Automated Testing for game with Multisession/MultiUser /Virtual Users

For a game module which is normally played by multiple users across geographical location on different browsers needs. Before going Live I want to have automated tests written so it can mimic the situation for multiple users of one team and then multiple teams having multiple users playing at the same time. It should be scalable. Each test virtual users should be able to login and start the game and do voting in parallel. Test cases should mimic real life and produce report. A QA need to be done. The Test Suit should be good, reusable and easy to maintain as the software upgrades over time. A documentation should follow after the successful implementation. Some more insights of the test can be found in the attached file. Please propose if you are experienced and ready to deliver good quality. The proposal should be impressive showing your capabiliy and experience.