diff --git a/main.py b/main.py
index c0c978b..7d11f24 100644
--- a/main.py
+++ b/main.py
@@ -13,6 +13,7 @@ class GestureSuit(Enum):
 
 
 class GameMode(Enum):
+    KILL = "kill"
     TRANSFORM = "transform"
 
 
@@ -43,6 +44,10 @@ def __gt__(self, other: Self):
     def equals(self, other: Self):
         return self.suit == other.suit
 
+    def kill(self):
+        self.alive = False
+        self.cell = None
+
     def transform(self, suit: GestureSuit):
         self.suit = suit
 
@@ -78,6 +83,18 @@ def remove_gesture(self):
         self.gesture.cell = None
         self.gesture = None
 
+    def _challenge_kill(self, incoming: Gesture):
+        incoming.cell.remove_gesture()
+
+        if self.gesture > incoming:
+            incoming.kill()
+            self.stats[f"remaining_{incoming.suit.value}"] -= 1
+
+        else:
+            self.gesture.kill()
+            self.stats[f"remaining_{self.gesture.suit.value}"] -= 1
+            self._assign_gesture(incoming)
+
     def _challenge_transform(self, incoming: Gesture):
         if self.gesture > incoming:
             self.stats[f"remaining_{incoming.suit.value}"] -= 1
@@ -197,12 +214,20 @@ def _move_gesture(self, gesture: Gesture):
         new_cell = random.choice(surrounding_cells)
         new_cell.run_challenge(gesture)
 
+    def _remove_not_alive_gestures(self):
+        self.gestures = [g for g in self.gestures if g.alive]
+
     def _move_gestures(self):
         random.shuffle(self.gestures)
 
         for gesture in self.gestures:
+            # gesture objs can become not alive while in this loop
+            if not gesture.alive:
+                continue
             self._move_gesture(gesture)
 
+        self._remove_not_alive_gestures()
+
     def _play_round(self):
         self.stats["round_number"] += 1
 
diff --git a/tests.py b/tests.py
index d8e9568..7548d1f 100644
--- a/tests.py
+++ b/tests.py
@@ -40,6 +40,15 @@ def test_equals(self):
             g2 = Gesture(gs)
             self.assertTrue(g1.equals(g2))
 
+    def test_kill(self):
+        g = Gesture(GestureSuit.ROCK)
+        g.cell = Cell(MagicMock())
+
+        g.kill()
+
+        self.assertFalse(g.alive)
+        self.assertIsNone(g.cell)
+
     def test_transform(self):
         g = Gesture(GestureSuit.ROCK)
         g.transform(GestureSuit.PAPER)
@@ -95,6 +104,7 @@ def test_remove_gesture(self):
 
     @parameterized.expand([
         ("_challenge_transform", GameMode.TRANSFORM),
+        ("_challenge_kill", GameMode.KILL),
     ])
     def test_get_challenge_function(self, function_name, mode):
         game = MagicMock(GAME_MODE=mode)
@@ -369,11 +379,27 @@ def test_move_gesture_no_available_cells(self, _get_available_cells_to_move_to,
         _get_available_cells_to_move_to.assert_called_once_with(gesture)
         self.assertFalse(run_challenge.called)
 
+    def test_remove_not_alive_gestures(self):
+        game = RockPaperScissor()
+
+        gesture = game.gestures[5]
+        gesture.kill()
+
+        game._remove_not_alive_gestures()
+        self.assertNotIn(gesture, game.gestures)
+
+    @patch.object(RockPaperScissor, "_remove_not_alive_gestures")
     @patch.object(RockPaperScissor, "_move_gesture")
-    def test_move_gestures(self, _move_gesture):
+    def test_move_gestures(self, _move_gesture, _remove_not_alive_gestures):
         game = RockPaperScissor()
+
+        gesture = game.gestures[5]
+        gesture.kill()
+
         game._move_gestures()
-        self.assertEqual(len(game.gestures), len(_move_gesture.call_args_list))
+        self.assertFalse(call(gesture) in _move_gesture.call_args_list)
+
+        _remove_not_alive_gestures.assert_called()
 
     @patch.object(RockPaperScissor, "_move_gestures")
     @patch.object(RockPaperScissor, "_print_board")