diff --git a/app.c b/app.c
index 822fd62..7aaff88 100644
--- a/app.c
+++ b/app.c
@@ -248,9 +248,9 @@ int collision(v2 point, int x, int y, int w, int h)
             point.y >= y && point.y < y + h);
 }
 
-void init()
+void set_default_map()
 {
-    pengers_init();
+    nb_collisions = 0;
     collisions[nb_collisions++] = (Collision) {
         .x = 100,
         .y = 400,
@@ -283,6 +283,12 @@ void init()
     };
 }
 
+void init()
+{
+    pengers_init();
+    set_default_map();
+}
+
 void draw(float dt)
 {
     int scale = get_scale();
diff --git a/build.sh b/build.sh
index 53df774..76e3f98 100755
--- a/build.sh
+++ b/build.sh
@@ -5,7 +5,7 @@ if [[ "$1" == "clear" ]]; then
     exit
 fi;
 
-export_sym="init draw key_pressed key_released set_velocity set_mouse get_pos_x get_pos_y draw_player deco_player reset_collisions add_collisions BUFFER width height id nb_players dir"
+export_sym="init draw key_pressed key_released set_velocity set_mouse get_pos_x get_pos_y draw_player deco_player reset_collisions add_collisions set_default_map BUFFER width height id nb_players dir"
 export_cmd=""
 for e in $export_sym; do
     export_cmd="$export_cmd -Wl,--export=$e";
diff --git a/index.html.template b/index.html.template
index c1ca7ce..0677516 100644
--- a/index.html.template
+++ b/index.html.template
@@ -58,6 +58,8 @@
                 </p>
                 <p>Players:</p>
                 <ul id="players">Not connected</ul>
+                <p>Playing map : <span id="map-name">Default Map</span></p>
+                <p>Next map in : <span id="map-time">-1</span></p>
                 <h3>Choose your penger:</h3>
             </div>
         </div>
diff --git a/load.js b/load.js
index ad9d2a4..90c8467 100644
--- a/load.js
+++ b/load.js
@@ -27,6 +27,9 @@ window.onload = () => {
             is_connected = false;
             wasm_set_variable('nb_players', 0);
             document.getElementById('players').innerHTML = "Not connected";
+            document.getElementById('map-name').innerText = "Default Map";
+            document.getElementById('map-time').innerText = "-1";
+            wasm_function("set_default_map")();
         }
         connection.send('{"name": "pseudo", "value": "'+pseudo+'"}');
     };
@@ -74,6 +77,20 @@ connection.onmessage = (e) => {
             wasm_function('draw_player')(player.rid, player.id, player.x, player.y, player.dir);
         }
     }
+    else if (req.name == "map") {
+        var map = req.value;
+        document.getElementById("map-name").innerText = map.name;
+        console.log(Date.now(), " -> ", map.next_at);
+        wasm_function('reset_collisions')();
+        for (var i = 0; i < map.collisions.length; i++) {
+            wasm_function('add_collisions')(
+                map.collisions[i].x,
+                map.collisions[i].y,
+                map.collisions[i].width,
+                map.collisions[i].height
+            );
+        }
+    }
     else if (req.name == "disconnect") {
         wasm_function('deco_player')(req.value);
     }
diff --git a/maps.json b/maps.json
new file mode 100644
index 0000000..a99dc97
--- /dev/null
+++ b/maps.json
@@ -0,0 +1,30 @@
+[
+    {
+        "name": "test1",
+        "collisions": [
+            {
+                "x": 0,
+                "y": 0,
+                "width": 100, "height": 100
+            },
+            {
+                "x": 50, "y": 400,
+                "width": 100, "height": 50
+            }
+        ]
+    },
+    {
+        "name": "test2",
+        "collisions": [
+            {
+                "x": 50,
+                "y": 50,
+                "width": 10, "height": 7
+            },
+            {
+                "x": 400, "y": 50,
+                "width": 5, "height": 350
+            }
+        ]
+    }
+]
diff --git a/server.js b/server.js
index 04197eb..2542bb6 100644
--- a/server.js
+++ b/server.js
@@ -34,6 +34,25 @@ function update_player_pos()
 }
 setTimeout(update_player_pos, update_time_ms);
 
+var current_map = 0;
+// var map_every_ms = 60 * 1000;
+var map_every_ms = 4 * 1000;
+function send_new_map()
+{
+    var map = maps[Math.floor(Math.random() * maps.length)];
+    map.next_at = Date.now() + map_every_ms;
+    sockets.forEach((s) => {
+        if (s.game.pseudo == undefined || s.game.pseudo == "") return;
+        s.send('{"name": "map", "value": '+JSON.stringify(map)+'}');
+    });
+    setTimeout(send_new_map, map_every_ms);
+}
+setTimeout(send_new_map, map_every_ms);
+function send_map(socket)
+{
+    socket.send('{"name": "map", "value": '+JSON.stringify(maps[current_map])+'}'); 
+}
+
 const requestListener = function (req, res) {
     var url = req.url;
 
@@ -75,6 +94,8 @@ http_server.listen(HTTP_PORT, () => {
     console.log(`Server is running on port ${HTTP_PORT}`);
 });
 
+var maps = JSON.parse(fs.readFileSync("maps.json"));
+
 const ws_server = new ws.Server({ port: WS_PORT });
 
 var global_id = 0;
@@ -83,7 +104,9 @@ var sockets = [];
 ws_server.on('connection', (socket) => {
     socket.game = {};
     socket.game.rid = global_id++;
+
     socket.send('{"name": "rid", "value": '+socket.game.rid+'}');
+
     sockets.push(socket);
     console.log("connect: ", sockets.length);
 
@@ -91,6 +114,7 @@ ws_server.on('connection', (socket) => {
         var msg_str = Buffer.from(msg).toString('latin1');
         var req = JSON.parse(msg_str);
         if (req.name == "pseudo") {
+            if (socket.game.pseudo == undefined || socket.game.pseudo == "" && req.value != "") send_map(socket);
             socket.game.pseudo = req.value;
             if (req.value == "") sockets.forEach((s) => { s.send('{"name": "disconnect", "value": '+socket.game.rid+'}') });
             update_player_list();