Likely by an Ajax post action ....
c2 vars: PlayerID, PlayerScore, TimePlayed,Code
Server post vars: id,playerscore,playertime,checkcode
In your data you will have something like "id="&PlayerID&"&playerscore="&PlayerScore&"&playertime="&TimePlayed&"&checkcode="&Code
You can encode bits as you like and need.
As for the server side, you will have to catch the post and store it somewhere.
Who dares wins