You can gleam the info from that...
quite bluntly the scores are sent like this:
url/proarcade.php?action=<actionname>&game=<gamename>& <scorevarname>=<scorevalue>
ie to give yourself 33,500 in tetris:
http://www.myforum.com/proarcade.php?action=gameover&game=tetris&tetrissc ore=33,500
From that you can see pretty much how the games are sending the score back to proarcade.php. I wouldn't be posting this except for the fact that I've had everyone putting in fake scores all day.

I had one user who even told me he actually recompiled the breakout .swf and changed the breakoutscore = score; line to read a static value and the location variable to match the url to our forum, and then all he had to do was run it and presto.
There must be some way to prevent both of the above from happening.