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I have the applet running locally, and I can send all the needed packages to the server, but for some reason, when I edit the score, the server wont add the score. I see there is a section on the highscores which tell that the player cheated, but I cannot get a score even with that. Unedited score goes just fine. Could you tell what kind of cheating checking is at the server? I think it atleast checks the length of the snake, but does it also check the time of the game, because I cannot post score with the same parameters as the first player.

If there is any checking on the server, then that's part of the challenge, wouldn't you think? In any case, all information you need is in the applet.