diff --git a/src/main/java/fr/ynerant/leveleditor/game/GameFrame.java b/src/main/java/fr/ynerant/leveleditor/game/GameFrame.java
index 6bdcf5b..70e8fe2 100644
--- a/src/main/java/fr/ynerant/leveleditor/game/GameFrame.java
+++ b/src/main/java/fr/ynerant/leveleditor/game/GameFrame.java
@@ -66,15 +66,20 @@ public class GameFrame extends JFrame implements WindowListener {
             if (mobs.isEmpty() && round < 4) {
                 ++round;
                 for (int i = 1; i <= RANDOM.nextInt(16) + 1; ++i) {
-                    Mob mob = new Mob();
+                    Mob mob = Mob.getRandomMob();
                     mob.move(RANDOM.nextInt(getMap().getWidth() / 16), RANDOM.nextInt(getMap().getHeight() / 16));
                     mobs.add(mob);
                 }
             }
 
-            for (Mob mob : mobs) {
-                Sprite s = mob.getSprite();
-                g.drawImage(s.getImage(), SPRITE_SIZE * mob.getX(), SPRITE_SIZE * mob.getY(), SPRITE_SIZE, SPRITE_SIZE, null, null);
+            for (Mob mob : new ArrayList<>(mobs)) {
+                mob.tick();
+                if (mob.getX() < 0 || mob.isDead())
+                    mobs.remove(mob);
+                else {
+                    Sprite s = mob.getSprite();
+                    g.drawImage(s.getImage(), SPRITE_SIZE * mob.getX(), SPRITE_SIZE * mob.getY(), SPRITE_SIZE, SPRITE_SIZE, null, null);
+                }
             }
 
             repaint();
diff --git a/src/main/java/fr/ynerant/leveleditor/game/Mob.java b/src/main/java/fr/ynerant/leveleditor/game/Mob.java
index 1249ac7..b201ca5 100644
--- a/src/main/java/fr/ynerant/leveleditor/game/Mob.java
+++ b/src/main/java/fr/ynerant/leveleditor/game/Mob.java
@@ -7,18 +7,30 @@ import java.util.Arrays;
 import java.util.List;
 import java.util.Random;
 
-public class Mob {
+public abstract class Mob {
     private static final Random RANDOM = new Random();
-    private static final List<String> MOB_SPRITES = Arrays.asList("mob1", "mob2", "mobcancer");
     private Sprite sprite;
     private int x;
     private int y;
+    private int hp;
+    private long tickRemains;
 
     public Mob() {
-        this.sprite = SpriteRegister.getCategory(MOB_SPRITES.get(RANDOM.nextInt(3))).getSprites().get(0);
+        this.hp = getMaxHP();
+        this.tickRemains = getSlowness();
     }
 
+    public abstract int getMaxHP();
+
+    public abstract long getSlowness();
+
+    public abstract int getReward();
+
+    public abstract String getName();
+
     public Sprite getSprite() {
+        if (sprite == null)
+            sprite = SpriteRegister.getCategory(getName()).getSprites().get(0);
         return sprite;
     }
 
@@ -35,6 +47,36 @@ public class Mob {
         this.y = y;
     }
 
+    public int getHP() {
+        return hp;
+    }
+
+    public boolean isDead() {
+        return hp <= 0;
+    }
+
+    public void setHP(int hp) {
+        this.hp = hp;
+    }
+
+    public boolean hit() {
+        if (!isDead()) {
+            --this.hp;
+            return true;
+        }
+
+        return false;
+    }
+
+    public void tick() {
+        if (tickRemains > 0)
+            --tickRemains;
+        else {
+            tickRemains = getSlowness();
+            move(getX() - 1, getY());
+        }
+    }
+
     @Override
     public String toString() {
         return "Mob{" +
@@ -43,4 +85,15 @@ public class Mob {
                 ", y=" + y +
                 '}';
     }
+
+    public static Mob getRandomMob() {
+        switch (RANDOM.nextInt(3)) {
+            case 1:
+                return new Mob1();
+            case 2:
+                return new Mob2();
+            default:
+                return new MobCancer();
+        }
+    }
 }
diff --git a/src/main/java/fr/ynerant/leveleditor/game/Mob1.java b/src/main/java/fr/ynerant/leveleditor/game/Mob1.java
new file mode 100644
index 0000000..2a6fe6d
--- /dev/null
+++ b/src/main/java/fr/ynerant/leveleditor/game/Mob1.java
@@ -0,0 +1,23 @@
+package fr.ynerant.leveleditor.game;
+
+public class Mob1 extends Mob {
+    @Override
+    public int getMaxHP() {
+        return 2;
+    }
+
+    @Override
+    public long getSlowness() {
+        return 100;
+    }
+
+    @Override
+    public int getReward() {
+        return 10;
+    }
+
+    @Override
+    public String getName() {
+        return "mob1";
+    }
+}
diff --git a/src/main/java/fr/ynerant/leveleditor/game/Mob2.java b/src/main/java/fr/ynerant/leveleditor/game/Mob2.java
new file mode 100644
index 0000000..593213e
--- /dev/null
+++ b/src/main/java/fr/ynerant/leveleditor/game/Mob2.java
@@ -0,0 +1,23 @@
+package fr.ynerant.leveleditor.game;
+
+public class Mob2 extends Mob {
+    @Override
+    public int getMaxHP() {
+        return 6;
+    }
+
+    @Override
+    public long getSlowness() {
+        return 60;
+    }
+
+    @Override
+    public int getReward() {
+        return 20;
+    }
+
+    @Override
+    public String getName() {
+        return "mob2";
+    }
+}
diff --git a/src/main/java/fr/ynerant/leveleditor/game/MobCancer.java b/src/main/java/fr/ynerant/leveleditor/game/MobCancer.java
new file mode 100644
index 0000000..8164ec8
--- /dev/null
+++ b/src/main/java/fr/ynerant/leveleditor/game/MobCancer.java
@@ -0,0 +1,23 @@
+package fr.ynerant.leveleditor.game;
+
+public class MobCancer extends Mob {
+    @Override
+    public int getMaxHP() {
+        return 50;
+    }
+
+    @Override
+    public long getSlowness() {
+        return 10000;
+    }
+
+    @Override
+    public int getReward() {
+        return 100;
+    }
+
+    @Override
+    public String getName() {
+        return "mobcancer";
+    }
+}