Legality of memory editing flash games?

Without having researched this, and with the express disclaimer that this is not legal advice and my only advice is that if you want legal advice, you should contact an IP or internet lawyer, here is my gut reaction:

Unauthorized accessing of a server is illegal. Implicitly, the authors of the game are giving people permission to access their servers for the purpose of submitting scores from legitimate game plays. By submitting a score from an illigitimate game play, even if the alteration was done on your machine and the submission was done through their authorized system, you have still accessed their server outside of the confines of their clear intent to allow you to do so and hence you have committed a crime.

If you're using the memory editor to steal people's money, it's likely fraud in any State. They agreed (and this is probably illegal anyway since it's gambling) to bet against you head to head to see who can get the highest score. What you're doing here is no different from cheating in a poker game, which is illegal.

Again, I haven't researched the crime of unauthorized accessing of a server and I do not know the elements. I believe it is a federal offense in the United States, but I'm not sure. It might be against State law and then you have a fairly complex jurisdictional question depending on where you are, where their server is, and possibly where players who have been injured are located, then a further question of whether or not injured pride is sufficient to consider other players injuries. So obviously, it gets more complex. But certainly, by submitting illegitimate scores, you have diminished the value of their high scoring system and cost them some, probably a very hard to calculate amount and perhaps quite small, but definitely some amount of money. And even without costing them money, it still may or may not constitute a crime.

I don't see why manipulating your machine's memory would ever be illegal, but if it was done to modify how an existing program works it might violate their terms of service. Most vendors will have a terms of service saying you can't mess with their data. Which brings me to another point, how could something edit the memory of another application? This is not normally allowed, and can only be accomplished by techniques like buffer overflows (which is hacking). The flash game designer most likely designed their game so that your client only works with the values the server provides, the server decides who is awarded points or gold and this process is controlled so that someone can't externally manipulate it.

I think you need a gamecube memory card.