diff --git a/include/level.hpp b/include/level.hpp
index 0fe1423..c39262b 100644
--- a/include/level.hpp
+++ b/include/level.hpp
@@ -163,9 +163,11 @@ public:
     const std::vector<Player::Ptr>& getPlayers() const;
 
     /**
-     * Ajoute un nouvel objet
+     * Ajoute un nouvel objet. Retourne l'objet
+     * si il a bien été ajouté, ou nullptr si l'ajout
+     * a été bloqué
      */
-    void addObject(Object::Ptr object);
+    Object::Ptr addObject(Object::Ptr object);
 
     /**
      * Supprime l'objet donné
diff --git a/src/block.cpp b/src/block.cpp
index f167b2e..98d6af8 100644
--- a/src/block.cpp
+++ b/src/block.cpp
@@ -7,10 +7,6 @@
 const unsigned int Block::TYPE_ID = 2;
 
 Block::Block() : Object() {
-    // par défaut, les blocs ne sont pas déplaçables et ont
-    // donc une masse infinie, représentée par 0
-    setMass(0.f);
-
     // déplacement de l'origine au centre du bloc
     sprite.setOrigin(sf::Vector2f(23, 23));
     select_sprite.setOrigin(sf::Vector2f(23, 23));
diff --git a/src/game.cpp b/src/game.cpp
index 95e20fc..c302c42 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -1,5 +1,4 @@
 #include <cmath>
-#include <iostream>
 #include "game.hpp"
 #include "player.hpp"
 #include "constants.hpp"
diff --git a/src/manager.cpp b/src/manager.cpp
index 05ddb5e..cb5900e 100644
--- a/src/manager.cpp
+++ b/src/manager.cpp
@@ -1,4 +1,3 @@
-#include <iostream>
 #include "manager.hpp"
 
 const unsigned int Manager::FPS = 60;
diff --git a/src/object.cpp b/src/object.cpp
index 8c44d45..8077e6b 100644
--- a/src/object.cpp
+++ b/src/object.cpp
@@ -2,11 +2,10 @@
 #include "level.hpp"
 #include "constants.hpp"
 #include "collision.hpp"
-#include <iostream>
 #include <cmath>
 
 const unsigned int Object::PROP_MASS = 1;
-const float DEFAULT_MASS = 1.f;
+const float DEFAULT_MASS = 0.f;
 const unsigned int Object::PROP_CHARGE = 2;
 const float DEFAULT_CHARGE = 0.f;
 const unsigned int Object::PROP_RESTITUTION = 3;
@@ -338,9 +337,6 @@ float Object::getMassInvert() const {
 }
 
 void Object::setMass(float set_mass) {
-    if (getTypeId() == 1){
-        std::cout << "Change mass player from " << mass << " to " << set_mass << std::endl;
-    }
     mass = set_mass;
     inv_mass = -1.f;
 }
diff --git a/src/widget_toolbar.cpp b/src/widget_toolbar.cpp
index 59162f7..7e69c91 100644
--- a/src/widget_toolbar.cpp
+++ b/src/widget_toolbar.cpp
@@ -37,7 +37,9 @@ Object::Ptr WidgetToolbar::createMovableBlock() {
 }
 
 Object::Ptr WidgetToolbar::createPlayer() {
-    return Object::Ptr(new Player);
+    Object::Ptr player = Object::Ptr(new Player);
+    player->setMass(1.f);
+    return player;
 }
 
 Object::Ptr WidgetToolbar::createGravityBlock(GravityDirection direction) {