diff --git a/registration-system/view/signups/game1/game.js b/registration-system/view/signups/game1/game.js
deleted file mode 100644
index 6d0a734fba0542f0bd4ffecfe7cbee364095a697..0000000000000000000000000000000000000000
--- a/registration-system/view/signups/game1/game.js
+++ /dev/null
@@ -1,20 +0,0 @@
-
-/*
-Small hints:
--------------
-
-
-var FAPI = new FAPI();
-
-later add data as they come in:
-FAPI.data.setValue('mehl', 'bla@lala.de');
-
-and send:
-FAPI.submitSignup();
-
-
-place global in a load_game() function (or so) and call it in game1/index.php as already implemented there.
-
-to avoid broken paths, use as follows:
-d3.xml(FAPI.resolvePath('graphics/map_castle.svg'), 'image/svg+xml', function (xml) {
-*/
\ No newline at end of file
diff --git a/registration-system/view/signups/game1/js/achievements.js b/registration-system/view/signups/game1/js/achievements.js
index 575641d9bd793cbccb8f48165b7c226917fed832..9251f1d2534f6fdedc14b7b9319d44958eb77572 100644
--- a/registration-system/view/signups/game1/js/achievements.js
+++ b/registration-system/view/signups/game1/js/achievements.js
@@ -55,7 +55,7 @@ Achievements.prototype.updateStatusText = function () {
 };
 
 Achievements.prototype.logMessage = function (message) {
-    if (Environment.sound.achievements) new Audio(FAPI.resolvePath('sounds/ding.mp3')).play();
+    if (Environment.sound.achievements) new Audio(FAPI.resolvePath('sounds/ding.ogg')).play();
     var list = this.getDomElem('log');
 
     var newElem = document.createElement('li');
@@ -98,4 +98,4 @@ Achievements.prototype.triggerAchievement = function (achievementId, context) {
     // else console.warn("Achievement already achieved: " + achievementId);
 
     if (this.numCompletedAchievements() === 42 ) this.triggerAchievement('achievement42')
-};
\ No newline at end of file
+};
diff --git a/registration-system/view/signups/game1/js/game.js b/registration-system/view/signups/game1/js/game.js
index 44c96d01c49021c3f3f9711afd9579f3a88f7016..0d1020703a2e51bf44c1f571e254b2fa5d0aeaba 100644
--- a/registration-system/view/signups/game1/js/game.js
+++ b/registration-system/view/signups/game1/js/game.js
@@ -184,7 +184,7 @@ Game.prototype.loadMap = function (map, spawn) {
 };
 
 Game.log = function (message) {
-    if (Environment.sound.log) new Audio(FAPI.resolvePath('sounds/plop.mp3')).play();
+    if (Environment.sound.log) new Audio(FAPI.resolvePath('sounds/plop.ogg')).play();
     var list = document.getElementById('game-log');
 
     var newElem = document.createElement('li');
diff --git a/registration-system/view/signups/game1/sounds/ding.mp3 b/registration-system/view/signups/game1/sounds/ding.mp3
deleted file mode 100644
index 4aa624b3fdaa63854390a5f0ace19cb987461246..0000000000000000000000000000000000000000
Binary files a/registration-system/view/signups/game1/sounds/ding.mp3 and /dev/null differ
diff --git a/registration-system/view/signups/game1/sounds/ding.ogg b/registration-system/view/signups/game1/sounds/ding.ogg
new file mode 100644
index 0000000000000000000000000000000000000000..4d84dbefe8132c27823ad24aa9add7c4569e37eb
Binary files /dev/null and b/registration-system/view/signups/game1/sounds/ding.ogg differ
diff --git a/registration-system/view/signups/game1/sounds/plop.mp3 b/registration-system/view/signups/game1/sounds/plop.mp3
deleted file mode 100644
index 28a62449d56d8122521f016b9cdb8e2d445a3cb0..0000000000000000000000000000000000000000
Binary files a/registration-system/view/signups/game1/sounds/plop.mp3 and /dev/null differ
diff --git a/registration-system/view/signups/game1/sounds/plop.ogg b/registration-system/view/signups/game1/sounds/plop.ogg
new file mode 100644
index 0000000000000000000000000000000000000000..464493b91fe354f528dfed14faba2b7349b8b225
Binary files /dev/null and b/registration-system/view/signups/game1/sounds/plop.ogg differ