diff --git a/battlecode25/engine/game/constants.py b/battlecode25/engine/game/constants.py
index d181a25..665842f 100644
--- a/battlecode25/engine/game/constants.py
+++ b/battlecode25/engine/game/constants.py
@@ -79,6 +79,9 @@ class GameConstants:
     # The maximum turns a robot can have 0 paint before it dies.
     MAX_TURNS_WITHOUT_PAINT = 10
 
+    # Moppers face greater enemy territory paint penalties than other robots by this factor
+    MOPPER_PAINT_PENALTY_MULTIPLIER = 2
+
     # *****************************
     # ****** GAME MECHANICS *******
     # *****************************
diff --git a/battlecode25/engine/game/game_fb.py b/battlecode25/engine/game/game_fb.py
index 4584f1f..fab57c7 100644
--- a/battlecode25/engine/game/game_fb.py
+++ b/battlecode25/engine/game/game_fb.py
@@ -305,6 +305,16 @@ def add_die_action(self, id, was_exception):
         self.current_actions.append(action_offset)
         self.current_action_types.append(Action.Action().DieAction)
 
+    def add_remove_paint_action(self, affected_robot_id, paint):
+        action_offset = DamageAction.CreateDamageAction(self.builder, affected_robot_id, paint)
+        self.current_actions.append(action_offset)
+        self.current_actions.append(Action.Action().DamageAction)
+
+    def add_complete_resource_pattern_action(self, loc):
+        action_offset = TransferAction.CreateTransferAction(self.builder, self.initial_map.loc_to_index(loc), 0)
+        self.current_actions.append(action_offset)
+        self.current_actions.append(Action.Action().TransferAction)
+
     def add_team_info(self, team, money_amount, coverage_amount, resource_patterns):
         self.team_ids.append(fb_from_team(team))
         self.team_money.append(money_amount)
diff --git a/battlecode25/engine/game/robot.py b/battlecode25/engine/game/robot.py
index 59c3322..3feb01f 100644
--- a/battlecode25/engine/game/robot.py
+++ b/battlecode25/engine/game/robot.py
@@ -108,12 +108,13 @@ def process_end_of_turn(self):
         paint_status = self.game.paint[loc_idx]
 
         if self.type.is_robot_type():
+            multiplier = GameConstants.MOPPER_PAINT_PENALTY_MULTIPLIER if self.type == UnitType.MOPPER else 1
             if self.game.team_from_paint(paint_status) == self.team:
                 paint_penalty = 0
             elif self.game.team_from_paint(paint_status) == Team.NEUTRAL:
-                paint_penalty = GameConstants.PENALTY_NEUTRAL_TERRITORY
+                paint_penalty = GameConstants.PENALTY_NEUTRAL_TERRITORY * multiplier
             else:
-                paint_penalty = GameConstants.PENALTY_ENEMY_TERRITORY
+                paint_penalty = GameConstants.PENALTY_ENEMY_TERRITORY * multiplier
                 count = 0
                 for adj_loc in self.game.get_all_locations_within_radius_squared(self.loc, 2):
                     adj_robot = self.game.get_robot(adj_loc)
diff --git a/battlecode25/engine/game/robot_controller.py b/battlecode25/engine/game/robot_controller.py
index cbd534c..ee6dc3e 100644
--- a/battlecode25/engine/game/robot_controller.py
+++ b/battlecode25/engine/game/robot_controller.py
@@ -349,6 +349,7 @@ def attack(self, loc: MapLocation, use_secondary_color: bool=False) -> None:
                 target_robot = self.game.get_robot(loc)
                 if target_robot and target_robot.type.is_robot_type() and target_robot.team != self.robot.team:
                     target_robot.add_paint(-GameConstants.MOPPER_ATTACK_PAINT_DEPLETION)
+                    self.game.game_fb.add_remove_paint_action(target_robot.id, GameConstants.MOPPER_ATTACK_PAINT_DEPLETION)
                     self.robot.add_paint(GameConstants.MOPPER_ATTACK_PAINT_ADDITION)
                     self.game.game_fb.add_attack_action(target_robot.id)                    
                 
@@ -415,6 +416,7 @@ def mop_swing(self, dir: Direction) -> None:
             target_robot = self.game.get_robot(new_loc)
             if target_robot and target_robot.team != self.robot.team:
                 target_robot.add_paint(-GameConstants.MOPPER_SWING_PAINT_DEPLETION)
+                self.game.game_fb.add_remove_paint_action(target_robot.id, GameConstants.MOPPER_SWING_PAINT_DEPLETION)
                 target_ids.append(target_robot.id)
             else:
                 target_ids.append(0)
@@ -486,6 +488,8 @@ def mark_resource_pattern(self, loc: MapLocation) -> None:
     def assert_can_mark(self, loc: MapLocation) -> None:
         self.assert_is_robot_type(self.robot.type)
         self.assert_can_act_location(loc, GameConstants.MARK_RADIUS_SQUARED)
+        if not self.game.is_passable(loc):
+            raise RobotError("Cannot mark a square that is not paintable.")
 
     def can_mark(self, loc: MapLocation) -> bool:
         try:
@@ -572,6 +576,7 @@ def can_complete_resource_pattern(self, loc: MapLocation) -> bool:
     def complete_resource_pattern(self, loc: MapLocation) -> None:
         self.assert_can_complete_resource_pattern(loc)
         self.game.complete_resource_pattern(self.robot.team, loc)
+        self.game.game_fb.add_complete_resource_pattern_action(loc)
            
     # BUILDING FUNCTIONS