diff --git a/src/main/java/fr/ynerant/leveleditor/game/BasicTower.java b/src/main/java/fr/ynerant/leveleditor/game/BasicTower.java
new file mode 100644
index 0000000..3ce72bc
--- /dev/null
+++ b/src/main/java/fr/ynerant/leveleditor/game/BasicTower.java
@@ -0,0 +1,38 @@
+package fr.ynerant.leveleditor.game;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+public class BasicTower extends Tower {
+    public BasicTower(int x, int y) {
+        super(x, y);
+    }
+
+    @Override
+    public int getDamagePerShot() {
+        return 1;
+    }
+
+    @Override
+    public long getPeriod() {
+        return 5;
+    }
+
+    @Override
+    public int getPrice() {
+        return 10;
+    }
+
+    @Override
+    Collection<Mob> _filterDetectedMobs(Collection<Mob> mobs) {
+        List<Mob> filtered = new ArrayList<>();
+
+        for (Mob mob : mobs) {
+            if (mob.getX() == getX() || mob.getY() == getY())
+                filtered.add(mob);
+        }
+
+        return filtered;
+    }
+}
diff --git a/src/main/java/fr/ynerant/leveleditor/game/GameFrame.java b/src/main/java/fr/ynerant/leveleditor/game/GameFrame.java
index 70e8fe2..cbca5b4 100644
--- a/src/main/java/fr/ynerant/leveleditor/game/GameFrame.java
+++ b/src/main/java/fr/ynerant/leveleditor/game/GameFrame.java
@@ -19,7 +19,10 @@ public class GameFrame extends JFrame implements WindowListener {
     private final RawMap map;
 
     private int round = 0;
+    private int hp = 20;
+    private int reward = 20;
     private List<Mob> mobs = new ArrayList<>();
+    private List<Tower> towers = new ArrayList<>();
 
     public GameFrame(RawMap map) {
         super("Jeu");
@@ -72,10 +75,20 @@ public class GameFrame extends JFrame implements WindowListener {
                 }
             }
 
+            for (Tower tower : towers) {
+                for (Mob mob : tower.filterDetectedMobs(mobs))
+                    mob.hit();
+            }
+
             for (Mob mob : new ArrayList<>(mobs)) {
                 mob.tick();
-                if (mob.getX() < 0 || mob.isDead())
+                if (mob.getX() < 0 || mob.isDead()) {
                     mobs.remove(mob);
+                    if (mob.getX() < 0)
+                        --hp;
+                    else
+                        reward += mob.getReward();
+                }
                 else {
                     Sprite s = mob.getSprite();
                     g.drawImage(s.getImage(), SPRITE_SIZE * mob.getX(), SPRITE_SIZE * mob.getY(), SPRITE_SIZE, SPRITE_SIZE, null, null);
diff --git a/src/main/java/fr/ynerant/leveleditor/game/Mob.java b/src/main/java/fr/ynerant/leveleditor/game/Mob.java
index b201ca5..89412a0 100644
--- a/src/main/java/fr/ynerant/leveleditor/game/Mob.java
+++ b/src/main/java/fr/ynerant/leveleditor/game/Mob.java
@@ -3,8 +3,6 @@ package fr.ynerant.leveleditor.game;
 import fr.ynerant.leveleditor.api.editor.sprites.Sprite;
 import fr.ynerant.leveleditor.api.editor.sprites.SpriteRegister;
 
-import java.util.Arrays;
-import java.util.List;
 import java.util.Random;
 
 public abstract class Mob {
diff --git a/src/main/java/fr/ynerant/leveleditor/game/NullTower.java b/src/main/java/fr/ynerant/leveleditor/game/NullTower.java
new file mode 100644
index 0000000..3ea628e
--- /dev/null
+++ b/src/main/java/fr/ynerant/leveleditor/game/NullTower.java
@@ -0,0 +1,30 @@
+package fr.ynerant.leveleditor.game;
+
+import java.util.ArrayList;
+import java.util.Collection;
+
+public class NullTower extends Tower {
+    public NullTower(int x, int y) {
+        super(x, y);
+    }
+
+    @Override
+    public int getDamagePerShot() {
+        return Integer.MAX_VALUE;
+    }
+
+    @Override
+    public long getPeriod() {
+        return 1;
+    }
+
+    @Override
+    public int getPrice() {
+        return 0;
+    }
+
+    @Override
+    Collection<Mob> _filterDetectedMobs(Collection<Mob> mobs) {
+        return new ArrayList<>();
+    }
+}
diff --git a/src/main/java/fr/ynerant/leveleditor/game/SuperTower.java b/src/main/java/fr/ynerant/leveleditor/game/SuperTower.java
new file mode 100644
index 0000000..bd48827
--- /dev/null
+++ b/src/main/java/fr/ynerant/leveleditor/game/SuperTower.java
@@ -0,0 +1,29 @@
+package fr.ynerant.leveleditor.game;
+
+import java.util.Collection;
+
+public class SuperTower extends Tower {
+    public SuperTower(int x, int y) {
+        super(x, y);
+    }
+
+    @Override
+    public int getDamagePerShot() {
+        return 20;
+    }
+
+    @Override
+    public long getPeriod() {
+        return 10;
+    }
+
+    @Override
+    public int getPrice() {
+        return 142;
+    }
+
+    @Override
+    Collection<Mob> _filterDetectedMobs(Collection<Mob> mobs) {
+        return mobs;
+    }
+}
diff --git a/src/main/java/fr/ynerant/leveleditor/game/Tower.java b/src/main/java/fr/ynerant/leveleditor/game/Tower.java
new file mode 100644
index 0000000..295e5c9
--- /dev/null
+++ b/src/main/java/fr/ynerant/leveleditor/game/Tower.java
@@ -0,0 +1,45 @@
+package fr.ynerant.leveleditor.game;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Random;
+
+public abstract class Tower {
+    private final int x;
+    private final int y;
+    private long remainingTicks;
+
+    public Tower(int x, int y) {
+        this.x = x;
+        this.y = y;
+    }
+
+    private static final Random RANDOM = new Random();
+
+    public abstract int getDamagePerShot();
+
+    public abstract long getPeriod();
+
+    public abstract int getPrice();
+
+    abstract Collection<Mob> _filterDetectedMobs(Collection<Mob> mobs);
+
+    public Collection<Mob> filterDetectedMobs(Collection<Mob> mobs) {
+        if (remainingTicks > 0) {
+            --remainingTicks;
+            return new ArrayList<>();
+        }
+        else {
+            remainingTicks = getPeriod();
+            return filterDetectedMobs(mobs);
+        }
+    }
+
+    public int getX() {
+        return x;
+    }
+
+    public int getY() {
+        return y;
+    }
+}