diff --git a/class/TestMgr.php b/class/TestMgr.php
index e4729d1..46dce6e 100644
--- a/class/TestMgr.php
+++ b/class/TestMgr.php
@@ -18,7 +18,8 @@ class TestSummary
     private float $percentage; // Ratio of correct answers
 
     // Calculate percentage.
-    private function calculatePercentage() : void {
+    private function calculatePercentage(): void
+    {
         if ($this->challengeN > 0) {
             $this->percentage = $this->correctAnswerN / (double)$this->challengeN * 100.0;
         } else { // avoid division by zero
@@ -288,12 +289,12 @@ class Test extends AutoStoring
         return $this->gameId;
     }
 
-    public function isConcluded() : bool
+    public function isConcluded(): bool
     {
         return $this->state === self::TEST_CONCLUDED;
     }
 
-    public function isOngoing() : bool
+    public function isOngoing(): bool
     {
         return $this->state === self::TEST_ONGOING;
     }
@@ -332,25 +333,28 @@ class TestMgr
     }
 
     // Update test in the database.
-    function updateTest(Test &$test): void {
+    function updateTest(Test &$test): void
+    {
         $a = $test->toArray();
         $this->db->update($a);
     }
 
     // Add test to the database.
-    function addTest(Game &$game, User &$user): Test {
+    function addTest(Game &$game, User &$user): Test
+    {
         // create new test
-        $test = new Test($this,$game, $user);
+        $test = new Test($this, $game, $user);
 
         // insert into database
         $a = $test->toArray(["_id"]);
         $a = $this->db->insert($a);
 
-        $test = new Test($this,$a);
+        $test = new Test($this, $a);
         return $test;
     }
 
-    function addOrContinueTest(Game &$game, User &$user): Test|null {
+    function addOrContinueTest(Game &$game, User &$user): Test|null
+    {
         // check if the user had taken this test before
         $fetch_criteria = [["gameid", "=", (int)$game->getId()], "AND", ["nickname", "=", $user->getNickname()]];
         $previous_tests = $this->db->findBy($fetch_criteria);
@@ -384,12 +388,14 @@ class TestMgr
     }
 
     // Delete test from the database.
-    function deleteTest(string $testid): void {
+    function deleteTest(string $testid): void
+    {
         $this->db->deleteById($testid);
     }
 
     // Get concluded tests by game ID and nickname.
-    function getConcludedTests(string $gameid, string $nickname): array {
+    function getConcludedTests(string $gameid, string $nickname): array
+    {
         $fetch_criteria = [["gameid", "=", (int)$gameid], "AND", ["nickname", "=", $nickname], "AND", ["state", "=", Test::TEST_CONCLUDED]];
         $test_data_array = $this->db->findBy($fetch_criteria);
         $tests = [];
@@ -489,8 +495,10 @@ class TestMgr
                 $challenge_idx = $challenge_indices[$idhash];
 
                 // add up player answer
-                $answer_idx = array_search($challenge["answers"][$challenge["player_answer"]], $aggregated[$challenge_idx]["answers"]); // transform player answer index to report answer index
-                $aggregated[$challenge_idx]["player_answers"][(int)$answer_idx]++;
+                if (trim($challenge["player_answer"]) !== "") {
+                    $answer_idx = array_search($challenge["answers"][$challenge["player_answer"]], $aggregated[$challenge_idx]["answers"]); // transform player answer index to report answer index
+                    $aggregated[$challenge_idx]["player_answers"][(int)$answer_idx]++;
+                }
             }
         }
 
@@ -514,7 +522,8 @@ class TestMgr
     }
 
     // Upgrade test. Just load tests and save them.
-    function upgradeTests(array $ids = []) : void {
+    function upgradeTests(array $ids = []): void
+    {
         $a = [];
         if ($ids === []) {
             $a = $this->db->findAll();
@@ -529,10 +538,11 @@ class TestMgr
     }
 
     // Extract timed test IDs. Scan the database for tests with time limit ON.
-    function extractExpiredTimedTestIds(bool $ongoingOnly = true) : array {
+    function extractExpiredTimedTestIds(bool $ongoingOnly = true): array
+    {
         $query = [["time_limited", "=", true], "AND", ["end_limit_time", "<", time()]];
         if ($ongoingOnly) {
-            $query = [ ...$query, "AND", ["state", "=", TEST_ONGOING]];
+            $query = [...$query, "AND", ["state", "=", TEST_ONGOING]];
         }
 
         $qb = $this->db->createQueryBuilder();
diff --git a/game_manager_frame.php b/game_manager_frame.php
index a74a687..1faeef3 100644
--- a/game_manager_frame.php
+++ b/game_manager_frame.php
@@ -116,7 +116,8 @@ if (!get_autologin_state() || (($user_data["privilege"] !== PRIVILEGE_CREATOR) &
                         </td>
                         <td>
                             <input type="button" value="Gyors áttekintés" onclick="list_results_by_game(EDITED_GAME)">
-                            <input type="button" value="Részletes megjelenítés" onclick="window.open(`result_analyzer.php?game_id=${EDITED_GAME._id}`)">
+                            <input type="button" value="Részletes megjelenítés" onclick="window.open(`result_analyzer.php?game_id=${EDITED_GAME._id}`)"><br>
+                            <input type="button" value="Csoportonkénti jelentés" onclick="show('report_generator')">
                         </td>
                     </tr>
                 </table>
@@ -138,6 +139,19 @@ if (!get_autologin_state() || (($user_data["privilege"] !== PRIVILEGE_CREATOR) &
     </section>
 </section>
 
+<section class="window" shown="false" id="report_generator">
+    <section class="window-inner">
+        <input type="text" placeholder="Csoportok" value="" id="report_groups">
+        <input type="text" placeholder="Szűrő" value="" id="report_filter">
+        <select id="report_output_type">
+            <option value="pdf">PDF</option>
+            <option value="tex">TeX</option>
+        </select>
+        <input type="button" value="Előállítás" onclick="generate_game_report_by_groups()">
+        <input type="button" value="Bezárás" onclick="hide('report_generator')">
+    </section>
+</section>
+
 <script>
     list_all_games();
 </script>
diff --git a/globals.php b/globals.php
index 47893d3..ea0e4e9 100644
--- a/globals.php
+++ b/globals.php
@@ -16,8 +16,10 @@ const MAIN_URL = "main.php";
 const SESSION_NAME = "spreadquiz_sid";
 const MAINTENANCE_FLAG_FILE = "MAINTENANCE";
 const MISSING_IMAGE_PLACEHOLDER = "media/image-missing_120px.png";
-const REPORT_DIR = DATADIR . DIRECTORY_SEPARATOR . "reports";
-
+const REPORT_DIR = "report";
+const REPORT_TEMPLATE_DIR = REPORT_DIR . DIRECTORY_SEPARATOR . "template";
+const REPORT_PDF_OUTPUT_DIR = REPORT_DIR . DIRECTORY_SEPARATOR . "output";
+const TEX_ENGINE = "xelatex";
 
 session_name(SESSION_NAME);
 
@@ -34,6 +36,7 @@ function init_datadir() {
         mkdir(DATADIR);
         mkdir(GAMEMEDIA_DIR);
         mkdir(REPORT_DIR);
+        mkdir(REPORT_PDF_OUTPUT_DIR);
     }
 }
 
diff --git a/interface.php b/interface.php
index 79e3384..5d76a84 100644
--- a/interface.php
+++ b/interface.php
@@ -533,16 +533,35 @@ function generate_report_by_groups(ReqHandler &$rh, array $params): string
 
     $gameid = trim($params["gameid"]);
     $filter = trim($params["filter"] ?? "");
-    $groups = explode_list(trim($params["groups"])); // TODO: lehessen több csoportra is
+    $groups = explode_list(trim($params["groups"]));
     $outtype = trim($params["outtype"] ?? "pdf");
 
+    // only PDF and TEX are valid
+    if (!in_array($outtype, ["pdf", "tex"])) {
+        return "FAIL";
+    }
+
     $game = $gameMgr->getGame($gameid);
 
     // verify game and access
-    if (($game === null) || (!$game->isUserContributorOrOwner($user->getNickname()) || !$user->hasQuizmasterPrivilege())) {
+    if (($game === null) || ((!$game->isUserContributorOrOwner($user->getNickname()) && !$user->hasQuizmasterPrivilege()))) {
         return "FAIL";
     }
 
+    // create destination directory and copy TeX frame file
+    $repId = uniqid($outtype);
+    $buildDir = REPORT_PDF_OUTPUT_DIR . DIRECTORY_SEPARATOR . $repId;
+    mkdir($buildDir);
+
+    $iter = new RecursiveDirectoryIterator(REPORT_TEMPLATE_DIR, FilesystemIterator::SKIP_DOTS);
+    foreach ($iter as $dir_item) {
+        if (!$iter->isDir()) {
+            $src = $dir_item->getPathname();
+            $dst = $buildDir . DIRECTORY_SEPARATOR . $dir_item->getFilename();
+            copy($src, $dst);
+        }
+    }
+
     // assemble report
     $report = new Report($game->getName());
     foreach ($groups as $groupname) {
@@ -552,28 +571,39 @@ function generate_report_by_groups(ReqHandler &$rh, array $params): string
     }
 
     // generate latex
-    $report_dir = "report";
-    $content_dir = $report_dir . DIRECTORY_SEPARATOR . "stats";
-    $report->saveTeX($content_dir);
+    $report->saveTeX($buildDir);
 
-    $output = "";
-    $contentType = "";
     if ($outtype === "pdf") {
         // run LuaLaTeX twice
-        chdir($report_dir);
-        $tex_cmd = "lualatex -interaction=nonstopmode report.tex";
+        chdir($buildDir);
+        $tex_cmd = TEX_ENGINE . " -interaction=nonstopmode report.tex";
         exec($tex_cmd);
         exec($tex_cmd);
 
-        $output = "report.pdf";
+        // rename output
+        $origOutput = "report.pdf";
+        $output = $repId . ".pdf";
+        rename($origOutput, $output);
+
         $contentType = "application/pdf";
-    } else {
-        $output = $content_dir . DIRECTORY_SEPARATOR . "content.tex";
-        $contentType = "text/plain";
+    } else if ($outtype === "tex") {
+        $output = $buildDir . DIRECTORY_SEPARATOR . $repId . ".zip";
+        $zip = new ZipArchive();
+        $zip->open($output, ZipArchive::CREATE | ZipArchive::OVERWRITE);
+        $files = glob($buildDir . DIRECTORY_SEPARATOR . "*.tex");
+        foreach ($files as $file) {
+            $zip->addFile($file, basename($file));
+        }
+        $zip->addFromString("request.txt", "gameid: ${gameid}\ngroups: " . join(", ", $groups) . "\nfilter: ${filter}\nouttype: ${outtype}\n");
+        $zip->addFromString("request.url", $_SERVER["SERVER_NAME"] . ":" . $_SERVER["SERVER_PORT"] . $_SERVER["REQUEST_URI"]);
+        $zip->close();
+        $contentType = "application/zip";
     }
 
+    // set content type
     header("Content-Type: ${contentType}");
     header("Content-Length: " . filesize($output));
+    header("Content-Disposition: attachment; filename=" . basename($output));
 
     // deploy the generated PDF
     $f = fopen($output, "r");
diff --git a/js/gamemgr.js b/js/gamemgr.js
index 7ddf486..1404720 100644
--- a/js/gamemgr.js
+++ b/js/gamemgr.js
@@ -371,6 +371,17 @@ function list_results_by_game(game) {
     });
 }
 
+function generate_game_report_by_groups() {
+    let gameid = EDITED_GAME["_id"];
+    let filter = document.getElementById("report_filter").value.trim()
+    let groups = document.getElementById("report_groups").value.trim()
+    let outtype = document.getElementById("report_output_type").value;
+
+    let report_url = `interface.php?action=generate_report_by_groups&gameid=${gameid}&groups=${groups}&filter=${filter}&outtype=${outtype}`;
+    report_url = report_url.replace("#", "%23");
+    window.open(report_url, "_blank");
+}
+
 // function hint_all_groups(target_element_id) {
 //     const hintbox_insert_fn = (record) => {
 //         let targetF = document.getElementById(target_element_id);
diff --git a/js/result_analyzer.js b/js/result_analyzer.js
index 513b7ff..58ac09b 100644
--- a/js/result_analyzer.js
+++ b/js/result_analyzer.js
@@ -140,11 +140,17 @@ function generate_report() {
             let report_display = statsTab.document.getElementById("report_display");
             report_display.innerHTML = "";
 
+            let ch_n = 0;
             stats.forEach((challenge) => {
                 let challenge_box = document.createElement("section");
                 challenge_box.classList.add("challenge");
                 challenge_box.style.width = "100%";
 
+                let seq_num = document.createElement("section");
+                seq_num.classList.add("seq-num");
+                seq_num.innerText = ++ch_n;
+                challenge_box.append(seq_num);
+
                 let img_url = challenge["image_url"];
                 if (img_url !== "") {
                     let fig = document.createElement("img");
diff --git a/report/stats/title.tex b/report/stats/title.tex
deleted file mode 100644
index 147f3d5..0000000
--- a/report/stats/title.tex
+++ /dev/null
@@ -1 +0,0 @@
-Digit kvíz I-III eredmények kurzusonként
\ No newline at end of file
diff --git a/report/progressbar.sty b/report/template/progressbar.sty
similarity index 100%
rename from report/progressbar.sty
rename to report/template/progressbar.sty
diff --git a/report/report.tex b/report/template/report.tex
similarity index 92%
rename from report/report.tex
rename to report/template/report.tex
index 52d7721..bef3bad 100644
--- a/report/report.tex
+++ b/report/template/report.tex
@@ -108,7 +108,7 @@
 
 \begin{document}
 \begin{center}
-    \Huge \IfFileExists{stats/title.tex}{\input{stats/title.tex}}{Kvíz eredmények}
+    \Huge \IfFileExists{stats/title.tex}{\input{title.tex}}{Kvíz eredmények}
 \end{center}
 
 \Large
@@ -116,6 +116,6 @@
 \normalsize
 \clearpage
 
-\inputIfFileExists{stats/content.tex}
+\inputIfFileExists{content.tex}
 
 \end{document}