I will not waste your time is introduction. Here is a small tutorial on how you can do it.
1.  Download a Mozilla Firefox addon called Tamper Data
You can download it from here:
https://addons.mozilla.org/en-US/firefox/addon/966
2.   Find a game you want with ability to submit your score.
3.   Before you start the game, start the Temper Data addon by going on Tools -> Tamper Data -> Start Tamper
4.   Now, start the game, get some score, and then, lets say, lose. Now select to submit the score. Then Temper Data should appear, and select button Tamper, and in the right part of the window you should find a string of commands that game has set to browser.
5.  You should find the word SCORE and the number that should be next to it. Change that number as you wish. Then click submit in the Tamper Data and you should get the score you wanted.
There is no point in cheating especially in online games, but it is interesting to know you can did it, and the fun is in learning how to do it…
Tags: cheating online games, cheats, firefox, flash games, Games, online, online games, submit your score, temper data, united states
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Sounds like a true winner
. Nice share. Stumbled.
Pratyushs last blog post..15 must-have Firefox tricks
THANK GOD. NOW EVERYONE WILL FINLY THINK DAT I AM THE BESTEST AT FLASH 3D PING PONG. MY LIFE IS COMPLETE.
I’m with anon ^
I’m glad to know that I can did it.
Tamper data is a fantastic addon for security researchers / technicians. It is by far the quickest and easiest way to mess around with submitted form values.
I could tamper with this very comment form right now. For instance, I can see a hidden parameter named redirect_to with the contents “/index.php/2008/08/03/how-to-cheat-on-online-flash-games/” which is (presumably) where I will end up after hitting “submit”.
I wonder what would happen if I changed that to “yahoo.com”…
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Dear sir,
If there is high score in flash file, and there is no submit button in the game and it submits score automatically when you game over then , tamper doesnot work and this is not possible to make highscore rank through tamper tool if game automatically submit the hiscore, please tell me if there is another way to do this.
Hey one cheat for money please
how to cheat???
thanks for the info!!! works for me.
way to go!!
it works
Thanks I hope this works, I just want to get back at people who cheated on the online games.
this doesnt work on a flash based game that is an application and a sever sided game? any ideas there is virtual money and i want to have more on the game
please help me. how to change my score in this game http://www.fruital.com/fanta/
please ANSWER me in mokdad@hotmail.fr
Thanks very much,it works very very good.