diff --git a/client/src/main/java/fr/lnl/game/client/view/GUI.java b/client/src/main/java/fr/lnl/game/client/view/GUI.java
index 175918f..09b4b51 100644
--- a/client/src/main/java/fr/lnl/game/client/view/GUI.java
+++ b/client/src/main/java/fr/lnl/game/client/view/GUI.java
@@ -101,9 +101,7 @@ public class GUI {
         List<Player> players = Arrays.asList(new RandomComputerPlayer(1, null, ClassPlayer.DEFAULT),
                 new RandomComputerPlayer(2, null, ClassPlayer.DEFAULT));
         Grid grid =  new Grid(16, 16, players);
-        grid.placePlayersBRUT();
-        grid.placeEnergyBallBRUT();
-        grid.placeInternWallBRUT();
+        //grid.placePlayersBRUT();
         return grid;
     }
 
diff --git a/server/src/main/java/fr/lnl/game/server/games/grid/AbstractBox.java b/server/src/main/java/fr/lnl/game/server/games/grid/AbstractBox.java
new file mode 100644
index 0000000..ebf58ee
--- /dev/null
+++ b/server/src/main/java/fr/lnl/game/server/games/grid/AbstractBox.java
@@ -0,0 +1,21 @@
+package fr.lnl.game.server.games.grid;
+
+public class AbstractBox implements Box{
+
+    boolean lock;
+
+    public AbstractBox(){
+        lock = false;
+    }
+
+    @Override
+    public void setLock(boolean lock) {
+        this.lock = lock;
+    }
+
+    @Override
+    public boolean isLock() {
+        return lock;
+    }
+}
+
diff --git a/server/src/main/java/fr/lnl/game/server/games/grid/Box.java b/server/src/main/java/fr/lnl/game/server/games/grid/Box.java
index 593512e..1a7186f 100644
--- a/server/src/main/java/fr/lnl/game/server/games/grid/Box.java
+++ b/server/src/main/java/fr/lnl/game/server/games/grid/Box.java
@@ -1,4 +1,7 @@
 package fr.lnl.game.server.games.grid;
 
 public interface Box {
+
+    boolean isLock();
+    void setLock(boolean lock);
 }
diff --git a/server/src/main/java/fr/lnl/game/server/games/grid/EnergyBall.java b/server/src/main/java/fr/lnl/game/server/games/grid/EnergyBall.java
index 1fd9193..88e9ce3 100644
--- a/server/src/main/java/fr/lnl/game/server/games/grid/EnergyBall.java
+++ b/server/src/main/java/fr/lnl/game/server/games/grid/EnergyBall.java
@@ -3,7 +3,7 @@ package fr.lnl.game.server.games.grid;
 import fr.lnl.game.server.games.player.Player;
 import fr.lnl.game.server.utils.Point;
 
-public class EnergyBall implements Box, InteractiveBox {
+public class EnergyBall extends AbstractBox implements InteractiveBox{
 
     @Override
     public boolean equals(Object o) {
diff --git a/server/src/main/java/fr/lnl/game/server/games/grid/Explosive.java b/server/src/main/java/fr/lnl/game/server/games/grid/Explosive.java
index 8861a4b..e4c6321 100644
--- a/server/src/main/java/fr/lnl/game/server/games/grid/Explosive.java
+++ b/server/src/main/java/fr/lnl/game/server/games/grid/Explosive.java
@@ -3,7 +3,7 @@ package fr.lnl.game.server.games.grid;
 import fr.lnl.game.server.games.player.Player;
 import fr.lnl.game.server.utils.Point;
 
-public abstract class Explosive implements Box, InteractiveBox {
+public abstract class Explosive extends AbstractBox implements InteractiveBox {
 
     @Override
     public void interact(Grid grid, Player player, Point position) {
diff --git a/server/src/main/java/fr/lnl/game/server/games/grid/Wall.java b/server/src/main/java/fr/lnl/game/server/games/grid/Wall.java
index 06d8853..dd52cec 100644
--- a/server/src/main/java/fr/lnl/game/server/games/grid/Wall.java
+++ b/server/src/main/java/fr/lnl/game/server/games/grid/Wall.java
@@ -4,7 +4,7 @@ import fr.lnl.game.server.utils.Cardinal;
 
 import java.util.Objects;
 
-public class Wall implements Box {
+public class Wall extends AbstractBox {
 
     private final Cardinal cardinal;
     private final int x;