diff --git a/server/src/main/java/fr/lnl/game/server/games/grid/build/AbstractBuildStrategy.java b/server/src/main/java/fr/lnl/game/server/games/grid/build/AbstractBuildStrategy.java
new file mode 100644
index 0000000..80b3d05
--- /dev/null
+++ b/server/src/main/java/fr/lnl/game/server/games/grid/build/AbstractBuildStrategy.java
@@ -0,0 +1,42 @@
+package fr.lnl.game.server.games.grid.build;
+
+import fr.lnl.game.server.games.grid.Grid;
+
+public abstract class AbstractBuildStrategy implements BuildStrategy{
+
+    private final float WALL_PROBABILITY, ENERGY_PROBABILITY;
+    private final Grid GRID;
+
+    public AbstractBuildStrategy(Grid grid, float wallProbability, float energyProbability){
+        this.GRID = grid;
+        this.WALL_PROBABILITY = wallProbability;
+        this.ENERGY_PROBABILITY = energyProbability;
+    }
+
+
+    @Override
+    public void build() {
+        initGrid();
+        initPlaceInternWall(WALL_PROBABILITY);
+        initPlaceEnergyBall(ENERGY_PROBABILITY);
+    }
+
+    private float getEnergyProbability() {
+        return ENERGY_PROBABILITY;
+    }
+
+    private float getWallProbability() {
+        return WALL_PROBABILITY;
+    }
+
+    public Grid getGrid() {
+        return GRID;
+    }
+
+    abstract void initGrid();
+    abstract void initPlaceEnergyBall(float probability);
+    abstract void initPlaceInternWall(float probability);
+
+
+
+}
diff --git a/server/src/main/java/fr/lnl/game/server/games/grid/build/BuildStrategy.java b/server/src/main/java/fr/lnl/game/server/games/grid/build/BuildStrategy.java
new file mode 100644
index 0000000..9d0b144
--- /dev/null
+++ b/server/src/main/java/fr/lnl/game/server/games/grid/build/BuildStrategy.java
@@ -0,0 +1,11 @@
+package fr.lnl.game.server.games.grid.build;
+
+import fr.lnl.game.server.games.grid.Grid;
+
+public interface BuildStrategy {
+
+    void build();
+    void initPlacePlayers();
+    Grid getGrid();
+
+}
diff --git a/server/src/main/java/fr/lnl/game/server/games/grid/build/LockStrategy.java b/server/src/main/java/fr/lnl/game/server/games/grid/build/LockStrategy.java
new file mode 100644
index 0000000..98801ca
--- /dev/null
+++ b/server/src/main/java/fr/lnl/game/server/games/grid/build/LockStrategy.java
@@ -0,0 +1,117 @@
+package fr.lnl.game.server.games.grid.build;
+
+import fr.lnl.game.server.games.grid.Grid;
+import fr.lnl.game.server.games.grid.elements.AbstractBox;
+import fr.lnl.game.server.games.grid.elements.Box;
+import fr.lnl.game.server.games.grid.elements.EnergyBall;
+import fr.lnl.game.server.games.grid.elements.Wall;
+import fr.lnl.game.server.games.player.Player;
+import fr.lnl.game.server.utils.Pair;
+import fr.lnl.game.server.utils.Point;
+
+import java.util.Random;
+
+public class LockStrategy extends AbstractBuildStrategy{
+    public LockStrategy(Grid grid, float wallProbability, float energyProbability) {
+        super(grid, wallProbability, energyProbability);
+    }
+
+    @Override
+    void initGrid() {
+        for (int i = 0; i < getGrid().getRow(); i++) {
+            for (int j = 0; j < getGrid().getColumn(); j++) {
+                Box box;
+                if (i == 0 && j == 0) {
+                    box = new Wall(i, j);
+                } else if (i == 0 && j == getGrid().getColumn()-1) {
+                    box = new Wall(i, j);
+                } else if (i == getGrid().getRow()-1 && j == 0) {
+                    box = new Wall(i, j);
+                } else if (i == getGrid().getRow()-1 && j == getGrid().getColumn()-1) {
+                    box = new Wall(i, j);
+                } else if (i == 0) {
+                    box = new Wall(i, j);
+                } else if (i == getGrid().getRow()-1) {
+                    box = new Wall(i, j);
+                } else if (j == 0) {
+                    box = new Wall(i, j);
+                } else if (j == getGrid().getColumn()-1) {
+                    box = new Wall(i, j);
+                } else {
+                    box = null;
+                }
+                getGrid().getBoard().put(new Point(i,j), new Pair<>(null,box));
+            }
+        }
+    }
+
+    @Override
+    void initPlaceEnergyBall(float probability) {
+        for (int i = 1; i < getGrid().getRow() - 1; i++) {
+            for (int j = 1; j < getGrid().getColumn() - 1; j++) {
+                if(Math.random() >= probability){
+                    Point point = new Point(i,j);
+                    if(!(getGrid().getBoard().get(point).getB() instanceof Wall)){
+                        getGrid().getBoard().get(point).setB(new EnergyBall());
+                    }
+                }
+            }
+        }
+    }
+
+    @Override
+    void initPlaceInternWall(float probability) {
+        for (int i = 1; i < getGrid().getRow() - 1; i++) {
+            for (int j = 1; j < getGrid().getColumn() - 1; j++) {
+                if(Math.random() >= probability){
+                    Point point = new Point(i,j);
+                    if(getIllusionNumberWallNeighbour(point) <= 3){
+                        getGrid().getBoard().get(point).setB(new Wall(i,j));
+                    }
+                    else{
+                        getGrid().getBoard().get(point).setB(new AbstractBox());
+                        getGrid().getBoard().get(point).getB().setLock(true);
+                    }
+                }
+            }
+        }
+    }
+
+    @Override
+    public void initPlacePlayers() {
+        Random random = new Random();
+        Box boxTargeted;
+        Player playerTargeted;
+        Point point;
+        for (Player player: getGrid().getPlayers()) {
+            do{
+                int i = random.nextInt(1,getGrid().getRow() - 1);
+                int j = random.nextInt(1,getGrid().getColumn() - 1);
+                point = new Point(i,j);
+                Pair<Player,Box> pairTargeted = getGrid().getBoard().get(point);
+                boxTargeted = pairTargeted.getB();
+                playerTargeted = pairTargeted.getA();
+            }while(playerTargeted != null || !getGrid().isNeutralBox(boxTargeted));
+            getGrid().getBoard().get(point).setA(player);
+            player.setPosition(point);
+        }
+    }
+
+    public int getIllusionNumberWallNeighbour(Point point){
+        int countWall = 0;
+        for (int deltaRow = -1; deltaRow <= 1; deltaRow++){
+            for (int deltaColomn = -1; deltaColomn <= 1; deltaColomn++) {
+                Point neighbour = new Point(point.getA() + deltaRow, point.getB() + deltaColomn);
+                if (getGrid().boardPositionIsValid(neighbour)) {
+                    Box box = getGrid().getBoard().get(neighbour).getB();
+                    if (box != null) {
+                        if (box instanceof Wall || box.isLock()) {
+                            countWall++;
+                        }
+                    }
+                }
+            }
+        }
+        return countWall;
+    }
+}