Alright. I'll try to explain this. You would need a bot that's kinda a packet editor that can detect where all the monsters are!. Aso. It would have to be able to detect if their on a higher level. If they are. It needs to know the packets of climbing a ladder and where to climb the ladder at and then have to still be able to follow the monster. Then it has to knwo the type of monster. It takes alot to make a bot like that and I don't think you'll find one for a 2D Side-Scrolling Game in your time.
