diff --git a/src/main/java/cactusServer/models/CollisionManager.java b/src/main/java/cactusServer/models/CollisionManager.java
index 9a3df16..48a4f5d 100644
--- a/src/main/java/cactusServer/models/CollisionManager.java
+++ b/src/main/java/cactusServer/models/CollisionManager.java
@@ -45,7 +45,7 @@
 			Instance instance = Instances.getInstance().getInstance(instanceId);
 			instance.getUniverse().update(interval);
 			collisionPlayersObjects(instanceId, instance);
-//			collisionBulletsAndOthers(instanceId, instance);
+			collisionBulletsAndOthers(instanceId, instance);
 		}
 	}
 
@@ -92,80 +92,63 @@
 		vec.add(result.normal);
 		object.setPosition(new Position3D(vec));
 	}
-	
-//	private void collisionBulletsAndOthers(String instanceId, Instance instance) {
-//		System.out.println("a");
-//		for (Map.Entry<String, HashMap<String, Bullet>> playersBulletsEntry : instance.getBullets().entrySet()) {
-//			String bulletOwnerPlayerId = playersBulletsEntry.getKey();
-//			Map<String, Bullet> bulletMap = playersBulletsEntry.getValue();
-//			for (Map.Entry<String, Bullet> bulletEntry : bulletMap.entrySet()) {
-//				String bulletId = bulletEntry.getKey();
-//				Bullet bullet = bulletEntry.getValue();
-//				System.out.println("b");
-//				collisionBulletAndPlayers(instanceId, instance, bulletOwnerPlayerId, bulletId, bullet);
-//				System.out.println("c");
-//				collisionBulletAndObjects(instance, bulletOwnerPlayerId, bulletId, bullet);
-//				System.out.println("d");
-//			}
-//		}
-//	}
-	
+
 	private void collisionBulletsAndOthers(String instanceId, Instance instance) {
-		System.out.println("a");
-//		for (Map.Entry<String, HashMap<String, Bullet>> playersBulletsEntry : instance.getBullets().entrySet()) {
 		Iterator<Map.Entry<String, HashMap<String, Bullet>>> playersBulletsEntryIt = instance.getBullets().entrySet().iterator();
 		while (playersBulletsEntryIt.hasNext()) {
 			Map.Entry<String, HashMap<String, Bullet>> playersBulletsEntry = playersBulletsEntryIt.next();
 			String bulletOwnerPlayerId = playersBulletsEntry.getKey();
 			Map<String, Bullet> bulletMap = playersBulletsEntry.getValue();
-//			for (Map.Entry<String, Bullet> bulletEntry : bulletMap.entrySet()) {
 			Iterator<Map.Entry<String, Bullet>> bulletEntryIt = bulletMap.entrySet().iterator();
 			while (bulletEntryIt.hasNext()) {
 				Map.Entry<String, Bullet> bulletEntry = bulletEntryIt.next();
 				String bulletId = bulletEntry.getKey();
 				Bullet bullet = bulletEntry.getValue();
-				System.out.println("b");
-				collisionBulletAndPlayers(instanceId, instance, bulletOwnerPlayerId, bulletId, bullet, bulletEntryIt);
-				System.out.println("c");
-				collisionBulletAndObjects(instance, bulletOwnerPlayerId, bulletId, bullet, bulletEntryIt);
-				System.out.println("d");
+				boolean isRemoved = collisionBulletAndPlayers(instanceId, instance, bulletOwnerPlayerId, bulletId, bullet, bulletEntryIt);
+				if (!isRemoved) {
+					collisionBulletAndObjects(instance, bulletOwnerPlayerId, bulletId, bullet, bulletEntryIt);
+				}
 			}
 		}
 	}
-	
-	private void collisionBulletAndPlayers(String instanceId, Instance instance, String bulletOwnerPlayerId, String bulletId, Bullet bullet, Iterator<Map.Entry<String, Bullet>> bulletEntryIt) {
+
+	private boolean collisionBulletAndPlayers(String instanceId, Instance instance, String bulletOwnerPlayerId,
+			String bulletId, Bullet bullet, Iterator<Map.Entry<String, Bullet>> bulletEntryIt) {
 		Instances instances = Instances.getInstance();
 		for (Map.Entry<String, Player> playersEntry : instances.getPlayers(instanceId).entrySet()) {
 			if (isCollision(bullet, playersEntry.getValue())) {
 				if (!(playersEntry.getKey().equals(bulletOwnerPlayerId))) {
 					// Player(����������)�ƒe�������������̏���������
 				}
-//				instance.destroyBullet(bulletOwnerPlayerId, bulletId); // Player(�������܂�)�ɓ��������e������
-				bulletEntryIt.remove();
-				instance.getUniverse().displace(bullet.getPlaceable());
+				// Player(�������܂�)�ɓ��������e������
+//				bulletEntryIt.remove(); 
+//				instance.getUniverse().displace(bullet.getPlaceable());
+//				System.out.println(bulletId + "�폜");
+				return true;
 			}
 		}
+		return false;
 	}
-	
-	private void collisionBulletAndObjects(Instance instance, String bulletOwnerPlayerId, String bulletId, Bullet bullet, Iterator<Map.Entry<String, Bullet>> bulletEntryIt) {
-		System.out.println("c1");
+
+	private boolean collisionBulletAndObjects(Instance instance, String bulletOwnerPlayerId, String bulletId,
+			Bullet bullet, Iterator<Map.Entry<String, Bullet>> bulletEntryIt) {
 		for (MovableObject object : instance.getObjects().values()) {
 			if (isCollision(bullet, object)) {
-				System.out.println("c2");
-//				instance.destroyBullet(bulletOwnerPlayerId, bulletId);
-				bulletEntryIt.remove();
-				instance.getUniverse().displace(bullet.getPlaceable());
-				System.out.println("c3");
+//				bulletEntryIt.remove();
+//				instance.getUniverse().displace(bullet.getPlaceable());
+//				System.out.println(bulletId + "�폜");
+//				return true;
 			}
 		}
+		return false;
 	}
-	
+
 	private boolean isCollision(Bullet bullet, Player player) {
 		CollisionResult result;
 		result = PhysicsUtility.checkCollision((Object3D) (bullet.getPlaceable()), null, player.getObject(), null);
 		return (result != null);
 	}
-	
+
 	private boolean isCollision(Bullet bullet, MovableObject object) {
 		CollisionResult result;
 		result = PhysicsUtility.checkCollision((Object3D) (bullet.getPlaceable()), null, object.getObject(), null);