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Potholes in an automated multiplayer game where players can use their own algorithms

About tags

I noted this as Java and the question in C ++. This means that I am not looking for answers in specific languages. I just noted C ++ and Java, because I own them and, most likely, I will understand your code samples if they are written in these (or similar) languages.

What am I looking for?

Pointers and insight into security , I need to consider when developing software, mostly games such as described below. For security, I mean checking and double checking that the user is not acting in a way that is not intended. This may mean behavior such as sending his / her updated collection of the most malicious viruses existing on the server / other clients, or otherwise jeopardizing the user experience for other players, for example, by hacking.

Expected Comments and Responses

You ask how to stop people from hacking your game?

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package template

import snake.*;

public class TemplateLogic extends SnakeLogic {

    @Override
    public void onLaunch() {
    }

    @Override
    public String getMove() {
        return "UP";
    }

}

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