Flash games hack, score is 49700?? How to improve flash games security?

Question

I have 2 flash games (written in as3). Both the highscore value being hacked. The normal range of each game score is not more than 5000 (normal users, will only get 2000 - 3000

Answer 1

What I was thinking was that since the game appear's to require authentication I would assume that there are calls that require a get user name and other info.

Discussing the matter from another developer thir advice was to use Ajax components. Idk.

Most hackers will find a way to get around most security issues the best way is to prevent them from sending anything back to the server other than what is required for the game to function.

Has anyone used random based on the amount of negative memory available? instead of looking for the specific memory location with those softwares.

Why not send multiple bogus values to mem and derive the outcomes based on open memory locations?

Please don't attack me for this suggestion I am a learner like most others.