Narrow the Siege

The monsters ran away. They captured in the wizard's house, escaped in bubbles. You must catch them. It's simple. surround the monster, If you reduce the range it can move, the bubble will burst. Then the monster has no way to escape. You can catch it and lock it up. game is easy. If you touch the location, the wall will be built automatically. If the monster detects a wall is being erected, It will run away. Look out. Shall we set off to catch the monster now?