Facebook Sports Prediction Instant Game

I want to launch a full-featured Facebook Instant Game that lets users predict football, cricket and basketball outcomes with virtual coins only. The build must run seamlessly inside Facebook, so the usual Instant Game constraints on size, loading time and HTML5 best practices apply... (Budget: £250 - £750 GBP, Jobs: Game Development, HTML5, iPhone, JavaScript, Mobile App Development, Node.js, PHP, PostgreSQL)