Game design - How would you defeat Bots? So I've been thinking about the whole Bots issue in general and hoping someone can shed some light on the topic, since I rarely play MMO (never touched WoW) and am unfamiliar with what mechanics have been used to combat botting recently. Hypothetically, if you were to design D3 (or other MMO), how would you combat the Bot problem? Also, what are some of the best designs you've seen in combating Bots of the games you've played? From my limited exposure to MMO, it seems that the designs focus mostly on external (outside of the game world) checks, Ex. monitoring algorithms like Warden, idle kick, fast login kick...etc. But what of in-game checks disguised as part of the game? What I mean is common scenarios when you play the game that require "intelligent input", particularly for hell / Inferno, via combinations of monster skill combination, terrain ...etc that requires the human touch. Similar to the concept behind Captcha, but in this case, entertaining captcha with proper game world context. I suppose you could view them as mini-games designed to require intelligent input. Now I'm not saying use captcha directly and force it into a game where the context is all wrong, (imagine a captcha popping up when you reach a checkpoint...) but rather create entertaining scenarios or events in-game that requires the human touch. Just an (bad) example off the top of my head to illustrate what I mean: A magic circle trap triggers while you are crossing a hallway, trapping you in the circle and disabling your ability (no teleport or leap) while you are in it, to escape the trap you have to look for an opening on the edges of the circle, and there are 3 layers of magic circle (circle in a circle in a circle) with randomized or possibly roaming opening. If you don't make it out of the circle in a given amount of time bad things happen (Kick / MF+GF debuff / Death ...etc). Of course any such design must be able to defeat packet sniffing or it's equivalent in D3 (not sure if packet sniffing is still applicable in D3, but if it's possible to sniff what the correct response to a given scenario is...), but I don't think it's all that hard to implement various good "captchas" that fits into the game context (and hopefully entertaining, or at least not distracting) which can defeat most bots, or at least lower bot feasibility. Hell, throw in some interesting rewards for scoring well on these "captchas" should make me look forward to them.