diff --git a/include/game/Towers.h b/include/game/Towers.h
index 3671e6d..56eb6ac 100644
--- a/include/game/Towers.h
+++ b/include/game/Towers.h
@@ -10,6 +10,11 @@
 namespace td {
 namespace game {
 
+class World;
+class Mob;
+
+typedef std::shared_ptr<Mob> MobPtr;
+
 enum class TowerType : std::uint8_t {
     Archer = 0,
     Ice,
@@ -88,19 +93,21 @@ private:
     PlayerID m_Builder;
 protected:
     utils::Timer m_Timer;
-public:                                                                 // converting seconds to millis
+public:                                                                 
     Tower(TowerID id, TowerType type, std::uint16_t x, std::uint16_t y, PlayerID builder) : m_ID(id), m_Type(type), m_X(x), m_Y(y), m_Builder(builder),
-        m_Timer(getStats()->getDamageRate()) {
+        m_Timer(getStats()->getDamageRate() * 1000) { // converting seconds to millis
 
     }
 
     virtual TowerType getType() const = 0;
     virtual TowerSize getSize() const = 0;
-    virtual void tick(std::uint64_t delta) = 0;
+    virtual void tick(std::uint64_t delta, World* world) = 0;
 
     void upgrade(std::uint8_t level, TowerPath path) {
         m_Level.setLevel(level);
         m_Level.setPath(path);
+        m_Timer.setInterval(getStats()->getDamageRate() * 1000); // converting seconds to millis
+        m_Timer.reset();
     }
 
     std::uint16_t getID() const { return m_ID; }
@@ -109,6 +116,7 @@ public:                                                                 // conve
     const TowerLevel& getLevel() const { return m_Level; }
     const TowerStats* getStats() const { return getTowerStats(m_Type, m_Level); }
 
+    bool isMobInRange(MobPtr mob);
 };
 
 typedef std::shared_ptr<Tower> TowerPtr;
@@ -145,7 +153,7 @@ public:
     virtual TowerSize getSize() const { return TowerSize::Little; }
 
     virtual TowerType getType() const = 0;
-    virtual void tick(std::uint64_t delta) = 0;
+    virtual void tick(std::uint64_t delta, World* world) = 0;
 };
 
 class ArcherTower : public LittleTower {
@@ -153,7 +161,9 @@ public:
     ArcherTower(TowerID id, std::uint16_t x, std::uint16_t y, PlayerID builder) : LittleTower(id, getType(), x, y, builder) {}
 
     virtual TowerType getType() const { return TowerType::Archer; }
-    virtual void tick(std::uint64_t delta);
+    virtual void tick(std::uint64_t delta, World* world);
+private:
+    void shootArrow(MobPtr target);
 };
 
 class IceTower : public LittleTower {
@@ -161,7 +171,7 @@ public:
     IceTower(TowerID id, std::uint16_t x, std::uint16_t y, PlayerID builder) : LittleTower(id, getType(), x, y, builder) {}
 
     virtual TowerType getType() const { return TowerType::Ice; }
-    virtual void tick(std::uint64_t delta);
+    virtual void tick(std::uint64_t delta, World* world);
 };
 
 class MageTower : public LittleTower {
@@ -169,7 +179,7 @@ public:
     MageTower(TowerID id, std::uint16_t x, std::uint16_t y, PlayerID builder) : LittleTower(id, getType(), x, y, builder) {}
 
     virtual TowerType getType() const { return TowerType::Mage; }
-    virtual void tick(std::uint64_t delta);
+    virtual void tick(std::uint64_t delta, World* world);
 };
 
 class PoisonTower : public LittleTower {
@@ -177,7 +187,7 @@ public:
     PoisonTower(TowerID id, std::uint16_t x, std::uint16_t y, PlayerID builder) : LittleTower(id, getType(), x, y, builder) {}
 
     virtual TowerType getType() const { return TowerType::Poison; }
-    virtual void tick(std::uint64_t delta);
+    virtual void tick(std::uint64_t delta, World* world);
 };
 
 class QuakeTower : public LittleTower {
@@ -185,7 +195,7 @@ public:
     QuakeTower(TowerID id, std::uint16_t x, std::uint16_t y, PlayerID builder) : LittleTower(id, getType(), x, y, builder) {}
 
     virtual TowerType getType() const { return TowerType::Quake; }
-    virtual void tick(std::uint64_t delta);
+    virtual void tick(std::uint64_t delta, World* world);
 };
 
 class ArtilleryTower : public LittleTower {
@@ -193,7 +203,7 @@ public:
     ArtilleryTower(TowerID id, std::uint16_t x, std::uint16_t y, PlayerID builder) : LittleTower(id, getType(), x, y, builder) {}
 
     virtual TowerType getType() const { return TowerType::Artillery; }
-    virtual void tick(std::uint64_t delta);
+    virtual void tick(std::uint64_t delta, World* world);
 };
 
 class SorcererTower : public LittleTower {
@@ -201,7 +211,7 @@ public:
     SorcererTower(TowerID id, std::uint16_t x, std::uint16_t y, PlayerID builder) : LittleTower(id, getType(), x, y, builder) {}
 
     virtual TowerType getType() const { return TowerType::Sorcerer; }
-    virtual void tick(std::uint64_t delta);
+    virtual void tick(std::uint64_t delta, World* world);
 };
 
 class ZeusTower : public LittleTower {
@@ -209,7 +219,7 @@ public:
     ZeusTower(TowerID id, std::uint16_t x, std::uint16_t y, PlayerID builder) : LittleTower(id, getType(), x, y, builder) {}
 
     virtual TowerType getType() const { return TowerType::Zeus; }
-    virtual void tick(std::uint64_t delta);
+    virtual void tick(std::uint64_t delta, World* world);
 };
 
 // ---------- Big Towers ----------
@@ -221,7 +231,7 @@ public:
     virtual TowerSize getSize() const { return TowerSize::Big; }
 
     virtual TowerType getType() const = 0;
-    virtual void tick(std::uint64_t delta) = 0;
+    virtual void tick(std::uint64_t delta, World* world) = 0;
 };
 
 class TurretTower : public BigTower {
@@ -229,7 +239,7 @@ public:
     TurretTower(TowerID id, std::uint16_t x, std::uint16_t y, PlayerID builder) : BigTower(id, getType(), x, y, builder) {}
 
     virtual TowerType getType() const { return TowerType::Turret; }
-    virtual void tick(std::uint64_t delta);
+    virtual void tick(std::uint64_t delta, World* world);
 };
 
 class NecromancerTower : public BigTower {
@@ -237,7 +247,7 @@ public:
     NecromancerTower(TowerID id, std::uint16_t x, std::uint16_t y, PlayerID builder) : BigTower(id, getType(), x, y, builder) {}
 
     virtual TowerType getType() const { return TowerType::Necromancer; }
-    virtual void tick(std::uint64_t delta);
+    virtual void tick(std::uint64_t delta, World* world);
 };
 
 class LeachTower : public BigTower {
@@ -245,7 +255,7 @@ public:
     LeachTower(TowerID id, std::uint16_t x, std::uint16_t y, PlayerID builder) : BigTower(id, getType(), x, y, builder) {}
 
     virtual TowerType getType() const { return TowerType::Leach; }
-    virtual void tick(std::uint64_t delta);
+    virtual void tick(std::uint64_t delta, World* world);
 };
 
 } // namespace game
diff --git a/include/game/World.h b/include/game/World.h
index 5961e63..9addafc 100644
--- a/include/game/World.h
+++ b/include/game/World.h
@@ -184,6 +184,7 @@ public:
     const TowerList& getTowers() const { return m_Towers; };
 private:
     void moveMobs(std::uint64_t delta);
+    void cleanDeadMobs();
 };
 
 } // namespace game
diff --git a/include/game/server/Lobby.h b/include/game/server/Lobby.h
index eab34e6..9ccd13a 100644
--- a/include/game/server/Lobby.h
+++ b/include/game/server/Lobby.h
@@ -15,7 +15,7 @@ private:
     bool m_GameStarted = false;
     std::uint64_t m_StartTimerTime = 0;
     std::vector<std::uint8_t> m_Players;
-    utils::Timer m_Timer;
+    utils::AutoTimer m_Timer;
 public:
     Lobby(Server* server);
 
diff --git a/include/game/server/ServerGame.h b/include/game/server/ServerGame.h
index 8604c15..a573703 100644
--- a/include/game/server/ServerGame.h
+++ b/include/game/server/ServerGame.h
@@ -13,7 +13,7 @@ class ServerGame : public game::Game {
 private:
     Server* m_Server;
     ServerWorld m_ServerWorld;
-    utils::Timer m_GoldMineTimer{ 1000, std::bind(&ServerGame::updateGoldMines, this) };
+    utils::AutoTimer m_GoldMineTimer{ 1000, std::bind(&ServerGame::updateGoldMines, this) };
 public:
     ServerGame(Server* server);
     ~ServerGame() {}
diff --git a/include/misc/Time.h b/include/misc/Time.h
index 8c02c0c..55bbefa 100644
--- a/include/misc/Time.h
+++ b/include/misc/Time.h
@@ -12,7 +12,7 @@ std::uint64_t getTime();
 typedef std::function<void()> TimerExecFunction;
 
 // utililty class to call function at regular period of time
-class Timer {
+class AutoTimer {
 private:
     std::uint64_t m_Interval;
     TimerExecFunction m_Function;
@@ -20,9 +20,9 @@ private:
     std::uint64_t m_LastTime = getTime();
     std::uint64_t m_InternalTime = 0;
 public:
-    Timer() : m_Interval(0), m_Function(nullptr) {}
-    Timer(std::uint64_t interval) : m_Interval(interval), m_Function(nullptr) {}
-    Timer(std::uint64_t interval, TimerExecFunction callback) : m_Interval(interval), m_Function(callback) {}
+    AutoTimer() : m_Interval(0), m_Function(nullptr) {}
+    AutoTimer(std::uint64_t interval) : m_Interval(interval), m_Function(nullptr) {}
+    AutoTimer(std::uint64_t interval, TimerExecFunction callback) : m_Interval(interval), m_Function(callback) {}
 
     void update();
     void update(std::uint64_t delta);
@@ -36,6 +36,23 @@ public:
     TimerExecFunction getCallbackFunction() const { return m_Function; }
 };
 
+// utililty class to call function at regular period of time
+class Timer {
+private:
+    std::uint64_t m_Interval;
+
+    std::uint64_t m_InternalTime = 0;
+public:
+    Timer() : m_Interval(0) {}
+    Timer(std::uint64_t interval) : m_Interval(interval) {}
+
+    bool update(std::uint64_t delta);
+
+    void reset();
+
+    void setInterval(std::uint64_t newInterval) { m_Interval = newInterval; }
+    std::uint64_t getInterval() const { return m_Interval; }
+};
 
 } // namespace utils
 } // namespace td
diff --git a/src/game/Towers.cpp b/src/game/Towers.cpp
index ad5136e..f661a64 100644
--- a/src/game/Towers.cpp
+++ b/src/game/Towers.cpp
@@ -6,6 +6,12 @@
 namespace td {
 namespace game {
 
+bool Tower::isMobInRange(MobPtr mob) {
+    if(!mob->isAlive())
+        return false;
+    return (m_X - mob->getX()) * (m_X - mob->getX()) + (m_Y - mob->getY()) * (m_Y - mob->getY()) < (getStats()->getRange() * getStats()->getRange());
+}
+
 const std::map<std::pair<TowerType, TowerLevel>, TowerStats> TowerConstants = {
     //                                    // rate  damage range
     {{TowerType::Archer, {1, TowerPath::Top}}, {2, 5, 10}},
@@ -161,7 +167,28 @@ TowerPtr createTower(TowerType type, TowerID id, std::int32_t x, std::int32_t y,
 
 
 void ArcherTower::tick(std::uint64_t delta, World* world) {
+    if (m_Timer.update(delta)) {
+        std::uint8_t arrowsShot = 0;
+        bool explosiveArrows = getLevel().getPath() == TowerPath::Bottom;
+        std::uint8_t arrows = explosiveArrows ? 2 : getLevel().getLevel();
+        for (MobPtr mob : world->getMobList()) {
+            if (isMobInRange(mob)) {
+                shootArrow(mob);
+                arrowsShot++;
+                if(arrowsShot >= arrows)
+                    break;
+            }
+        }
+    }
+}
 
+void ArcherTower::shootArrow(MobPtr target){
+    bool explosiveArrows = getLevel().getPath() == TowerPath::Bottom;
+    if(explosiveArrows){
+
+    }else{
+        target->damage(getStats()->getDamage());
+    }
 }
 
 void IceTower::tick(std::uint64_t delta, World* world) {
diff --git a/src/game/World.cpp b/src/game/World.cpp
index a9e8f1e..2edcc1b 100644
--- a/src/game/World.cpp
+++ b/src/game/World.cpp
@@ -322,8 +322,9 @@ bool World::saveMap(const std::string& fileName) const {
 void World::tick(std::uint64_t delta) {
     moveMobs(delta);
     for(TowerPtr tower : m_Towers){
-        tower->tick(delta);
+        tower->tick(delta, this);
     }
+    cleanDeadMobs();
 }
 
 void World::spawnMobAt(MobID id, MobType type, std::uint8_t level, PlayerID sender, float x, float y, Direction dir) {
@@ -447,6 +448,15 @@ bool World::CanPlaceBigTower(const glm::vec2& worldPos, PlayerID playerID) const
     return false;
 }
 
+void World::cleanDeadMobs(){
+    for(auto it = m_Mobs.begin(); it != m_Mobs.end(); it++){
+        MobPtr mob = *it;
+        if(!mob->isAlive()){
+            m_Mobs.erase(it);
+        }
+    }
+}
+
 Team& World::getRedTeam() {
     return m_Game->getRedTeam();
 }
diff --git a/src/misc/Time.cpp b/src/misc/Time.cpp
index b2b0c4b..0b5f2a5 100644
--- a/src/misc/Time.cpp
+++ b/src/misc/Time.cpp
@@ -4,7 +4,7 @@
 namespace td {
 namespace utils {
 
-void Timer::update() {
+void AutoTimer::update() {
     m_InternalTime += getTime() - m_LastTime;
     if (m_InternalTime >= m_Interval) {
         if (m_Function != nullptr)
@@ -14,7 +14,7 @@ void Timer::update() {
     m_LastTime = getTime();
 }
 
-void Timer::update(std::uint64_t delta) {
+void AutoTimer::update(std::uint64_t delta) {
     m_InternalTime += delta;
     if (m_InternalTime >= m_Interval) {
         if (m_Function != nullptr)
@@ -24,11 +24,24 @@ void Timer::update(std::uint64_t delta) {
     m_LastTime = getTime();
 }
 
-void Timer::reset() {
+void AutoTimer::reset() {
     m_InternalTime = 0;
     m_LastTime = getTime();
 }
 
+bool Timer::update(std::uint64_t delta){
+    m_InternalTime += delta;
+    if (m_InternalTime >= m_Interval) {
+        m_InternalTime %= m_Interval;
+        return true;
+    }
+    return false;
+}
+
+void Timer::reset(){
+    m_InternalTime = 0;
+}
+
 std::uint64_t getTime() {
     return std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock().now().time_since_epoch()).count();
 }