diff --git a/class/ReportBuilder.php b/class/ReportBuilder.php
index 0038347..54fffec 100644
--- a/class/ReportBuilder.php
+++ b/class/ReportBuilder.php
@@ -26,7 +26,32 @@ class ReportBuilder
     }
 }
 
-class Answer {
+class TeXUtils
+{
+    static public function processCodeInserts(string $str) : string
+    {
+        $parts = explode("`", $str);
+        $output = "";
+        for ($i = 0; $i < count($parts); $i++) {
+            $output .= $parts[$i];
+            if ($i < count($parts) - 1) {
+                if (($i % 2) === 0) {
+                    $output .= "\\texttt{";
+                } else {
+                    $output .= "}";
+                }
+            }
+        }
+        return $output;
+    }
+
+    static public function escape(string $str) : string {
+        return preg_replace("/([#%&])/", "\\\\$1", $str);
+    }
+}
+
+class Answer
+{
     const CORRECT = "Correct";
     const INCORRECT = "Incorrect";
 
@@ -34,19 +59,22 @@ class Answer {
     private string $type; // Answer's type
     private float $ratio; // Answer's ratio
 
-    public function __construct(string $type, string $text, float $ratio) {
+    public function __construct(string $type, string $text, float $ratio)
+    {
         $this->type = $type;
         $this->text = $text;
         $this->ratio = $ratio;
     }
 
     // Convert answer into TeX format.
-    public function genTeX(): string {
-        return "\\answer" . $this->type . "{" . $this->ratio . "}{" .  $this->text . "}\n";
+    public function genTeX(): string
+    {
+        return "\\answer" . $this->type . "{" . $this->ratio . "}{" . $this->text . "}\n";
     }
 }
 
-class Challenge {
+class Challenge
+{
     private string $question;
     private array $answers;
 
@@ -56,23 +84,26 @@ class Challenge {
         for ($i = 0; $i < count($data["answers"]); $i++) {
             $answer = $data["answers"][$i];
             $ratio = $data["answer_ratio"][$i];
-            $type = $answer === $data["correctAnswer"] ? Answer::CORRECT : Answer::INCORRECT;
+            $type = $answer === $data["correct_answer"] ? Answer::CORRECT : Answer::INCORRECT;
             $this->answers[] = new Answer($type, $answer, $ratio);
         }
     }
 
-    public function getQuestion(): string {
+    public function getQuestion(): string
+    {
         return $this->question;
     }
 
-    public function getAnswers(): array {
+    public function getAnswers(): array
+    {
         return $this->answers;
     }
 
     // Generate TeX representation.
-    public function genTeX(): string {
+    public function genTeX(): string
+    {
         $tex = "\\begin{question}{" . $this->question . "}\n";
-        foreach ($this->answers as $answer) {
+        foreach ($this->answers as &$answer) {
             $tex .= $answer->genTeX();
         }
         $tex .= "\\end{question}\n";
@@ -80,23 +111,30 @@ class Challenge {
     }
 }
 
-class ReportSection {
+class ReportSection
+{
     private string $title;
     private array $challenges;
-    function __construct(string $title, array $stats) {
-        $this->stats = $stats;
+
+    function __construct(string $title, array $challenges)
+    {
+        $this->title = $title;
+        $this->challenges = array_map(fn($ch) => new Challenge($ch), $challenges);
     }
 
-    function getChallenges() : array {
+    function getChallenges(): array
+    {
         return $this->challenges;
     }
 
-    function getTitle() : string {
+    function getTitle(): string
+    {
         return $this->title;
     }
 
     // Generate TeX representation of this report.
-    function genTeX() : string {
+    function genTeX(): string
+    {
         $tex = "\\begin{quiz}{" . $this->title . "}\n";
         foreach ($this->challenges as $challenge) {
             $tex .= $challenge->genTeX();
@@ -110,6 +148,7 @@ class Report
 {
     private string $title;
     private array $sections;
+
     function __construct(string $title)
     {
         $this->title = $title;
@@ -118,18 +157,20 @@ class Report
 
 
     // Add a new section to the report.
-    function addSection(ReportSection &$section) : void
+    function addSection(ReportSection &$section): void
     {
         $this->sections[] = $section;
     }
 
     // Generate TeX representation.
-    function genTeX() :string
+    function genTeX(): string
     {
         $tex = "";
         foreach ($this->sections as $section) {
             $tex .= $section->genTeX() . "\n\n";
         }
+        $tex = TeXUtils::processCodeInserts($tex);
+        $tex = TeXUtils::escape($tex);
         return $tex;
     }
 
@@ -137,7 +178,8 @@ class Report
     const TITLE_FILE = "title.tex";
 
     // Save TeX representation.
-    function saveTeX(string $dir) : void {
+    function saveTeX(string $dir): void
+    {
         file_put_contents($dir . DIRECTORY_SEPARATOR . self::CONTENT_FILE, $this->genTeX());
         file_put_contents($dir . DIRECTORY_SEPARATOR . self::TITLE_FILE, $this->title);
     }
diff --git a/interface.php b/interface.php
index 2e495cd..64bc8b3 100644
--- a/interface.php
+++ b/interface.php
@@ -551,7 +551,26 @@ function generate_report_by_groups(ReqHandler &$rh, array $params): string
     }
 
     // generate latex
-    $report->saveTeX("report/");
+    $report_dir = "report";
+    $report->saveTeX($report_dir . DIRECTORY_SEPARATOR . "stats");
+
+    // run LuaLaTeX twice
+    chdir($report_dir);
+    $tex_cmd = "lualatex -interaction=nonstopmode report.tex";
+    exec($tex_cmd);
+    exec($tex_cmd);
+
+    $output = "report.pdf";
+
+    header("Content-Type: application/pdf");
+    header("Content-Length: " . filesize($output));
+
+    // deploy the generated PDF
+    $pdf = fopen($output, "r");
+    if ($pdf !== false) {
+        fpassthru($pdf);
+        fclose($pdf);
+    }
 
     return "OK";
 }
@@ -583,7 +602,7 @@ $rh->add("delete_games", ["ids"], PRIVILEGE_CREATOR, "delete_games", RESP_PLAIN,
 $rh->add("export_game_file_csv", ["gameid"], PRIVILEGE_CREATOR, "export_game_file_csv", RESP_NONE, "Export game CSV file.");
 $rh->add("get_results_by_gameid", ["gameid"], PRIVILEGE_CREATOR, "get_results_by_gameid", RESP_JSON, "Get game results.");
 $rh->add("generate_detailed_stats", ["gameid", "testids"], PRIVILEGE_CREATOR, "generate_detailed_game_stats", RESP_JSON, "Generate detailed game stats.");
-$rh->add("generate_report_by_groups", ["gameid", "groups"], PRIVILEGE_CREATOR, "generate_report_by_groups", RESP_PLAIN, "Generate game reports for each specified group.");
+$rh->add("generate_report_by_groups", ["gameid", "groups"], PRIVILEGE_CREATOR, "generate_report_by_groups", RESP_NONE, "Generate game reports for each specified group.");
 $rh->add("delete_tests", ["ids"], PRIVILEGE_CREATOR, "delete_tests", RESP_PLAIN, "Delete tests.");
 
 // execute processing if user is a creator