "".$sa["counter"]." done by ".$sa["author"]." (".date("H:m m/d/y",$sa["time"]).")<br/>";
+					$answers_added++;
+				}
+			}
+			$past_scores .= "</td>";
 		}
+		$past_scores .= "</tr></table>";
 	} else {
 		$past_scores = "Currently no scores have been recorded. Consider starting an exercise first";
 		// print "Go above the minimum threshold of good answers while being logged in.";
diff --git a/shell_scripts/pmwiki_recipes_info_listing b/shell_scripts/pmwiki_recipes_info_listing
index e815e00..e91f172 100755
--- a/shell_scripts/pmwiki_recipes_info_listing
+++ b/shell_scripts/pmwiki_recipes_info_listing
@@ -41,8 +41,8 @@ do
 	echo "* functions";
 	for FUNCTION in `grep ^function $SCRIPT | sed "s/^function \(.*\)(.*/\1/"`
 	do
-		PARAMS=`grep "^function $FUNCTION" $SCRIPT | sed "s/^function $FUNCTION(\(.*\)).*/\1/"`
-		FUNCTIONLINE=`grep -n "^function $FUNCTION" $SCRIPT | sed "s/:.*//"`;
+		PARAMS=`grep "^function $FUNCTION(" $SCRIPT | sed "s/^function $FUNCTION(\(.*\)).*/\1/"`
+		FUNCTIONLINE=`grep -n "^function $FUNCTION(" $SCRIPT | sed "s/:.*//"`;
 		echo "** [[$REPOSITORYURL/$SCRIPT#l$FUNCTIONLINE|$FUNCTION($PARAMS)]]";
 	done
 	echo "";