@@ -237,19 +237,19 @@
 				return false;
 		return true;
 	}
 	
-	Tuple!(int,bool) command(char c)
+	Tuple!(int,bool) command(char c, int turn)
 	{
-		if(c=='R') return move( 0, +1);
-		if(c=='L') return move( 0, -1);
-		if(c=='U') return move(+1,  0);
-		if(c=='D') return move(-1,  0);
-		if(c=='W') return move( 0,  0);
+		if(c=='R') return move( 0, +1, turn);
+		if(c=='L') return move( 0, -1, turn);
+		if(c=='U') return move(+1,  0, turn);
+		if(c=='D') return move(-1,  0, turn);
+		if(c=='W') return move( 0,  0, turn);
 		assert(false);
 	}
 
-	Tuple!(int, bool) move(int dy, int dx)
+	Tuple!(int, bool) move(int dy, int dx, int turn)
 	{
 		int y = robot.y;
 		int x = robot.x;
 		assert( this[robot] == 'R' );
@@ -273,14 +273,14 @@
 				this[p] = ' ';
 			this[tp] = 'R';
 			robot = tp;
 		}
-		if( update() )
+		if( update(turn) )
 			dead = true;
 		return tuple(lambda,dead);
 	}
 
-	bool update()
+	bool update(int turn)
 	{
 		bool dead = false;
 
 		char[][] next;
@@ -320,8 +320,15 @@
 			else if(this[p]=='L') {
 				if(!lambda)
 					access(p) = 'O';
 			}
+			else if(this[p]=='W') {
+				if( hige.is_growing_turn(turn) )
+					for(int dy=-1; dy<=+1; ++dy)
+					for(int dx=-1; dx<=+1; ++dx)
+						if(this[p.y+dy,p.x+dx] == ' ')
+							access(new Pos(p.y+dy,p.x+dx)) = 'W';
+			}
 		}
 		data = next;
 		return dead;
 	}
@@ -388,9 +395,9 @@
 			return;
 		}
 
 		// TODO: clarify the event order
-		Tuple!(int,bool) ld = map.command(c);
+		Tuple!(int,bool) ld = map.command(c, turn);
 		if( map.cleared() ) {
 			exit_bonus = 2;
 		}
 		else {