Girlfriend dumped me but said i still like you.

A chance at what? I think you've got a chance at a casual fling, not at a relationship.

play her game... make some strategy.

Most people will say to not contact her... I also say this only if you answer "no" to these questions.

If you two remain friends and she got another BF, would you be jealous?
If you knew there was absolutely no chance for you to get back together, would you still want to be her friend?

I doubt you could say to (honestly) to both of those questions,