Betfair Exchange Games HI-Lo

I need to make exact analogical games of "Betfair Exchange Games HI-LO" ( _[login to view URL] ) with the same principles, same mathematics model and the slightly different graphic design. It must be possible to integrate fulfilled game on the already existing sites (Windows Server2008, IIS7,MSSQL), for this it is necessary to provide any communication to the data bases (such as users accounts) by means of web service or any API . The essential request is that the system has the possibility to process around 3000 concurrent users simultaneously and work without obstruction. (the site is supplied with corresponding server and hardware). Moreover, the essential request is the maximum stability of the system against hacker attack, and the compliance all nuances of security. Technologies: ASP.NET , C# , HTML, Javascript, JQuery, MSSQL, ActionScript, Flash, Flex (The Flash technology is not Required, but prefered ) I can provide you with detailed information regarding any question in case of interest. I would be grateful if only the specialists having experience in making similar games and are knowing BETFAIR Exchange-games contact me. The term and the quality of fulfillment has the decisive importance .