diff --git a/server/gameserver/metadata.cc b/server/gameserver/metadata.cc
index 40a19dc..25aa794 100644
--- a/server/gameserver/metadata.cc
+++ b/server/gameserver/metadata.cc
@@ -170,6 +170,17 @@ namespace MetaData
                 a8::SetBitFlag(receive_special_damage_type, n);
             }
         }
+        {
+            std::vector<std::string> strings;
+            a8::Split(i->sweep_tags(), strings, '|');
+            for (auto& str : strings) {
+                int n = a8::XValue(str);
+                if (n <= 0 || n > 63) {
+                    abort();
+                }
+                a8::SetBitFlag(sweep_tags, n);
+            }
+        }
         {
             int_param1 = a8::XValue(i->param1());
             float_param1 = a8::XValue(i->param1()).GetDouble();
diff --git a/server/gameserver/metadata.h b/server/gameserver/metadata.h
index a249e19..4302657 100644
--- a/server/gameserver/metadata.h
+++ b/server/gameserver/metadata.h
@@ -53,6 +53,7 @@ namespace MetaData
 	float float_param1 = 0;
         int int_param2 = 0;
 	float float_param2 = 0;
+        long long sweep_tags = 0;
 
         void Init();
     };
diff --git a/server/gameserver/room.h b/server/gameserver/room.h
index 8172fe8..2b2cf0c 100644
--- a/server/gameserver/room.h
+++ b/server/gameserver/room.h
@@ -52,6 +52,7 @@ public:
     bool debug_trace = false;
     bool added_to_over_room = false;
     a8::Vec2 last_player_jump_pos;
+    std::map<int, RoomObstacleWeakPtr> mine_objects;
 
     ~Room();
     void InitData(RoomInitInfo& init_info);
diff --git a/server/gameserver/roomobstacle.cc b/server/gameserver/roomobstacle.cc
index 91b580a..b5d9cf6 100644
--- a/server/gameserver/roomobstacle.cc
+++ b/server/gameserver/roomobstacle.cc
@@ -45,12 +45,18 @@ RoomObstacle::~RoomObstacle()
     if (!hit_objects_) {
         A8_SAFE_DELETE(hit_objects_);
     }
+    if (meta->sweep_tags != 0) {
+        room->mine_objects.erase(GetUniId());
+    }
 }
 
 void RoomObstacle::Initialize()
 {
     Obstacle::Initialize();
     xtimer_attacher.xtimer = &room->xtimer;
+    if (meta->sweep_tags != 0) {
+        room->mine_objects[GetUniId()] = GetWeakPtrRef();
+    }
 }
 
 void RoomObstacle::RecalcSelfCollider()
diff --git a/server/tools/protobuild/metatable.proto b/server/tools/protobuild/metatable.proto
index f391f3b..bd9609f 100755
--- a/server/tools/protobuild/metatable.proto
+++ b/server/tools/protobuild/metatable.proto
@@ -71,6 +71,7 @@ message MapThing
     optional int32 bullet_hit = 28;
     optional int32 collision_hit = 29;
     optional int32 explosion_hit = 30;
+    optional string sweep_tags = 31;
 }
 
 message SafeArea