[SUGGESTION] Teeworld Anticheat System.

It has been talked to death already.

Your solution wouldn't work for all cases (good players with aimbot vs pro players without) and would imply a lot of management from the parties involved. Plus make the game complicated.

I believe we can add a reputation system when we have accounts. Before that, it's meaningless because most IPs are dynamic and we can't match on a given player efficiently.

Finally, be careful when you start to think people are using aimbots. For one, I am getting tired of being accused daily wherever I go, even sometimes on servers of so-called pro level. Some people simply have a nearly perfect aim (with laser it's just a matter of shooting straight if your ping is below 60, above you have to account for the slight delay).

Easy steps to see if someone is using an aimbot:
- really good moves often come with a good aim. Bots don't make anyone move better.
- spinning the cursor (or simply "spinning") is not something bots do, experienced and wannabe players do it (you can distinguish pro from wannabe by the fact that their spinning is actually helping their moves rather than hindering them).
- look at the ping, perfect laser rifle aim with 100+ ping is difficult without a bot (other weapons are ok)
- look at the ability to hook ... a good hook comes with a good aim, but also the ability to take the upperhand once you've been hooked...
- aimbots don't do laser bounces on purpose
- and most of all, aimbots never fail a straight shot from outside the static camera view (unless there's an object in the middle), which doesn't mean that honest players can't do the same with dynamic camera or simply by smart-guessing and a good timing evaluating the opponent's speed and likely course of action.
- for some aimbots, the tag [bot] gets added to the nickname, then don't hesitate to ban.

In most cases, only low to mid level players ever use aimbots.

Also, bots are mostly in instagib-based gametypes. So try to play another gametype.

There are MANY false positives. You shouldn't assume someone is an aimbot simply because he's incredibly good. If you see someone really good, he's probably not using a aimbot even if he hits 90% of the time. It's frustrating, but he's probably just very good.

There is a thread with complementary details on how to recognize aimbots here:
http://www.teeworlds.com/forum/viewtopic.php?id=3033

PS: teeworlds already support demos recording

If this anticheat system should be opensource, this function can be misused.

Many majors ISPs have an IP pool distributed over many subnets, this will not work and will only ban innocent players. I know firsthand because I have no problem banning very large on my servers (and thus having a lot of collateral damage), but doing this as the standard, out-of-the-box solution will not work. You simply can't use the IP for large scale moderation, but a web of trust (what you are describing, which btw is a topic I am fairly knowledgeable on) + an account system could mitigate the problem a lot. It is still a lot of work to put in place.

The thing is that people will never be satisfied with the official, trusted answer. If they feel someone is cheating, even if he's been cleared by the trust system, they will still feel unhappy and try to kick him out. Even without kicking, it is tiresome to be accused of cheating after an extraordinary in-game action and it ruins a lot of fun. Many (often young) people simply can't take the fact that some people are way better than they are.

Most cheaters are recognizable immediately because there is a huge gap between their moves and their aim, because their attitude scream of their usage of cheats. Any regular player can spot them very quickly. The only problem is the good players who might use cheats and who are smart about it, but I think they're very few because cheating if you're already good is not fun at all, and at this level players play for their ego / to be the best: cheating doesn't give any feeling of accomplishment.

Cheaters are a pain on random servers though, but if you play on actively moderated ones, or servers with a lot of good players who can votekick fast, it's ok. I won't say there are no cheaters because there are, and I viscerally despise them, but that's just a bunch of sad kids who try to make up for their lack of skill.

So, the official answer is:
- we have plans for an account system, maybe reputation can play a role in it.
- don't expect anything soon
- there is too much paranoia about cheaters, it is still marginal on decent servers
- if you're on a server where you can't get a bot kicked, find another server with people with an active brain

I could think of a server-side bot detection approach. If you analyze the player's aiming behavior and compare it to patterns of known aimbots (using some fancy statistical analysis), you could probably determine with a good certainty if somebody is cheating. And it would be server-side, which is very important for a game like Teeworlds.

Of course, people could slightly alter their aimbot just enough to get away with it. But this method would at least catch a certain percentage of cheaters. It will never be possible to catch each and every cheater, but that should not be a reason for not trying anything.

Really? Is this a custom modification or is it part of the official code? I'd like to see it.