open source ready game + customization and database

We need an open source ready game with some of our customization and sync it with a database to put a ranking system of players , we are launching a new website, we want to do a landing page till we launch our website, The landing page will let visitors play a game and challenge each others to get high rank in order to win with us at the end of the competition. The landing page will include the game ,coming soon , and the ranking players list and for sure a countdown till we launch the website. The user before he play the game , he must enter a nickname with his email address then play and submit his level at the end. And time took him to finish it. So the ranking system will be based on time and the level. Message us to give you more details